NCP1239CD65R2G View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NCP1239CD65R2G

Fixed Frequency Current‐Mode Controller for Flyback Converter

ON Semiconductor 

NCP1239

Vdd

Fault

IOTP

Vfault(clamp)

VFault(OVP)

VFault(OTP)

NC

Clock

600−ns time

constant

Up counter

RST

OVP/OTP

gone?

HV sample

BO

BO end

HV detection

& sampling

HV

4

Option for

OVP_VCC

BO

TSD

TSD

Dual HV startup

current source

Vdd

Rup

FB

Vskip

/4

Skip

Jitter

Foldback

Stop

Oscillator

65 kHz / 100 kHz

S

Q

Q

Latch

Vcc(reset)

Vdd

UVLO

Vcc logic

management

R

Clock

Vcc(reset)

OVP_VCC

TSD end

BO end

20us time

constant

VCC(OVP)

+

Slope

Compensation

Clamp

HV sample

OPP Current

Generation

Soft−start

Ramp

8 ms

SS end

PWM

Soft−start

Overcurrent

S

Q

Q

R

Latch

BO

TSD

Iopp

Vdd

Ibias

LEB

300 ns

LEB

CS

120 ns

OCP_flag

Dmax

OCP

Timer

64 ms

VLimit1

S

Q

Q

OCP_flag

VLimit2

PWM

Up counter

4

RST

R

OVP_VCC

(option)

OCP Fault

gone?

UVLO

Skip

Protection

Mode

Reset

Vcc(reset)

Auto−recovery

Timer

1s

Vcc

Drv

GND

Figure 2. Simplified Block Diagram

www.onsemi.com

4

Share Link: