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ICE5QSAG

Quasi-Resonant Controller

Infineon Technologies 

Quasi-Resonant Controller

Pin Configuration and Functionality

1

Pin Configuration and Functionality

The pin configuration is shown in Figure 2 and the functions are described in Table 2.

FB

1 PG-DSO-8 8

GND

VIN

2

7

VCC

CS

3

6

SOURCE

ZCD

4

5

GATE

Figure 2

Pin Configuration

Table 2

Pin

1

2

3

4

5

6

7

8

Pin Definitions and Functions

Symbol

FB

VIN

CS

ZCD

Function

Feedback & Burst entry/exit control

FB pin combines the functions of feedback control, selectable burst entry/exit control

and overload/open loop protection.

Input Line OVP & Brownout

VIN pin is connected to the bus via resistor divider (see Figure 1) to sense the line

voltage. This pin combines the functions of input Line OVP, Brownout, minimum

and maximum ZC count setting for low and high line.

Current Sense

The CS pin is connected to the shunt resistor for the primary current sensing

externally and to the PWM signal generator block for switch-off determination

(together with the feedback voltage) internally.

Zero Crossing Detection

ZCD pin combines the functions of start up, zero crossing detection and output

over voltage protection. During the start up, it is used to provide a voltage level to

the gate of power switch Q1 (see Figure 1) to charge VCC capacitor.

GATE

Gate Drive Output

This output signal drives the external main power switch Q1 (see Figure 1).

SOURCE

VCC

GND

SOURCE

The SOURCE pin is connected to the source of external power switch Q1 (see

Figure 1) which is in series connection with internal low side MOSFET and internal

VCC diode D.

VCC(Positive Voltage Supply)

The VCC pin is the positive voltage supply to the IC. The operating range is

between VVCC_OFF and VVCC_OVP.

Ground

The GND pin is the common ground of the controller.

Datasheet

4 of 27

V 2.1

2020-02-03

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