FAN7528M

FAN7528M Datasheet

FAN7528 Dual-Output, Critical Conduction Mode PFC Controller

Part	Datasheet
FAN7528M	FAN7528M (pdf)

Related Parts	Information
FAN7528MX	FAN7528MX
FAN7528N	FAN7528N

PDF Datasheet Preview
FAN7528 Dual-Output, Critical Conduction Mode PFC Controller February 2007 FAN7528 Dual-Output, Critical Conduction Mode PFC Controller - Low Total Harmonic Distortion THD - Dual Output Voltage Control - Precise Adjustable Output Over-Voltage Protection - Open-Feedback Protection and Disable Function - Zero Current Detector - 160µs Internal Start-up Timer - MOSFET Over-Current Protection - Under-Voltage Lockout with 3.5V Hysteresis - Low Start-up 40µA and Operating Current 1.5mA - Totem-Pole Output with High State Clamp - ±400mA Peak Gate Drive Current - 8-Pin DIP or 8-Pin SOP - Adapter Related Application Notes - AN-6012 Design of Power Factor Correction Circuit Using FAN7528 The FAN7528 is an active power factor correction PFC controller for boost PFC applications that operates in critical conduction mode CRM . It uses voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MOSFET turn-off signal. Because the voltage mode CRM PFC controller does not need the rectified AC line voltage information, it can save the power loss of the input voltage sensing network necessary for the current mode CRM PFC controller. The FAN7528 provides the dual-output voltage control function without the AC line voltage sensing for adapter applications. It changes the PFC output voltage according to the AC line voltage. It provides protection functions such as over-voltage protection, open-feedback protection, over-current protection, and under-voltage lockout protection. The FAN7528 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65µA. Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs. Ordering Information Part Number FAN7528N FAN7528M FAN7528MX Operating Temp. Range -40°C to +125°C -40°C to +125°C -40°C to +125°C Pb-Free Yes Package 8-DIP 8-SOP 8-SOP Packing Method Rail Tape & Reel Marking Code FAN7528 FAN7528 Dual-Output, Critical Conduction Mode PFC Controller Typical Application Diagrams AC IN VAUX NAUX R2 RZCD FAN7528 CS COMP Figure Typical Boost PFC Application Internal Block Diagram VCC 8 UVLO 12V 8.5V Disable ZCD 5 6.7V 1.4V 1.5V Zero Current Detector 2.5V Ref Vref Internal Bias 160us Timer Drive Output 7 OUT OVP 2.66V 2.55V CS 4 MOT 3 40k 8pF 0.8V Ramp Signal Sawtooth Generator OCP Comparator 1V Offset

PDF Datasheet Preview

FAN7528 Dual-Output, Critical Conduction Mode PFC Controller

February 2007

FAN7528 Dual-Output, Critical Conduction Mode PFC Controller
- Low Total Harmonic Distortion THD - Dual Output Voltage Control - Precise Adjustable Output Over-Voltage Protection - Open-Feedback Protection and Disable Function - Zero Current Detector - 160µs Internal Start-up Timer - MOSFET Over-Current Protection - Under-Voltage Lockout with 3.5V Hysteresis - Low Start-up 40µA and Operating Current 1.5mA - Totem-Pole Output with High State Clamp - ±400mA Peak Gate Drive Current - 8-Pin DIP or 8-Pin SOP
- Adapter

Related Application Notes
- AN-6012 Design of Power Factor Correction Circuit Using FAN7528

The FAN7528 is an active power factor correction PFC controller for boost PFC applications that operates in critical conduction mode CRM . It uses voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MOSFET turn-off signal. Because the voltage mode CRM PFC controller does not need the rectified AC line voltage information, it can save the power loss of the input voltage sensing network necessary for the current mode CRM PFC controller.

The FAN7528 provides the dual-output voltage control function without the AC line voltage sensing for adapter applications. It changes the PFC output voltage according to the AC line voltage.

It provides protection functions such as over-voltage protection, open-feedback protection, over-current protection, and under-voltage lockout protection. The FAN7528 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65µA. Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs.
Ordering Information

Part Number FAN7528N FAN7528M FAN7528MX

Operating Temp. Range
-40°C to +125°C -40°C to +125°C -40°C to +125°C

Pb-Free Yes

Package 8-DIP 8-SOP 8-SOP

Packing Method Rail

Tape & Reel

Marking Code

FAN7528

FAN7528 Dual-Output, Critical Conduction Mode PFC Controller

Typical Application Diagrams

AC IN

VAUX NAUX

R2 RZCD

FAN7528

CS COMP

Figure Typical Boost PFC Application

Internal Block Diagram

VCC 8

UVLO
12V 8.5V

Disable

ZCD 5
6.7V
1.4V 1.5V

Zero Current Detector
2.5V Ref

Vref

Internal Bias
160us Timer

Drive Output
7 OUT

OVP 2.66V 2.55V

CS 4 MOT 3
40k 8pF
0.8V

Ramp Signal

Sawtooth Generator

OCP Comparator
1V Offset

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Datasheet ID: FAN7528M 513979