NCP1397A datasheet(3/27 Pages) ONSEMI

Part #	NCP1397A

Description	High Performance Resonant Mode Controller with Integrated High-Voltage Drivers

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1397A/B, NCV1397A/B

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Figure 2. Internal Circuit Architecture (NCP1397A)

Vref

Rt

VDD

C

IDT

−−

+

DT Adj.

I = Imax for Vfb = 5.3 V

I = 0 for Vfb < Vfb(min)

Imin

VFB

VFB(o )

Vref

VDD

Imax

VFB = 5

Fmax

VDD

Itimer1

−−

+

Timer

+

Vref

PON Reset

Vtimer OFF

Reset

SS(dis)

FB

RFB

−−

+

VFB(fault)

−−

+

G = 1

> 0 only

V=V (FB) −− VFB(min)

IDT

Vref

VDD

+

VFB(min)

DT

Deadtime

Adjustment

VDD

−−

+

BO

+

VBO

−−

+

Vlatch

Clk

D

S

Q

R

S

Q

R

PON Reset

50% DC

Temperature

Shutdown

PON

Reset

Fault

Timeout

Fault

Vref

BO

Reset

FF

+

−−

+

Vref Skip/Disable

Skip/

Disable

VCC

Timeout

Fault

Mlower

GND

IBO

20 ns Noise

Filter

+

−−

Fault

+

Vref(fault)

NC

VBOOT

Mupper

HB

UVLO

Fast

Fault

+

−−

+

Vref(OCP)

Vdd

Itimer2

Level

Shifter

20 ms Noise

Filter

Fault

PON Reset

Enable

(if Vfb<0.3V)

20 ms Noise

Filter

1 ms Noise

Filter

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