BD7690FJ 查看數據表（PDF） - ROHM Semiconductor

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BD7690FJ

Power Factor Correction Controller IC

ROHM Semiconductor 

BD7690FJ

Description of Block(s)

(1) VCC protection

This IC incorporates VCC UVLO (Under Voltage Lock Out) of the VCC pin. Switching stops at the time of VCC voltage drop.

(2) Power Factor Correction

The power factor improvement circuit is a voltage control method of Boundary Conduction Mode.

The outline operation circuit diagram is shown in Figure 4. The switching operation is shown in Figure 5.

Switching Operation

1. MOSFET is turned on, and IL increases

2. The IC compares VEO with Vramp, and MOSFET is off when the Vramp voltage higher than VEO

3. MOSFET is off, and IL decreases

4. The IC detects a zero point of the IL in ZCD and turns on MOSFET

ACIN

Diode

Bridge

IL

Auxiliary winding for zero

current detection

FRD

PFC OUT

OUT

ZCD

VS

EO

CS

GND

MOSFET

RCS

PFC OUT

Feedback Resistance

GND

OCP detected Resistance

Figure 4. Operation circuit outline

OUT

(Gate)

MOSFET

(Vds)

IL

V EO

Vramp

(Internal)

V ZCD

1

2

3

4

Figure 5. Switching operation timing chart

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TSZ22111 • 15 • 001

4/22

TSZ02201-0F2F0A200280-1-2

27. Mar. 2017 Rev.002

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