WS3252

WS3252

WS3252

WS3252

4/8

Steady,

Steady,

Steady,

Steady, keep

keep

keep

keep you

you

you

you advance

advance

advance

advance

Electrical

Electrical

Electrical

Electrical Characteristics

Characteristics

Characteristics

Supply

Supply

Supply

Supply Voltage

Voltage

Voltage

Voltage (VCC)

(VCC)

(VCC)

(VCC)

symbol

parameter

Test condition

Min

Typ

Max

Unit

I_VCC_ST

Start up current

VCC=13V

5

20

uA

I_VCC_OP

Operation Current

VCC=18V,INV=2V,CS=0V

2

3

mA

UVLO_ON

Turn on threshold Voltage

VCC falling

8.2

9.0

10.5

V

UVLO_OFF

Turn-off threshold Voltage

VCC rising

13.5

14.8

16.0

V

VCC_Clamp

VCC Zener Clamp Voltage

IVCC=10mA

28

29

31

V

OVP

Over

voltage

protection

Threshold

Ramp VCC until gate shut down

27

28.3

30

V

Error

Error

Error

Error Amplifier

Amplifier

Amplifier

Amplifier Section

Section

Section

Section

Vref_EA

Reference voltage for EA

1.97

2

2.03

V

Gain

DC gain of EA

60

dB

I_comp_max

Max.

Cable

compensation

current

INV=2V,COMP=0V

37.5

uA

Current

Current

Current

Current Sense

Sense

Sense

Sense Section

Section

Section

Section

TLEB

Leading edge Blanking Time

625

ns

Input impedance

50

kΩ

OCP control delay

110

ns

OCP threshold

0.88

0.91

0.94

V

T_ss

Soft start time

17

ms

Oscillator

Oscillator

Oscillator

Oscillator Section

Section

Section

Section

IC Maximum frequency

55

60

65

khz

Freq_Nom

System

nominal

switch

frequency

50

khz

Freq_startup

INV=0V,COMP=5V

14

khz

∆f/Freq

Frequency shuffling range

±6

%

Gate

Gate

Gate

Gate Driver

Driver

Driver

Driver Output

Output

Output

Output Section

Section

Section

Section

VOL

Output Low Level

Io=20mA

1

V

VOH

Output High Level

Io=20mA

6

V

V_clamp

Output Clamp Voltage Level

12

V

T_r

Output Rising Time

CL=0.5nF

650

ns

T_f

Output Falling Time

CL=0.5nF

40

ns

Note

Note

Note

Note: 1. Freq_Max indicates IC internal maximum clock frequency. In system application, the maximum operation

frequency of 60kHz nominal occurs at maximum output power or the transition point from CV to CC.