ICE2QS03G_14 Datasheet, PDF (7/24 Pages) Infineon Technologies AG – Active burst mode for low standby power

Quasi-Resonant PWM controller
ICE2QS03G
Pin Configuration and Functionality
1
Pin Configuration and Functionality
1.1
Pin Configuration with PG-
DSO-8
Table 1 Pin configuration
Pin Symbol Function
1
ZC Zero Crossing
2
FB Feedback
3
CS Current Sense
4 GATE Gate Drive Output
5
HV High Voltage input
6
N.C. Not Connected
7 VCC Controller Supply Voltage
8 GND Controller Ground
1.2
Pin Functionality
ZC (Zero Crossing)
At this pin, the voltage from the auxiliary winding
after a time delay circuit is applied. Internally, this
pin is connected to the zero-crossing detector for
switch-on determination. Additionally, the output
overvoltage detection is realized by comparing the
voltage Vzc with an internal preset threshold.
FB (Feedback)
Normally an external capacitor is connected to this
pin for a smooth voltage V_FB. Internally this pin is
connected to the PWM signal generator block for
switch-off determination (together with the current
sensing signal), to the digital signal processing
block for the frequency reduction with decreasing
load during normal operation, and to the Active
Burst Mode controller block for entering Active
Burst Mode operation determination and burst ratio
control during Active Burst Mode operation.
Additionally, the open-loop / over-load protection is
implemented by monitoring the voltage at this pin.
CS (Current Sense)
This 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.
Moreover, short-winding protection is realized by
monitoring the voltage V_cs during on-time of the
main power switch.
GATE (Gate Drive Output)
This output signal drives the external main power
switch, which is a power MOSFET in most case.
Figure 2 Pin configuration PG-DSO-8 (top
view)
HV (High Voltage)
The pin HV is connected to the bus voltage
externally and to the startup cell internally. The
current through this pin pre-charges the VCC
capacitor with constant current once the supply bus
voltage is applied.
VCC (Power supply)
VCC pin is the positive supply of the IC. The
operating range is between V_VCCoff and V_VCCOVP.
GND (Ground)
This is the common ground of the controller.
Data Sheet
7
V2.3, 2014-03-06