OB2269CP各脚功能电路原理芯片引脚定义引脚图及功能IC贸易商-中国IC网-芯三七

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产品型号OB2269CP的概述

芯片OB2269CP的概述 OB2269CP是一款由瑞萨电子（Renesas Electronics）公司生产的高性能集成电路，主要用于电源管理和控制。它是一款专用于LED驱动、开关电源、以及其他低功耗的应用场合的PWM（脉宽调制）控制器。OB2269CP采用了先进的设计理念，结合了高效率、低待机功耗和优良的热稳定性，使其在现代电子产品中得到了广泛应用。该芯片的设计目标在于为开发者提供一个简单、易于使用且具备高效能的解决方案，以应对复杂的电源设计挑战。 OB2269CP可以适用于多种电源架构，包括但不限于反激式（flyback）、升压式（boost）和降压式（buck）转换等。这使得该芯片可以广泛应用于LED驱动电源、开关电源、消费电子、工业设备等领域。在市场上，OB2269CP因其出色的性能和兼容性获得了众多设计工程师的青睐。芯片OB2269CP的详细参数 OB2269CP的详细参...

产品型号OB2269CP的Datasheet PDF文件预览

OB2268

OB2269

Current Mode PWM Controller

OB2268/9 is offered in SOP-8 and DIP-8 packages.

GENERAL DESCRIPTION

FEATURES

OB2268/9 is a highly integrated current mode PWM

control IC optimized for high performance, low

standby power and cost effective offline flyback

converter applications in above 20W power level.

PWM switching frequency at normal operation is

externally programmable and trimmed to tight range.

At no load or light load condition, the IC operates in

extended ‘burst mode’ to minimize switching loss.

Lower standby power and higher conversion

efficiency is thus achieved.

VDD low startup current and low operating current

contribute to a reliable power on startup design with

OB2268/9. A large value resistor could thus be used

in the startup circuit to minimize the standby power.

The internal slope compensation improves system

large signal stability and reduces the possible sub-

harmonic oscillation at high PWM duty cycle output.

Leading-edge blanking on current sense input

removes the signal glitch due to snubber circuit diode

reverse recovery. and greatly reduces the external

component count and system cost in the design.

OB2268/9 offers complete protection coverage with

automatic self-recovery feature including Cycle-by-

Cycle current limiting (OCP), over load protection

(OLP), over temperature protection (OTP), VDD

over voltage protection (OVP) and under voltage

lockout (UVLO). The Gate-drive output is clamped

to maximum 18V to protect the power MOSFET.

Excellent EMI performance is achieved with On-

Bright proprietary frequency shuffling technique

(OB2269 only) together with soft switching control at

the totem pole gate drive output.

■

Extended Burst Mode Control For Improved

Efficiency and Minimum Standby Power Design

Audio Noise Free Operation

External Programmable PWM Switching

Frequency

■

Internal Synchronized Slope Compensation

Low VIN/VDD Startup Current(4uA) and Low

Operating Current (2.3mA)

■

Leading Edge Blanking on Current Sense Input

Complete Protection Coverage With Auto Self-

Recovery

External Programmable Over Temperature

Protection (OTP)

With or Without On-chip VDD OVP for

Output Over Voltage Protection.

Under Voltage Lockout with Hysteresis

(UVLO)

Gate Output Maximum Voltage Clamp (18V)

Line Compensated Cycle-by-Cycle Over-

current Threshold Setting For Constant Output

Current Limiting Over Universal Input Voltage

Range (OCP)

Over Load Protection. (OLP)

■

On-Bright Proprietary Frequency Shuffling

Technology for Improved EMI Performance

(OB2269 only)

APPLICATIONS

Offline AC/DC flyback converter for

■

Laptop Power Adaptor

PC/TV/Set-Top Box Power Supplies

Open-frame SMPS

The tone energy at below 20KHZ is minimized in

operation. Consequently, audio noise performance is

greatly improved.

Battery Charger

TYPICAL APPLICATION

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 1 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

GENERAL INFORMATION

Pin Configuration

The OB2268/9 is offered in DIP and SOP packages

shown as below.

Package Dissipation Rating

Package

RθJA (°C/W)

DIP8

SOP8

150

Absolute Maximum Ratings

Parameter

V_DDInput Voltage

VIN Input Voltage

Value

36 V

V_DDClamp Continuous Current 10 mA

V_FBInput Voltage

-0.3 to 7V

V_SENSEInput Voltage to Sense

-0.3 to 7V

V_RTInput Voltage to RT Pin

V_RIInput Voltage to RI Pin

Min/Max Operating Junction

Temperature T_J

-0.3 to 7V

-20 to 150 ^oC

Ordering Information

Part Number

Description

Min/Max Storage Temperature -55 to 150 ^oC

T_stg

OB2268AP

No Frequency Shuffling,

DIP8, Pb-free

Note: Stresses beyond those listed under “absolute maximum

ratings” may cause permanent damage to the device. These are

stress ratings only, 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.

OB2268APV

OB2269CP

No Frequency Shuffling,

DIP8, Pb-free and no OVP

With Frequency Shuffling,

SOP8, Pb-free

OB2269CPV

With Frequency Shuffling,

SOP8, Pb-free and no OVP

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 2 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

Marking Information

TERMINAL ASSIGNMENTS

Pin Num Pin Name

I/O Description

GND

Ground

Feedback input pin. PWM duty cycle is determined by voltage level into this

pin and current-sense signal level at Pin 6.

VIN

Connected through a large value resistor to rectified line input for Start up

chip supply and line voltage sensing.

Internal Oscillator frequency setting pin. A resistor connected between RI

and GND sets the PWM frequency.

Temperature sensing input pin. Connected through a NTC resistor to GND.

Once the voltage of the RT pin drops below a fixed limit of 1.05V, PWM

output will be disabled.

SENSE

Current sense input pin. Connected to MOSFET current sensing resistor

node.

VDD

GATE

DC power supply pin.

Totem-pole gate drive output for power MOSFET.

©On-Bright Electronics

A Liteon Semiconductor Company

Confidential

- 3 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

BLOCK DIAGRAM

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 4 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

ESD INFORMATION

Symbol

HBM^Note

Parameter

Test Conditions

MIL-STD

JEDEC-STD

Min Typ

Max Unit

Human Body Model

Machine Model on

All Pins

250

Note: HBM all pins pass 2KV except VIN pin. The details are VIN passes 1kV, VDD and GATE pass 2KV, all other I/Os pass 8KV. In

system application, VIN pin is either a high impedance input or left floating. The lower rating has minimum impacts on system ESD

performance.

ELECTRICAL CHARACTERISTICS

(T_A= 25^OC if not otherwise noted)

Symbol

Supply Voltage (VDD, VIN)

I_V_DD_Startup VDD Start up

Current

I_V_DD_Operation Operation Current

Parameter

Test Conditions

Min

Typ

Max

Unit

VDD =15V, RI=100K

Measure current into VDD

VDD=18V, RI=100Kohm,

V_FB=3V, Gate floats

2.3

10.5

UVLO(ON)

UVLO(OFF)

VDD Under

Voltage Lockout

Enter

VDD Under

Voltage Lockout

Exit (Recovery)

9.5

11.5

17.5

15.5

16.5

OVP(ON)^*OptionalVDD Over Voltage

Protection Enter

23.5

21.5

26.5

24.5

OVP(OFF)^*OptionalVDD Over Voltage

Protection Exit

(Recovery)

OVP_Hysteresis OVP(ON)-

OVP(OFF)

T_D_OVP

VDD OVP

uSec

Debounce time

V_DDZener Clamp

Voltage

V_DD_Clamp

I(V_DD) = 10 mA

Feedback Input Section(FB Pin)

V_{FB_}Open

I_FB_Short

V_TH_BM

V_TH_PL

T_D_PL

V_FBOpen Loop

Voltage

FB pin short circuit Short FB pin to GND and

6.0

0.65

1.8

4.4

current

measure current

Burst Mode FB

Threshold Voltage

Power Limiting FB

Threshold Voltage

Power limiting

Debounce Time

Input Impedance

mSec

Kohm

Z_FB_IN

9.0

400

Current Sense Input(Sense Pin)

T_blanking

Leading edge

blanking time

Input Impedance

RI = 100Kohm

Z_SENSE_IN

Kohm

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 5 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

T_D_OC

Over Current

Detection and

Control Delay

From Over Current Occurs

to GATE output turns off,

Sense voltage ramp at

0.15V/uS.

120

nSec

V_TH_OC

Internal Current

VDD = 16V, I(VIN) =

0.86

Limiting Threshold 55uA

Voltage

Oscillator

F_OSC

Normal Oscillation RI = 100 Kohm

Frequency

KHZ

∆f_Temp

∆f_Volt

Frequency

Temperature

Stability

VDD = 16V, RI =

100Kohm, 0^oC to 85 ^oC

Frequency Voltage VDD = 15-25V, RI =

Stability

100Kohm

RI_range

V_RI_open

Operating RI Range

RI open load

voltage

100

2.0

250

0.3

Kohm

F_BM

Burst Mode Base

Frequency

VDD = 16V, RI =

100Kohm

KHZ

Gate Drive Output

VOL

VOH

Output Low Level

Output High Level

Output Clamp

VDD = 16V, Io = 20 mA

VG_Clamp

Voltage Level

T_r

T_f

Output Rising Time VDD = 16V, CL = 1nf

120

nSec

Output Falling

Time

VDD = 16V, CL = 1nf

Over Temperature Protection

I_RT

Output Current of

RT pin

RI=100K

V_TH_OTP

V_TH_OTP_off

T_D_OTP

OTP Threshold

Voltage

OTP Recovery

Threshold Voltage

OTP De-bounce

Time

1.015 1.065 1.115

1.165

100

uSec

V_RT_Open

RT Pin Open

Voltage

RI=100K

3.5

Frequency Shuffling (OB2269 Only)

∆f_OSC

Frequency

-5

Modulation range

/Base frequency

Shuffling

f_Shuffling

Frequency

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 6 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

CHARACTERIZATION PLOTS

VDD UVLO and Operation Current

VDD Start-up Current vs. Voltage

2.5

1.5

0.5

10 12 14 16 18 20 22 24

VDD Voltage (V)

VDD VOLTAGE (V)

VDD Operation Current vs. Load

Frequency vs. RI

Fosc 50Khz

Fosc 65Khz

Fosc 100Khz

140

120

100

110

140

170

200

230

500

1000

1500

2000

Frequency (KHz)

Gatedrive Loading (pf)

OCP threshold vs. Ivin

0.94

0.89

0.84

0.79

0.74

0.69

20 40 60 80 100 120 140 160 180 200 220 240 260 280 300

Ivin(uA)

©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 7 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

OPERATION DESCRIPTION

The OB2268/9 is a highly integrated PWM

controller IC optimized for offline flyback

converter applications in above 20W power range.

The extended burst mode control greatly reduces

the standby power consumption and helps the

design easily meet the international power

conservation requirements.

to minimize the switching loss thus reduce the

standby power consumption to the greatest extend.

The nature of high frequency switching also

reduces the audio noise at any loading conditions.

•

Oscillator Operation

A resistor connected between RI and GND sets the

constant current source to charge/discharge the

internal cap and thus the PWM oscillator frequency

is determined. The relationship between RI and

switching frequency follows the below equation

within the specified RI in Kohm range at nominal

loading operational condition.

•

Startup Current and Start up Control

Startup current of OB2268/9 is designed to be very

low so that VDD could be charged up above UVLO

threshold level and device starts up quickly. A large

value startup resistor can therefore be used to

minimize the power loss yet reliable startup in

application. For AC/DC adaptor with universal

input range design, a 2 MΩ, 1/8 W startup resistor

could be used together with a VDD capacitor to

provide a fast startup and yet low power dissipation

design solution.

F_PWM= 6500/RI (KHZ)

•

Current Sensing and Leading Edge Blanking

Cycle-by-Cycle current limiting is offered in

OB2268/9 current mode PWM control. The switch

current is detected by a sense resistor into the sense

pin. An internal leading edge blanking circuit chops

off the sense voltage spike at initial MOSFET on

state due to Snubber diode reverse recovery so that

the external RC filtering on sense input is no longer

needed. The current limit comparator is disabled

and cannot turn off the external MOSFET during

the blanking period. The PWM duty cycle is

determined by the current sense input voltage and

the FB input voltage.

•

Operating Current

The Operating current of OB2268/9 is low at

2.3mA. Good efficiency is achieved with

OB2268/9 low operating current together with

extended burst mode control schemes.

•

Frequency shuffling for EMI improvement

The frequency Shuffling/jittering (switching

frequency modulation) is implemented in OB2269.

The oscillation frequency is modulated with a

random source so that the tone energy is spread out.

The spread spectrum minimizes the conduction

band EMI and therefore eases the system design.

•

Internal Synchronized Slope Compensation

Built-in slope compensation circuit adds voltage

ramp onto the current sense input voltage for PWM

generation. This greatly improves the close loop

stability at CCM and prevents the sub-harmonic

oscillation and thus reduces the output ripple

voltage.

•

Burst Mode Operation

At zero load or light load condition, most of the

power dissipation in a switching mode power

supply is from switching loss on the MOSFET

transistor, the core loss of the transformer and the

loss on the snubber circuit. The magnitude of

power loss is in proportion to the number of

switching events within a fixed period of time.

Reducing switching events leads to the reduction

on the power loss and thus conserves the energy.

OB2268/9 self adjusts the switching mode

according to the loading condition. At from no load

to light/medium load condition, the FB input drops

below burst mode threshold level (1.8V). Device

enters Burst Mode control. The Gate drive output

switches only when VDD voltage drops below a

preset level and FB input is active to output an on

state. Otherwise the gate drive remains at off state

•

Over Temperature Protection

An NTC resistor in series with a regular resistor

should connect between RT and GND for

temperature sensing and protection. NTC resistor

value becomes lower when the ambient temperature

rises. With the fixed internal current I_RTflowing

through the resistors, the voltage at RT pin

becomes lower at high temperature. The internal

OTP circuit is triggered and shutdown the

MOSFET when the sensed input voltage is lower

than V_TH_OTP.

•

Gate Drive

Confidential

A Liteon Semiconductor Company

- 8 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

OB2268/9 Gate is connected to an external

MOSFET gate for power switch control. Too weak

the gate drive strength results in higher conduction

and switch loss of MOSFET while too strong gate

drive output compromises the EMI.

A good tradeoff is achieved through the built-in

totem pole gate design with right output strength

and dead time control. The low idle loss and good

EMI system design is easier to achieve with this

dedicated control scheme. An internal 18V clamp is

added for MOSFET gate protection at higher than

expected VDD input.

The OCP threshold is input line voltage adjusted to

compensate the increased output current limit at

higher voltage caused by inherent Over-Current

sensing and control delay. A constant output power

limit is achieved with recommended reference

design on OB2268/9.

At overload condition when FB input voltage

exceeds power limit threshold value for more than

80mS, control circuit reacts to shut down the output

power MOSFET. Device restarts when VDD

voltage drops below UVLO limit.

Similarly, control circuit shuts down the power

MOSFET when an Over Temperature condition is

detected. OB2268/9 resumes the operation when

temperature drops below the hysteresis value.

VDD is supplied with transformer auxiliary

winding output. It is clamped when VDD is higher

than 30V. The power MOSFET is shut down when

VDD drops below UVLO limit and device enters

•

Protection Controls

Good system reliability is achieved with

OB2268/9’s rich protection features including

Cycle-by-Cycle current limiting (OCP), Over Load

Protection (OLP), over temperature protection

(OTP), on-chip VDD over voltage protection (OVP,

optional) and under voltage lockout.(UVLO).

power

start-up

sequence

thereafter.

Confidential

A Liteon Semiconductor Company

- 9 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

PACKAGE MECHANICAL DATA

8-Pin Plastic DIP

Confidential

A Liteon Semiconductor Company

- 10 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

8-Pin Plastic SOP

Confidential

A Liteon Semiconductor Company

- 11 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

IMPORTANT NOTICE

RIGHT TO MAKE CHANGES

On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements,

improvements, and other changes to its products and services at any time and to discontinue any product or

service without notice. Customers should obtain the latest relevant information before placing orders and should

verify that such information is current and complete.

WARRANTY INFORMATION

On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at

the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used

to the extent it deems necessary to support this warranty. Except where mandated by government requirements,

testing of all parameters of each product is not necessarily performed.

On-Bright Electronics Corp. assumes no liability for applications assistance or customer product design.

Customers are responsible for their products and applications using On-Bright’s components, data sheet and

application notes. To minimize the risks associated with customer products and applications, customers should

provide adequate design and operating safeguards.

LIFE SUPPORT

On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to

support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims

resulting from the use of its products in medical applications.

MILITARY

On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics

Corp. and Liteon Semiconductor Corp. will not be held liable for any damages or claims resulting from the use

of its products in military applications.

Confidential

A Liteon Semiconductor Company

- 12 -

V2.1

OB2269CP相关文章

配单直通车

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QQ：528164397 复制

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柒号芯城电子商务（深圳）有限公司服务专线: 18922803401 在线联系:

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OB24-12产品参数

型号:	OB24-12
生命周期：	Contact Manufacturer
IHS 制造商：	AVEL LINDBERG
Reach Compliance Code：	unknown
ECCN代码：	EAR99
HTS代码：	8504.31.40.35
风险等级：	5.6
其他特性：	PCB MOUNTABLE
认证：	UL; CSA; VDE; IEC
中心点击功能1：	NO
中心点击功能2：	NO
高度：	31.4 mm
长度：	67.8 mm
制造商序列号：	OB
安装特点：	CHASSIS MOUNT
次级绕组数量：	2
输出电流 1：	1 A
输出电压 1：	12 V
物理尺寸：	67.8mm X 57mm X 31.4mm
主要评分：	DUAL 115V
表面贴装：	NO
变压器类型：	POWER TRANSFORMER
VA 额定值：	24 VA
宽度：	57 mm
Base Number Matches：	1

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产品型号OB2269CP的概述

产品型号OB2269CP的Datasheet PDF文件预览

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