SDC602_技术文档

Datasheet

Current Mode PWM Controller

General Description

SDC602

Features

SDC602 is a high-performance current mode control IC

designed for AC/DC convertor, which supplies about

continuous 5W output power at the universal AC input

range from 85V to 265V.



Built-in high voltage power transistor of 700V

Cycle-by-cycle current limit

Very low power consumption under no load

Internal slope compensation and feedback

compensation



Over load protection

Built-in high precise current limit with temperature

compensation



Over temperature protection

Low startup and operating current

VCC over-voltage clamp

5W output power at the universal AC input range,

8W output power at AC input 220V

Package: DIP-8



Applications



Offline AC/DC flyback converter

Adaptor/Charger for cell and other portable

Apparatus

DIP-8

Figure 1. Package Type

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Datasheet

Current Mode PWM Controller

Pin Configuration

SDC602

Package: DIP-8

OB

OC

1

8

NC

GND

FB

7

6

2

3

OC

NC

VCC

4

5

Figure 2. Pin Configuration

Pin Number

Pin Name

OB

Function

1

2

Startup current input, connecting to startup resistor

NC

No connection

3

4

5

6

GND

FB

VCC

NC

Ground

Feedback pin

Supply voltage

No connection

7,8

OC

Output of HV transistor, connecting to primary wind of transformer

Table 1. Pin Configuration

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Datasheet

Current Mode PWM Controller

Functional Block Diagram

SDC602

VCC

OB

OC

STC

VREF

Dmax

OSC

OLP

DRVU

OVP

UVP

10V

3.5V

FB

COMP

FB

2.7V

OTP

CS

COMP

PWM

0.6V

GND

Figure 3. Functional Block Diagram

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Datasheet

Current Mode PWM Controller

Ordering Information

SDC602

-

X

SDC602 X

E1: Pb-free

G1: Halogen-free

Circuit Type

Package

DIP-8: Z

Blank: Tube

Part Number

Marking ID

Package

Temperature

Packing Type

Pb-free

Halogen-free

Pb-free

SDC602

Halogen-free

SDC602G

DIP-8

SDC602Z -E1

SDC602Z -G1

Tube

-40℃~85℃

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Datasheet

Current Mode PWM Controller

SDC602

Absolute Maximum Ratings (NOTE: Stresses greater than those listed under Absolute Maximum Ratings may cause

permanent damage to the device.)

Parameter

Power supply voltage VCC

Collector current

Symbol

V_CC

I_C

Value

18

1.5

Unit

V

A

Endurance voltage of OC collector

Peak value of switching current

Total dissipation power

Operating Junction Temperature

Storage temperature range

Lead temperature (soldering, 10sec)

Latch-up test per JEDEC 78

ESD, HBM model per Mil-Std-883, Method 3015

ESD, MM model per JEDEC EIA/JESD22-A115

V

V_CB

Ip

P_D

T_J

T_STG

T_LEAD

-0.3~700

300

1000

-40~150

-55~150

260

200

2000

200

mA

mW

°C

mA

V

-

HBM

MM

Table 2. Absolute Maximum Ratings

Recommended Operating Conditions

Symbol

V_CC

Parameter

Power supply voltage, VCC

Operating temperature

Min

4.8

-40

Max

9.0

85

Unit

V

°C

Ta

Table 3. Recommended Operating Conditions

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Datasheet

Current Mode PWM Controller

SDC602

Electrical Characteristics (Ta=25°C, V_CC=7.0V, unless otherwise specified)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Output Section

On-state saturation voltage drop

Output rise time

I

_OC=270mA

C_L=1nF

-

1

V

ns

V_SAT

75

2.6

T_r

Output fall time

-

ns

T_f

HV start-up current

1

mA

I_STC

Oscillator Section

f_OSC

Oscillation frequency

Temperature Stability

-

55

-

61

-

68

1

kHz

%

V_CC=4.8V~9V

Ta=0°C~85°C

△F_V

△F_T

-

1

%

Feedback Section

Pull-up current

Pull-down resistance

V_FB=2.5V

-

0.40

10

-

0.55

15

0.70

20

mA

kΩ

dB

I_FB

R_FB

Input impedance

PSRR

V_CC=4.8V~9V

60

70

Current Sampling Section

Over current threshold voltage

Current limit

-

0.55

0.60

0.27

60

0.65

0.29

70

V

A

V_{TH_OC}

I_{TH_OC}

0.25

PSRR

-

dB

ns

Over current detection and control delay

150

250

T_D

PWM Section

Maximum duty cycle

Minimum duty cycle

V_FB=4.0V

-

52

-

57

62

-

%

D_MAX

D_MIN

1.5

Power Current Section

Startup leakage current

Static operation current

Startup threshold voltage

Minimal operating voltage

Restart voltage

-

15

2.8

9.0

3.5

2.0

10

50

4.0

9.4

3.8

2.4

10.6

uA

mA

V

I_ST

2.0

8.6

3.2

1.7

9.6

I_OP

V_ST

V_UV

V_RST

V_OV

V_FB=0V，V_CC=8V

-

V

Over voltage protection

V

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Datasheet

Current Mode PWM Controller

SDC602

Parameter

Symbol

OTP Section

T_OTP

Conditions

Min

Typ

Max

Unit

Thermal shutdown temperature

-

150

-

℃

BJT Section

I_CBO

Collector cutoff current

V

_CB=700V, I_E=0

-

0.1

-

mA

V

Collector-emitter cutoff current

Collector-base cutoff current

Collector-base breakdown voltage

Collector-emitter sustain voltage

Collector-base sustain voltage

DC current gain

V_CE=450V, I_B=0

V_EB=9V, I_C=0

I_C=0.1mA

-

I_CEO

-

I_EBO

700

400

9

-

V_CBO

I_C=1mA

-

V

V_CEO

I_E=0.1mA

-

V

V_EBO

V_CE=5V, I_C=0.5A

I_C=1A, I_B=0.25A

15

-

30

0.9

1.2

-

h_FE

Collector-emitter saturation voltage

Base-emitter saturation voltage

0.3

0.9

V

V_{CE_STA}

V_{BE_STA}

V

Table 4. Electrical Characteristics

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Datasheet

Current Mode PWM Controller

SDC602

Function Description

Startup control

Current limit

During Startup phase, reference voltage, the oscillator

and all protection circuits are OFF. Startup current of

SDC602 is designed to be very low so that VCC could be

charged up above UVLO threshold level and device starts

up quickly. A large startup resistor can therefore be used

to minimize the power loss yet achieve a reliable startup

in application.

The output is shut off to limit the power when voltage of

IS Pin exceeds Current sense threshold voltage.

Green mode control

Under no-load and light-load condition, the switching

frequency internally decreases to lower the switching

power loss and improve the conversion efficiency. If FB is

less than 2.7V(Typ), the cycle of the oscillator will increase

with it, the less FB is, the wider the cycle of the oscillator

is, until the oscillation stop.

PWM control

The peak current (sensed on the IS pin) is set by the

voltage on FB pin. By comparing the voltage on FB pin and

the IS ramp voltage, the duty-cycle of the PWM

modulator is thus adjusted to provide the necessary load

current at the desired output voltage. FB can be

controlled by internal control circuit and external

feedback circuit.

Power transistor drive

During the ON cycle, OB pin supplies base current for the

power transistor, OE pulls down the emitter of the power

transistor to IS, and OB is adaptive to the IS current. If the

current of IS exceeds the specified current of FB, SDC602

will turn into the OFF cycle. During the OFF cycle, OB is

pulled down, the power transistor will shut off.

VCC over voltage protection

VCC over voltage protection circuit is integrated into IC.

When VCC voltage reaches 9.8V(TYP), FB voltage is pulled

down via internal control circuit, then the PWM switching

is shut off. When VCC voltage goes down below 9.8V(TYP),

the switching is reactivated. The VCC over voltage

protection ensures IC to operate reliably.

Over temperature protection

When IC’s internal temperature reaches 150°C, FB

voltage will be pulled down by internal control circuit,

the switching frequency decreases or shut off. This

protection protects the IC from over temperature.

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Datasheet

Current Mode PWM Controller

Typical Application

SDC602

V+

GND

OC

OB

NC

OC

NC

GND

FB

VCC

SDC602

Figure 4. Typical Application

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Datasheet

Current Mode PWM Controller

SDC602

Package Dimension

DIP-8

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min

Max

Min

Max

A

A1

A2

B

3.710

0.510

3.200

0.380

4.310

0.146

0.020

0.126

0.015

0.170

3.600

0.570

0.142

0.022

B1

C

1.524(BSC)

2.540(BSC)

0.060(BSC)

0.100(BSC)

0.204

9.000

6.200

7.320

0.360

9.400

6.600

7.920

0.008

0.354

0.244

0.288

0.014

0.370

0.260

0.312

D

E

E1

e

L

3.000

8.400

3.600

9.000

0.118

0.331

0.142

0.354

E2

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Datasheet

Current Mode PWM Controller

SDC602

Shaoxing Devechip Microelectronics Co., Ltd.

UUUhttp://www.sdc-semi.com/UUU

IMPORTANT NOTICE

Information in this document is provided solely in connection with Shaoxing Devechip Microelectronics Co., Ltd. (abbr. SDC) products.

SDC reserves the right to make changes, corrections, modifications or improvements, to this document, and the products and services

described herein at anytime, without notice. SDC does not assume any responsibility for use of any its products for any particular

purpose, nor does SDC assume any liability arising out of the application or use of any its products or circuits. SDC does not convey

any license under its patent rights or other rights nor the rights of others.

Contact us:

Headquarters of Shaoxing

Address: Tian Mu Road, No13,

Shaoxing city, Zhejiang province, China

Zip code: 312000

Shenzhen Branch

Address: 22A, Shangbu building, Nan Yuan Road, No.68,

Futian District, Shenzhen city, Guangdong province, China

Zip code: 518031

Tel: (86) 0575-8861 6750

Tel: (86) 0755-8366 1155

Fax: (86) 0575-8862 2882

Fax: (86) 0755-8301 8528

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型号：	SDC602
厂家：	Shaoxing Devechip Microelectronics Co., Ltd
描述：	Current Mode PWM Controller
文件：	总11页 (文件大小：367K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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