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BD7692FJ-E2

Power Factor Correction Controller IC

ROHM Semiconductor 

BD7692FJ

Description of Blocks

1 VCC Protection

This IC has 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 1. The switching operation is shown in Figure 2.

Switching Operation

1. MOSFET is turned on, and IL increases.

2. The IC compares VEO with VRAMP slope decided in RT pin, and MOSFET is off when the VRAMP voltage higher than VEO.

3. MOSFET is off, and IL decreases.

4. The IS pin detects a zero point of the IL and turns on MOSFET.

ACIN

Diode

Bridge

IL

VDS

COIL

PFC OUT

OUT

VS

IS

EO

GND

RIS

MOSFET

Zero current and

OCP detection

Figure 1. Operation Circuit Outline

OUT

(Gate)

MOSFET

(VDS)

I L IL

VEO

VRAMP

(Internal)

VZCD

1

2

3

4

Figure 2. Switching Operation Timing Chart

PFC OUT

Feedback Resistance

GND

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TSZ22111 • 15 • 001

3/22

TSZ02201-0F2F0A200320-1-2

04.Oct.2018 Rev.001

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