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LT1508

Power Factor and PWM

Controller (Voltage Mode)

FEATURES

s

DESCRIPTION

The LT

廬

1508 is a complete solution for universal off-line

switching power supplies utilizing active power factor

correction. The PFC section is identical to the LT1248 PFC

controller except the EN/SYNC pin is removed because

PFC and PWM are synchronized internally.

The voltage mode PWM section (LT1509 is the current

mode counterpart) contains all the primary side functions

to convert the PFC preregulated high voltage output to an

isolated low voltage output. The PWM duty cycle is

internally limited to 47% (maximum 50%) to prevent

transformer saturation. PWM soft start begins when the

PFC output reaches the preset voltage. In the event of brief

line loss, PWM will be shut off when the PFC output

voltage drops below 73% of the preset value.

, LTC and LT are registered trademarks of Linear Technology Corporation.

PFC and PWM Single Chip Solution

Synchronized Operation up to 300kHz

99% Power Factor Over 20:1 Load Current Range

Voltage Mode PWM

Instantaneous Overvoltage Protection

Dedicated Overvoltage Protection (OVP Pin)

Minimal Line Current Dead Zone

Typical 250碌A Start-Up Supply Current

Line Switching Noise Filter

Low Quiescent Current: 13mA

Fast 1.5A Peak Current Gate Drivers

Separate Soft Start Control

APPLICATIONS

s

Universal Power Factor Corrected Power Supplies

and Preregulators

BLOCK DIAGRAM

V

CC

16V TO 10V

VA

OUT

10

V

REF

7.5V

V

REF

RUN

12

M

OUT

I

SENSE

8

7

CA

OUT

6

+

鈥?/div>

2.2V

7碌A

+

M1

V

SENSE

14

7.5V

鈥?/div>

EA

鈥?/div>

I

M

CA

I

A

25k

I

B

I

M

=

I

A2

I

B

200碌A

2

鈥?/div>

+

RUN

+

I

AC

9

+

0.7V

R

2R

7.9V

OVP

11

SS1

16

14碌A

+

鈥?/div>

OSC

16V

GND2

2

+

1V

鈥?/div>

CL

4 C

SET

R

SET

15

55%

DELAY

S

鈥?/div>

14碌A

SS2

13

PWMOK

鈥?/div>

7V TO

4.7V

+

鈥?/div>

+

NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE

AFTER PFC PULSE

19 I

LIM

V

C

18

50碌A

U

W

U

GND1

3

PK

LIM

V

CC

5

17

鈥?/div>

+

R

S

Q

GTDR1

1

R

Q

GTDR2

20

200ns

BLANKING

16V

1508 BD

1

標準包裝
38
類別
集成電路 (IC)
家庭
PMIC - PFC（功率因數(shù)修正）
系列
-
模式
平均電流
頻率 - 開關
100kHz
電流 - 啟動
-
電源電壓
27V
工作溫度
-40°C ~ 125°C
安裝類型
表面貼裝
封裝/外殼
20-SOIC（0.295"，7.50mm 寬）
供應商設備封裝
20-SOIC
包裝
管件

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LT1508ISW Datasheet

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