UCC2802QDRQ1全新原装原理图各脚功能电路原理芯片引脚定义-中国IC网-芯三七

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SGLS121B − JULY 2002 − REVISED 2004

D

Qualification in Accordance With

AEC-Q100

D

Operation to 1 MHz

Internal Soft Start

†

D

Qualified for Automotive Applications

Internal Fault Soft Start

D

Customer-Specific Configuration Control

Can Be Supported Along With

Major-Change Approval

Internal Leading-Edge Blanking of the

Current Sense Signal

D

1-Amp Totem-Pole Output

D

ESD Protection Exceeds 200 V Using

Machine Model (C = 200 pF, R = 0)

D

70-ns Typical Response from

Current-Sense to Gate Drive Output

100-µA Typical Starting Supply Current

500-µA Typical Operating Supply Current

D

1.5% Tolerance Voltage Reference

D

Same Pinout as UC3842 and UC3842A

†

Contact factory for details. Q100 qualification data available on

request.

description

The UCC2800/1/2/3/4/5 family of high-speed, low-power integrated circuits contain all of the control and drive

components required for off-line and dc-to-dc fixed frequency current-mode switching power supplies with

minimal parts count.

These devices have the same pin configuration as the UC2842/3/4/5 family and also offer the added features

of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.

The UCC2800/1/2/3/4/5 family offers choice of maximum duty cycle and critical voltage levels. Lower reference

parts such as the UCC2803 and UCC2805 fit best into battery operated systems, while the higher reference

and the higher UVLO hysteresis of the UCC2802 and UCC2804 make these ideal choices for use in off-line

power supplies.

The UCC280xQDRQ1 series is specified for the automotive temperature range of −40_C to 125_C, and

qualified in accordance with AEC-Q100 stress test qualification for integrated circuits.

PART NUMBER

UCC2800

UCC2801

UCC2802

UCC2803

UCC2804

UCC2805

MAXIMUM DUTY CYCLE REFERENCE VOLTAGE

TURN-ON THRESHOLD TURN-OFF THRESHOLD

100%

50%

5 V

4 V

5 V

4 V

7.2 V

9.4 V

12.5 V

4.1 V

12.5 V

4.1 V

6.9 V

7.4 V

8.3 V

3.6 V

8.3 V

3.6 V

100%

50%

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Copyright  2004, Texas Instruments Incorporated

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SGLS121B − JULY 2002 − REVISED 2004

block diagram

FB

2

COMP

1

CS

3

7

VCC

UCCx801

UCCx804

UCCx805

Only

Leading Edge

Blanking

VCC

OK

1.5 V

Overcurrent

REF/2

T Q

S Q

R

Oscillator

OUT

6

S Q

R

4 V

S Q

PWM

Latch

R

REF

OK

13.5 V

0.5 V

Full Cycle

Soft Start

Logic

Power

= 4 ms

1 V

GND

5

8

4

REF

RC

D PACKAGE

(TOP VIEW)

AVAILABLE OPTIONS

SOIC-8

COMP

FB

REF

1

2

3

4

8

7

6

5

SMALL OUTLINE

(D)

TA

V

CC

CS

OUT

GND

UCC2800QDRQ1

UCC2801QDRQ1

UCC2802QDRQ1

UCC2803QDRQ1

UCC2804QDRQ1

UCC2805QDRQ1

RC

−40_C to 125_C

†

The UCC280x−Q1 is only available taped and

reeled in quantities of 2500 devices per reel.

2

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ꢙ

SGLS121B − JULY 2002 − REVISED 2004

Ordering Information

80

0

Q

UCC2

D

R

Q1

Q100 INDICATOR

TAPE and REEL INDICATOR

PACKAGE

D

= Plastic SOIC

AUTOMOTIVE TEMPERATURE RANGE INDICATOR

PRODUCT OPTION

0 through 5

†‡

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

w

V

voltage

current

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA

CC

w

Output current, I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A

O

Output energy, (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 µJ

Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6.3 V

Power Dissipation at T < +25_C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.65 W

A

Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65_C to 150_C

stg

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . 300_C

†

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.

w In normal operation V

is powered through a current limiting resistor. Absolute maximum of 12 V applies when V is driven from a low

CC

impedance source such that I

does not exceed 30 mA (which includes gate drive current requirement).

CC

electrical characteristics T = −40_C to 125_C, V

= 10 V (see Note 1), RT = 100 kΩ from REF to

A

CC

RC, CT = 330 pF from RC to GND, 0.1-F capacitor from V

to GND, 0.1-F capacitor from V

to

CC

REF

GND and T = T (unless otherwise stated)

A

J

PARAMETER

Reference Section

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UCC2800/01/02/04

UCC2803/05

4.925

3.94

5

4

5.075

4.06

30

Output voltage

V

T = 25

_

C, I = 0.2 mA

I = 0.2 mA to 5 mA

J

Load regulation voltage

Line regulation voltage

10

mV

T = 25_C

1.9

J

V

CC

= 10 V to 12 V

mV/V

T = −40_C to 125_C

2.5

J

UCC2800/01/02/04

UCC2803/05

4.88

3.9

5

4

5.1

Total variation voltage

Output noise voltage

See Note 5

V

4.08

f = 10 Hz to 10 kHz,

See Note 7

T = 25_C

J

130

5

µV

1000 hours,

See Note 7

Long term stability

T

A

= 125_C

mV

mA

Output short-circuit current

−5

−35

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ꢙ

SGLS121B − JULY 2002 − REVISED 2004

electrical characteristics T = −40_C to 125_C, V

= 10 V (see Note 1), RT = 100 kΩ from REF to

A

CC

RC, CT = 330 pF from RC to GND, 0.1-F capacitor from V

to GND, 0.1-F capacitor from V

to

CC

REF

GND and T = T (unless otherwise stated)

A

J

PARAMETER

Oscillator Section

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UCC2800/01/02/04

40

46

52

Oscillator frequency

See Note 2

See Note 7

kHz

UCC2803/05

26

31

2.5

36

Temperature stability

%

V

Amplitude peak-to-peak

Oscillator peak voltage

Error Amplifier Section

2.25

2.4

2.55

2.45

V

COMP = 2.5 V

COMP = 2.0 V

UCC2800/01/02/04

UCC2803/05

2.44

1.95

−1

2.5

2

2.56

2.05

1

Input voltage

V

Input bias current

µA

db

Open loop voltage gain

COMP sink current

COMP source current

Gain bandwidth product

PWM Section

60

80

FB = 2.7 V,

FB = 1.8 V,

See Note 7

COMP = 1.1 V

COMP = REF − 1.2 V

0.3

3.5

mA

MHz

−0.2

−0.5

2

−0.8

UCC2800/02/03

97

48

99

49

100

50

0

Maximum duty cycle

%

UCC2801/04/05

Minimum duty cycle

Current Sense Section

Gain

COMP = 0 V

See Note 3

1.1

0.9

1.65

1

1.8

1.1

V/V

V

Maximum input signal

Input bias current

COMP = 5 V,

See Note 4

−200

50

200

150

1.68

1.35

nA

ns

V

CS blank time

100

1.55

0.9

Over-current threshold voltage

COMP to CS offset voltage

Output Section (OUT)

1.42

0.45

CS = 0 V

V

I

= 20 mA

All parts

0.1

0.35

0.15

0.7

0.15

1

0.4

0.9

0.4

1.2

0.4

1.9

0.9

70

OUT

= 200 mA

= 50 mA,

= 20 mA,

= −20 mA

= −200 mA

= −50 mA,

All parts

Low-level output voltage

V

= 5 V

= 0 V

UCC2803/05

All parts

CC

All parts

High-level output voltage V

(V - OUT)

SAT CC

V

= 5 V UCC2803/05

0.4

41

CC

Rise time

Fall time

C

= 1 nF

ns

L

= 1 nF

44

75

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ꢙ

SGLS121B − JULY 2002 − REVISED 2004

electrical characteristics T = −40_C to 125_C, V

= 10 V (see Note 1), RT = 100 kΩ from REF to

A

CC

RC, CT = 330 pF from RC to GND, 0.1-F capacitor from V

to GND, 0.1-F capacitor from V

to

CC

REF

GND and T = T (unless otherwise stated)

A

J

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout Section

UCC2800

6.6

7.2

7.8

UCC2801

8.6

11.5

3.7

9.4

12.5

4.1

6.9

7.4

8.3

3.6

0.3

2

10.2

13.5

4.5

7.5

8

Start threshold

See Note 6

V

UCC2802/04

UCC2803/05

UCC2800

6.3

UCC2801

6.8

Stop threshold

V

UCC2802/04

UCC2803/05

UCC2800

7.6

9

3.2

4

0.12

1.6

0.48

2.4

5.1

0.8

UCC2801

Start to stop hysteresis

V

UCC2802/04

UCC2803/05

3.5

4.2

0.5

0.2

Soft Start Section

COMP rise time

FB = 1.8 V,

Rise from 0.5 V to REF − 1 V

4

10

ms

Overall Section

Start-up current

V

< Start Threshold

0.1

0.5

0.2

1

mA

V

CC

FB = 0 V,

= 10 mA,

Operating supply current

CS = 0 V

V

internal zener voltage

I

See Notes 6 and 8

12

13.5

15

CC

internal zener voltage minus start

CC

See Note 6

UCC2802/04

0.5

1.0

V

threshold voltage

NOTES: 1. Adjust V

above the start threshold before setting at 10 V.

CC

2. Oscillator frequency for the UCC2800, UCC2802 and UCC2803 is the output frequency.

Oscillator frequency for the UCC2801, UCC2804 and UCC2805 is twice the output frequency.

3. Gain is defined by:

0 v V

v 0.8 V.

DV

CS

COMP

A =

DV

CS

4. Parameter measured at trip point of latch with pin 2 at 0 V.

5. Total variation includes temperature stability and load regulation.

6. Start threshold, stop threshold, and zener shunt thresholds track one another.

7. Not production tested.

8. The device is fully operating in clamp mode as the forcing current is higher than the normal operating supply current.

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SGLS121B − JULY 2002 − REVISED 2004

detailed terminal descriptions

COMP

COMP is the output of the error amplifier and the input of the PWM comparator.

Unlike other devices, the error amplifier in the UCC2800 family is a true, low output-impedance, 2-MHz

operational amplifier. As such, the COMP terminal can both source and sink current. However, the error

amplifier is internally current limited, so that one can command zero duty cycle by externally forcing COMP to

GND.

The UCC2800 family features built-in full cycle soft start. Soft start is implemented as a clamp on the maximum

COMP voltage.

CS

CS is the input to the current sense comparators. The UCC2800 family has two different current sense

comparators: the PWM comparator and an over-current comparator.

The UCC2800 family contains digital current sense filtering, which disconnects the CS terminal from the current

sense comparator during the 100 ns interval immediately following the rising edge of the OUT pin. This digital

filtering, also called leading-edge blanking, means that in most applications, no analog filtering (RC filter) is

required on CS. Compared to an external RC filter technique, the leading-edge blanking provides a smaller

effective CS to OUT propagation delay. Note, however, that the minimum non-zero on-time of the OUT signal

is directly affected by the leading-edge-blanking and the CS to OUT propagation delay.

The over-current comparator is only intended for fault sensing, and exceeding the over-current threshold

causes a soft start cycle.

FB

FB is the inverting input of the error amplifier. For best stability, keep the FB lead length as short as possible

and the FB stray capacitance as small as possible.

ground (GND)

GND is reference ground and power ground for all functions on this part.

OUT

OUT is the output of a high-current power driver capable of driving the gate of a power MOSFET with peak

currents exceeding "750 mA. OUT is actively held low when V

is below the UVLO threshold.

CC

The high-current power driver consists of FET output devices, which can switch all of the way to GND and all

of the way to V . The output stage also provides a low impedance to overshoot and undershoot. This means

CC

that in many cases, external Schottky clamp diodes are not required.

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ꢙ

SGLS121B − JULY 2002 − REVISED 2004

detailed descriptions (continued)

RC

RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by connecting

a resistor from REF to RC. Set frequency by connecting timing capacitor from RC to GND. For the best

perfomance, keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate

ground traces for the timing capacitor and all other functions.

The frequency of oscillation can be estimated with the following equations:

1.5

UCC2800ń01ń02ń04 : F +

R C

1.0

UCC2803ńUCC2805 : F +

R C

(1)

Where frequency is in Hz, resistance is in ohms, and capacitance is in farads. The recommended range of timing

resistors is between 10 kΩ and 200 kΩ and the timing capacitor is 100 pF to 1000 pF. Never use a timing resistor

less than 10 kΩ.

To prevent noise problems, bypass V

An electrolytic capacitor may also be used in addition to the ceramic capacitor.

to GND with a ceramic capacitor as close to the V

pin as possible.

CC

voltage reference (REF)

REF is the voltage reference for the error amplifier and also for many other functions on the IC. REF is also used

as the logic power supply for high speed switching logic on the IC.

When V is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5-kΩ resistor.

CC

This means that REF can be used as a logic output indicating power system status. It is important for reference

stability that REF is bypassed to GND with a ceramic capacitor as close to the pin as possible. An electrolytic

capacitor may also be used in addition to the ceramic capacitor. A minimum of 0.1-µF ceramic is required.

Additional REF bypassing is required for external loads greater than 2.5 mA on the reference.

To prevent noise problems with high speed switching transients, bypass REF to ground with a ceramic capacitor

close to the IC package.

power (V

)

CC

V

is the power input connection for this device. In normal operation V

is powered through a current limiting

CC

resistor. Although quiescent V

Total V

frequency and the MOSFET gate charge (Q ), average OUT current can be calculated from:

current is low, total supply current will be higher, depending on OUT current.

CC

current is the sum of quiescent V

current and the average OUT current. Knowing the operating

CC

g

I_OUT+ Q_g F.

(2)

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ꢌ ꢍꢎꢊꢏ ꢍꢎꢐꢑ ꢒꢓ ꢁ ꢔꢍꢕ ꢁꢀ ꢑꢑ ꢐꢖꢗꢊꢔꢍ ꢘ ꢐ ꢏꢎ ꢔ

ꢙ

SGLS121B − JULY 2002 − REVISED 2004

PARAMETER MEASUREMENT INFORMATION

Error Amplifier

Gain/Phase Response

Oscillator

0.2 V

REF

8

4

R

S

Q

R

T

2.5 V

RC

C

T

The UCC3800/1/2/3/4/5 oscillator generates a sawtooth waveform

on RC. The rise time is set by the time constant of RT and CT . The

fall time is set by CT and an internal transistor on-resistance of

approximately 125. During the fall time, the output is off and the

maximum duty cycle is reduced below 50% or 100% depending on

the part number. Larger timing capacitors increase the discharge

time and reduce the maximum duty cycle and frequency.

Figure 1

Figure 2

UCC1803/05 V

REF

UCC1800/01/02/04 Oscillator Frequency

vs

V

R and C

CC

T

I

L

= 0.5 mA

Figure 4

Figure 3

8

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ꢀꢁꢁ ꢂ ꢃꢄ ꢄ ꢅ ꢂ ꢃ ꢄꢆ ꢅ ꢂ ꢃꢄ ꢂ ꢅ ꢂ ꢃ ꢄ ꢇ ꢅꢂ ꢃ ꢄ ꢈ ꢅꢂ ꢃꢄ ꢉꢊ ꢋ ꢆ

ꢌ ꢍꢎꢊꢏꢍ ꢎ ꢐꢑ ꢒꢓ ꢁꢔꢍ ꢕ ꢁꢀꢑ ꢑꢐꢖꢗꢊꢔꢍ ꢘ ꢐ ꢏ ꢎꢔ

ꢙ

SGLS121B − JULY 2002 − REVISED 2004

UCC1800/02/03 Maximum Duty Cycle vs

Oscillator Frequency

UCC1803/05 Oscillator Frequency vs

R and C

T

Figure 5

Figure 6

UCC1801/04/05 Maximum Duty Cycle

vs

UCC1800 I

vs

CC

Oscillator Frequency

Figure 7

Figure 8

9

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ꢀ ꢁꢁꢂ ꢃ ꢄ ꢄ ꢅꢂ ꢃꢄ ꢆꢅ ꢂꢃ ꢄ ꢂꢅ ꢂ ꢃ ꢄ ꢇ ꢅ ꢂ ꢃ ꢄ ꢈ ꢅꢂ ꢃ ꢄ ꢉ ꢊꢋ ꢆ

ꢌ ꢍꢎꢊꢏ ꢍꢎꢐꢑ ꢒꢓ ꢁ ꢔꢍꢕ ꢁꢀ ꢑꢑ ꢐꢖꢗꢊꢔꢍ ꢘ ꢐ ꢏꢎ ꢔ

ꢙ

SGLS121B − JULY 2002 − REVISED 2004

Dead Time

vs

UCC1805 I

vs

Oscillator Frequency

CC

C

T

R = 100 kW

T

Figure 10

Figure 9

COMP to CS Offset

vs

Temperature

CS = 0 V

Figure 11

10

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ꢀꢁꢁ ꢂ ꢃꢄ ꢄ ꢅ ꢂ ꢃ ꢄꢆ ꢅ ꢂ ꢃꢄ ꢂ ꢅ ꢂ ꢃ ꢄ ꢇ ꢅꢂ ꢃ ꢄ ꢈ ꢅꢂ ꢃꢄ ꢉꢊ ꢋ ꢆ

ꢌ ꢍꢎꢊꢏꢍ ꢎ ꢐꢑ ꢒꢓ ꢁꢔꢍ ꢕ ꢁꢀꢑ ꢑꢐꢖꢗꢊꢔꢍ ꢘ ꢐ ꢏ ꢎꢔ

ꢙ

SGLS121B − JULY 2002 − REVISED 2004

MECHANICAL DATA

D (R-PDSO-G**)

PLASTIC SMALL-OUTLINE PACKAGE

8 PINS SHOWN

0.020 (0,51)

0.050 (1,27)

8

0.010 (0,25)

0.014 (0,35)

5

0.244 (6,20)

0.228 (5,80)

0.008 (0,20) NOM

0.157 (4,00)

0.150 (3,81)

Gage Plane

1

4

0.010 (0,25)

0°− 8°

A

0.044 (1,12)

0.016 (0,40)

Seating Plane

0.004 (0,10)

0.010 (0,25)

0.069 (1,75) MAX

0.004 (0,10)

PINS **

8

14

16

DIM

A MAX

0.197

(5,00)

0.344

(8,75)

0.394

(10,00)

0.189

(4,80)

0.337

(8,55)

0.386

(9,80)

A MIN

4040047/E 09/01

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.

C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).

D. Falls within JEDEC MS-012

11

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PACKAGE OPTION ADDENDUM

www.ti.com

25-Feb-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

SOIC

Drawing

UCC2800QDRQ1

UCC2801QDRQ1

UCC2802QDRQ1

UCC2803QDRQ1

UCC2804QDRQ1

ACTIVE

D

8

2500

None

CU NIPDAU Level-1-260C-UNLIM

Call TI

Level-1-220C-UNLIM

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional

product content details.

None: Not yet available Lead (Pb-Free).

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,

including bromine (Br) or antimony (Sb) above 0.1% of total product weight.

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

IMPORTANT NOTICE

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