UCC3813DTR-4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

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

Low Power Economy BiCMOS Current Mode PWM

FEATURES

DESCRIPTION

100µA Typical Starting Supply Current

The UCC3813-0/-1/-2/-3/-4/-5 family of high-speed, low-power inte-

grated 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.

500µA Typical Operating Supply Current

Operation to 1MHz

These devices have the same pin configuration as the UC3842/3/4/5

family, and also offer the added features of internal full-cycle soft start

and internal leading-edge blanking of the current-sense input.

Internal Soft Start

Internal Fault Soft Start

Internal Leading-Edge Blanking of the

Current Sense Signal

The UCC3813-0/-1/-2/-3/-4/-5 family offers a variety of package options,

temperature range options, choice of maximum duty cycle, and choice

of critical voltage levels. Lower reference parts such as the UCC3813-3

and UCC3813-5 fit best into battery operated systems, while the higher

reference and the higher UVLO hysteresis of the UCC3813-2 and

UCC3813-4 make these ideal choices for use in off-line power supplies.

1 Amp Totem-Pole Output

70ns Typical Response from

Current-Sense to Gate Drive Output

1.5% Tolerance Voltage Reference

The UCC2813-x series is specified for operation from –40°C to +85°C

and the UCC3813-x series is specified for operation from 0°C to +70°C.

Same Pinout as UCC3802, UC3842, and

UC3842A

ORDERING INFORMATION

Part Number

UCCx813-0

UCCx813-1

UCCx813-2

UCCx813-3

UCCx813-4

UCCx813-5

Maximum Duty Cycle

Reference Voltage

Turn-On Threshold

Turn-Off Threshold

100%

50%

5V

4V

5V

4V

7.2V

9.4V

6.9V

7.4V

8.3V

3.6V

8.3V

3.6V

100%

50%

12.5V

4.1V

12.5V

4.1V

50%

BLOCK DIAGRAM

UDG-96134

04/99

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

ABSOLUTE MAXIMUM RATINGS (Note 1)

CONNECTION DIAGRAMS

VCC Voltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V

VCC Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.0mA

OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A

OUT Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . 20.0µJ

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

Power Dissipation at T_A< +25°C (N Package). . . . . . . . . 1.0W

Power Dissipation at T_A< +25°C (D Package). . . . . . . . 0.65W

Storage Temperature . . . . . . . . . . . . . . . . . . . –65 C to +150°C

Junction Temperature. . . . . . . . . . . . . . . . . . . –55 C to +150°C

Lead Temperature (Soldering, 10 Seconds). . . . . . . . . +300°C

DIL-8 or SOIC-8 (TOP VIEW)

N or D PACKAGE

COMP

FB

1

2

3

4

8

7

6

5

REF

VCC

OUT

GND

CS

Note 1: All voltages are with respect to GND. All currents are

positive into the specified terminal. Consult Unitrode Integrated

Circuits databook for information regarding thermal specifica-

tions and limitations of packages.

RC

Note 2: In normal operation VCC is powered through a current

limiting resistor. Absolute maximum of 12V applies when VCC

is driven from a low impedance source such that ICC does not

exceed 30mA.

TSSOP-8 (TOP VIEW)

PW PACKAGE

TEMPERATURE RANGE

–40°C TO +85°C

PACKAGES

N, D, PW

UCC2813

UCC3813

REF

VCC

COMP

1

2

3

4

8

7

6

5

0°C TO +70°C

N, D, PW

FB

CS

ORDERING INFORMATION

OUT

GND

UCC 813

–

RC

PRODUCT OPTION

PACKAGE

TEMPERATURE RANGE

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ T_A≤ +85°C for

UCC2813-x; 0°C ≤ T_A≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. T_A= T_J.

UCC2813-x

UCC3813-x

PARAMETER

TEST CONDITIONS

UNITS

MIN

TYP

MAX

Reference Section

Output Voltage

T_J= +25°C, I = 0.2mA, UCCx813-0/-1/-2/-4

T_J= +25°C, I = 0.2mA, UCCx813-5

0.2mA < I < 5mA

4.925 5.00 5.075

V

3.94

4.00

10

4.06

30

Load Regulation

Total Variation

mV

V

UCCx813 -0-1/-2/-4 (Note 7)

UCCx813-5 (Note 7)

4.84

3.84

5.00

4.00

70

5.10

4.08

V

Output Noise Voltage

Long Term Stability

Output Short Circuit

Oscillator Section

Oscillator Frequency

10Hz ≤ f ≤ 10kHz, T_J= +25°C (Note 9)

T_A= +125 C, 1000 Hours (Note 9)

µV

mV

mA

5

–5

–35

UCCx813-0/-1/-2/-4 (Note 4)

UCCx813-5 (Note 4)

(Note 9)

40

26

46

31

52

36

kHz

%

Temperature Stability

Amplitude Peak-to-Peak

Oscillator Peak Voltage

2.5

2.25

2.40

2.45

2.55

V

2

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ T_A≤ +85°C for

UCC2813-x; 0°C ≤ T_A≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. T_A= T_J.

UCC2813-x

UCC3813-x

PARAMETER

TEST CONDITIONS

UNITS

MIN

TYP

MAX

Error Amplifier Section

Input Voltage

COMP = 2.5V; UCCx813-0/-1/-2/-4

COMP = 2.0V; UCCx813-3/-5

2.42

1.92

–2

2.50

2.0

2.56

2.05

2

V

Input Bias Current

Open Loop Voltage Gain

COMP Sink Current

COMP Source Current

Gain Bandwidth Product

PWM Section

µA

dB

60

80

FB = 2.7V, COMP = 1.1V

FB = 1.8V, COMP = REF – 1.2V

(Note 9)

0.4

2.5

mA

MHz

–0.2

–0.5

2

–0.8

Maximum Duty Cycle

UCCx813-0/-2/-3

UCCx813-1/-4/-5

COMP = 0V

97

48

99

49

100

50

0

%

Minimum Duty Cycle

Current Sense Section

Gain

(Note 5)

1.10

0.9

1.65

1.0

1.80

1.1

V/V

V

Maximum Input Signal

Input Bias Current

CS Blank Time

COMP = 5V (Note 6)

–200

50

200

150

1.70

1.35

nA

ns

V

100

1.55

0.90

Over-Current Threshold

COMP to CS Offset

Output Section

1.32

0.45

CS = 0V

V

OUT Low Level

I = 20mA, all parts

0.1

0.35

0.15

0.7

0.4

0.90

0.40

1.2

V

I = 200mA, all parts

I = 50mA, VCC = 5V, UCCx813-3/-5

I = 20mA, VCC = 0V, all parts

I = –20mA, all parts

V

OUT High V_SAT

(V_CC-OUT)

0.15

1.0

0.40

1.9

V

I = –200mA, all parts

I = –50mA,VCC = 5V, UCCx813-3/-5

C_L= 1nF

V

0.4

0.9

V

Rise Time

41

70

ns

Fall Time

C_L= 1nF

44

75

Undervoltage Lockout Section

Start Threshold (Note 8)

UCCx813-0

6.6

8.6

11.5

3.7

6.3

6.8

7.6

3.2

0.12

1.6

3.5

0.2

7.2

9.4

12.5

4.1

6.9

7.4

8.3

3.6

0.3

2

7.8

10.2

13.5

4.5

V

UCCx813-1

UCCx813-2/-4

UCCx813-3/-5

UCC1813-0

Stop Threshold (Note 8)

Start to Stop Hysteresis

7.5

UCC1813-1

8.0

UCCx813-2/-4

UCCx813-3/-5

UCCx813-0

9.0

4.0

0.48

2.4

UCCx813-1

UCCx813-2/-4

UCCx813-3/-5

4.2

0.5

5.1

0.8

3

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ T_A≤ +85°C for

UCC2813-x; 0°C ≤ T_A≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. T_A= T_J.

UCC2813-x

UCC3813-x

PARAMETER

TEST CONDITIONS

UNITS

MIN

TYP

MAX

Soft Start Section

COMP Rise Time

Overall Section

FB = 1.8V, Rise from 0.5V to REF–1V

4

ms

Start-up Current

VCC < Start Threshold

FB = 0V, CS = 0V, RC = 0V

ICC = 10mA (Note 8)

UCCx813-2/-4

0.1

0.5

0.23

1.2

15

mA

V

Operating Supply Current

VCC Internal Zener Voltage

12

13.5

1.0

VCC Internal Zener Voltage Minus Start

Threshold Voltage

0.5

V

Note 3: Adjust VCC above the start threshold before setting at 10V.

Note 4: Oscillator frequency for the UCCx813-0, UCCx813-2 and UCCx813-3 is the output frequency.

Oscillator frequency for the UCCx813-1, UCCx813-4 and UCCx813-5 is twice the output frequency.

V_COMP

Note 5: Gain is defined by:

A

0 ≤V_CS≤ 0.8V.

V_CS

Note 6: Parameter measured at trip point of latch with Pin 2 at 0V.

Note 7: Total Variation includes temperature stability and load regulation.

Note 8: Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another.

Note 9: Guaranteed by design. Not 100% tested in production.

PIN DESCRIPTIONS

sense comparator during the 100ns interval immediately

following the rising edge of the OUT pin. This digital filter-

ing, also called leading-edge blanking, means that in

most applications, no analog filtering (RC filter) is re-

quired on CS. Compared to an external RC filter tech-

nique, 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.

COMP: COMP is the output of the error amplifier and the

input of the PWM comparator.

Unlike other devices, the error amplifier in the UCC3813

family is a true, low output-impedance, 2MHz operational

amplifier. As such, the COMP terminal can both source

and sink current. However, the error amplifier is internally

current limited, so that you can command zero duty cycle

by externally forcing COMP to GND.

The UCC3813 family features built-in full cycle Soft Start.

Soft Start is implemented as a clamp on the maximum

COMP voltage.

The over-current comparator is only intended for fault

sensing, and exceeding the over-current threshold will

cause a soft start cycle.

FB: FB is the inverting input of the error amplifier. For

best stability, keep FB lead length as short as possible

and FB stray capacitance as small as possible.

RC: RC is the oscillator timing pin. For fixed frequency

operation, set timing capacitor charging current by con-

necting a resistor from REF to RC. Set frequency by con-

necting a timing capacitor from RC to GND. For best

performance, 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 func-

tions.

CS: CS is the input to the current sense comparators.

The UCC3813 family has two different current sense

comparators: the PWM comparator and an over-current

comparator.

The UCC3813 family contains digital current sense filter-

ing, which disconnects the CS terminal from the current

4

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

PIN DESCRIPTIONS (cont.)

The frequency of oscillation can be estimated with the low, total supply current will be higher, depending on

following equations:

OUT current. Total VCC current is the sum of quiescent

VCC current and the average OUT current. Knowing the

operating frequency and the MOSFET gate charge (Qg),

average OUT current can be calculated from:

1.5

UCCx813-0/-1/-2/-4: F =

R • C

1.0

I_OUT= Q_g• F .

UCCx813-3, UCCx813-5: F =

R • C

To prevent noise problems, bypass VCC to GND with a

ceramic capacitor as close to the VCC pin as possible.

An electrolytic capacitor may also be used in addition to

the ceramic capacitor.

where frequency is in Hz, resistance is in Ω, and capaci-

tance is in farads. The recommended range of timing re-

sistors is between 10k and 200k and timing capacitor is

100pF to 1000pF. Never use a timing resistor less than

10k.

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.

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 ±750mA. OUT is actively held

low when VCC is below the UVLO threshold.

When VCC is greater than 1V and less than the UVLO

threshold, REF is pulled to ground through a 5kΩ resis-

tor. This means that REF can be used as a logic output

indicating power system status. It is important for refer-

ence stability that REF is bypassed to GND with a ce-

ramic capacitor as close to the pin as possible. An

electrolytic capacitor may also be used in addition to the

ceramic capacitor. A minimum of 0.1µF ceramic is re-

quired. Additional REF bypassing is required for external

loads greater than 2.5mA on the reference.

The high-current power driver consists of FET output de-

vices, which can switch all of the way to GND and all of

the way to VCC. The output stage also provides a very

low impedance to overshoot and undershoot. This means

that in many cases, external schottky clamp diodes are

not required.

To prevent noise problems with high speed switching

transients, bypass REF to ground with a ceramic capaci-

tor very close to the IC package.

VCC: VCC is the power input connection for this device.

In normal operation VCC is powered through a current

limiting resistor. Although quiescent VCC current is very

APPLICATION INFORMATION

UDG-96139

The UCC3813-0/-1/-2/-3/-4/-5 oscillator generates a sawtooth waveform on RC. The rise time is set by the time constant of R_T

and C_T. The fall time is set by CT and an internal transistor on-resistance of approximately 125Ω. 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 in-

crease the discharge time and reduce the maximum duty cycle and frequency.

Figure 1. Oscillator.

5

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

APPLICATION INFORMATION (cont.)

4.00

3.98

3.96

3.94

3.92

3.90

3.88

3.86

3.84

3.82

4

4.2 4.4 4.6 4.8

5

5.2 5.4 5.6 5.8

6

V

CC (V)

Figure 2. Error amplifier gain/phase response.

Figure 5. UCC3813-3/-5 V

vs. V ; I

= 0.5mA.

REF

CC LOAD

1000

100

10

100

(k )

1000

100

RT (k )

1000

R

T

Figure 3. UCC3813-0/-1/-2/-4 oscillator frequency vs.

Figure 6. UCC3813-3/-5 oscillator frequency vs. R

T

R and C .

and C .

T

100

99.5

99

50

49.5

49

98.5

98

48.5

48

97.5

97

96.5

96

47.5

47

95.5

95

46.5

10

100

1000

10

100

1000

Oscillator Frequency (kHz)

Figure 4. UCC3813-0/-2/-3 max. duty cycle vs.

oscillator frequency.

Figure 7. UCC3813-1/-4/-5 max. duty cycle vs.

oscillator frequency.

6

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

APPLICATION INFORMATION (cont.)

16

14

12

8

7

6

5

4

3

2

1

0

, 1nF

10V

=

, 1nF

10V

V^CC

=

10

8

V^CC

, 1nF

V^CC= 8V

6

, No Load

V^CC= 10V

, No Load

4

CC

V

= 10V

, No Load

8V

=

CC

V

, No Load

8V

=

CC

V

2

0

100 200 300 400 500 600 700 800 900 1000

0

100 200 300 400 500 600 700 800 900 1000

Oscillator Frequency (kHz)

Figure 8. UCC3813-0 I vs. oscillator frequency.

Figure 10. UCC3813-5 I vs. oscillator frequency.

CC

1.1

1.0

0.9

0.8

500

450

UCC1803/5

400

350

300

250

UCC1800/1/2/4

Slope = 1.8mV/°C

200

150

100

50

0.7

0.6

0

100

200

300

400

500

600

700

800

900 1000

-55-50 -25

0

25

50

75

100

125

CT (pF)

Temperature (°C)

Figure 9. Dead time vs. C , R = 100k.

Figure 11. COMP to CS offset vs. temperature,

CS = 0V.

T

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

7

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pertaining to warranty, patent infringement, and limitation of liability.

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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

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