ICE2HS01G Datasheet, PDF (8/29 Pages) Infineon Technologies AG – High Performance Resonant Mode Controller

High Performance Resonant Mode Controller
ICE2HS01G
Pin Configuration and Functionality
The mains input voltage is fed to this pin via a resistive voltage divider. If the voltage on VINS pin is higher than
the threshold V_INSON, IC will start to operate with softstart when VCC increases beyond turn on threshold. During
operation, if the voltage on this pin falls below the threshold V_INSON, IC will stop switching until the voltage on this
pin increases again.
CS (current sense)
The current sense signal is fed to this pin. Inside the IC, three comparators are provided for 3 level OCP function.
If the voltage on CS pin is higher than the first threshold, IC will increase the switching frequency to limit the
maximum output power of the converter. If the voltage on this pin exceeds the second threshold, IC will further
increase the switching frequency to a higher value with higher frequency rising slope. If the voltage on this pin
exceeds the third threshold, IC will be latched off immediately.
A second function of CS pin is to sense the output power level. If CS voltage is lower than some preset value on
Vmc pin, IC will enter the missing cycle mode to improve the converter efficiency.
Protection function is also integrated on this pin for synchoronous rectification. IC will stop the SR gate drives if
the CS votlage is too high or it drops too fast.
CL (current sense average level)
A resistor R_CL is connected between CL pin and SRD pin. This resistor determines how much the synchrnous
rectifcation on duration is changed according to load condition. Internally, CL pin voltage is proportional to the CS
pin voltage. A clamp circuit set the maximum voltage of 1.95V on CL pin. A capacitor is recommended to be put
between this pin and ground. This can filter out the high ripple component on CS voltage and therefore decrease
the variation of SR dirves’ on time versus output load.
SRD (SR Disable input)
This pin is used to disable SR function, by pulling down SR pin to zero, in case of softstart, hold up time, OCP or
any other conditions specified by customers. A limited current source is built internally which generates a constant
2V voltage on SR pin. The current, depending on the external resistors R_SRD, and also R_CL and V_CL if connected,
is used to charge the internal capacitor. Therefore, the on time of secondary gate drives can be set by choosing
different R_SRD during design or different R_CL which sets the dependence of the current on the current sense
voltage.
GND (ground)
IC common ground.
SLG (Low side SR gate drive)
This pin delivers gate drive signal for low side synchornous rectification switch.
SHG (High side SR gate drive)
This pin delivers gate drive signal for high side synchronous rectification switch.
LG (low side gate drive)
This pin delivers gate drive signal for primary low side switch.
HG (high-side gate drive)
This pin delivers gate drive signal for primary high side switch.
VCC (IC power supply)
Supply voltage of the IC.
Version 2.0
8
11 May 2010