NCP1338(2010) 查看數據表（PDF） - ON Semiconductor

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NCP1338
(Rev.:2010)

PWM Current-Mode Controller for Free Running Quasi-Resonant Operation

ON Semiconductor 

NCP1338

BO

FB

CS

GND

-

+

5V

+

+

+

3V -

SQ

R

DISABLE

Vdd

PERM. LATCH

Vdd

VCC < 4 V

TSD

8 ms

timeout

TSD

35 ms

max Toff

Toff

10 mA

S

Ton

Startup

Soxyless

Clk

Q

VBO

500 mV

+

+-

BOK

OVP

Ton

7.5 ms min

period

D

Q

Toff

SStart

R1 R2

DRV

100 mV

Vdd 130 mV

+

Skip

-

+

OK

SSkip

Ton

67 ms

max Ton

3V

VBO

Ton

4k

20 kHz

Low−pass

filter

Vdd

500 mV

FAULT

if Zener

activated

Setpoint

70 mA x VBO − 35 mA

-

+

CS

comp.

PERM.

LATCH

300 ms

Soft−Skipt

4 ms

soft−start

SSkip

SStart

TSD

FAULT

Management*

350 ns

LEB

2p

FAULT

(*If FAULT duration > 80 ms = > STOP

Restart when 2nd time VCC = VCCon)

DRV

OK

12 V

10 V

5V +

OVP

5.5 ms

blanking

VCC

Inhib

Soxyless

demag

detection

Soxyless

+

-

9.5 mA or

600 mA

-

+

+

18.6 V

DRV

HV

VCC

Figure 2. Internal Circuit Architecture

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