AL6562

Document Number: DS37542 Rev. 2 - 2

2 of 16

www.diodes.com

February 2015

© Diodes Incorporated

AL6562

Pin Descriptions

Pin Number

Pin Name

Brief Description

1

INV

Inverting Input Pin of the Internal Error Amplifier

This pin is connected externally via a resistor divider from the regulated output voltage. It can provide

input to inverting input of internal error amplifier. This pin can also be used as ENABLE/DISABLE

control input.

2

COMP

Output from Error Amplifier

A feedback compensation network consisting of resistor and capacitor connects between INV (Pin1)

and this pin to reduce the bandwidth and achieve stability of the voltage control loop and ensure high

power factor and low THD.

3

MULT

Input to the Internal Multiplier

This pin connects to the rectified mains voltage through external resistor divider to provide a sinusoidal

voltage reference for the control current loop.

4

CS

Current Sense Connecting to External Resistor for Current Feedback

The current flowing in the MOSFET is sensed through a resistor, the resulting voltage is applied to this

pin and compared with an internal sinusoidal-shaped reference generated by the multiplier to determine

MOSFET’s turn-off. This pin has an internal Leading-Edge-Blanking of about 200 nanoseconds to

improve noise immunity.

5

ZCD

Zero Current Detection

This pin takes input from inductor

’s demagnetization sensing to achieve zero current detection, required

for Transition Mode (TM) operation. A negative-going edge triggers turn-on of MOSFET.

6

GND

System Ground

Ground for circuit. Current return for both the signal circuitry and the gate drive stage.

7

GD

Gate Driver Output

This pin is able to drive external MOSFET. The totem-pole output stage is able to drive MOSFET with a

peak current of 600mA/800mA for source and sink capability respectively. The high level voltage of this

higher voltage.

8

System Power Input Pin

This pin is for supply voltage of both the signal part and gate driver of the IC. Upper limit is extended to

a maximum of 22V to provide more headroom for supply voltage changes. This pin has an internal 25V

Zener to protect the IC itself from overvoltage transients.

Functional Block Diagram

GD

GND

ZCD

INV

VCC

Multiplier

Overvoltage

Detection

Voltage

Regulat ion

St arter

Driver

R

S

Q

Internal

Supply 7.5V

2.1V

1.6V

Vref

R1

R2

COMP

MULT

CS

Zero Current

Detector

1

8

5

6

7

4

3

2

VCC

UVLO

40K

10 pF

24V

INV_Disable

INV_Disable

0.47 V/0.3V

ZCD_Disable

Upper &

Lower

Clamp

1.7

V