ICE2HS01G Datasheet, PDF (7/29 Pages) Infineon Technologies AG – High Performance Resonant Mode Controller

High Performance Resonant Mode Controller
ICE2HS01G
Pin Configuration and Functionality
temperature protection. In addition, the burst mode can be enabled/disabled by connnecting different capacitance
to this pin. IC will do the set up function the first time VCC rise from a voltage lower than internal reference.
SS (soft start)
SS pin connects an external capacitor C_SS to GND and a resistor R_OCP to FREQ pin. An internal switch will first
fully discharge C_SS before soft start or autorestart, which guarantee high operating frequency for soft start or
restart. R_OCP determines the max operating frequency. During softstart, a internally current source is used to
charge up the softstart capacitor. This current is big at first, it will be reduced once the SS voltage increases to
some level and it will be further reduced if SS voltage increases to a higher level. In such a way, the smooth rising
of output voltage can be achieved. Also, the soft start during time is mainly determined by the C_SS. In case of over
current condition, SS pin will be discharged through 2 internal resistors toward zero votlage. As a result, the
operating frequeny will be increased and the highest frequency in this case is determined by the equivalent
resistance of R_FMIN and R_OCP in parallal.
LOAD (Load condition detection)
A voltage divider, consist of R_FT1 and R_FT2, is connected to the collector of optocoupler, and this divided voltage
is delivered to LOAD pin. If LOAD pin voltage is lower than a certain threshold, 0.1V, IC will stop switch. Only if
the voltage level is higher than 0.15V, IC will resume swith again.
A second function of this pin is to detect the over-load or open-loop faults. Once the voltage on this pin is higher
than 1.8V, IC will start internal and external timer to determine whether entering the protection mode.
The third function on this pin is to disable SR during light load mode. When the voltage on load pin is too low, IC
will stop the SR gate drives.
FREQ (Operating frequency)
This pin provides a precise 2V reference and a resistor R_FMIN connected from this pin to GND, which defines a
current that is used to determin the minimum operating frequency. In order to regulate the converter output voltage
by changing the operating frequency, the phototransistor of an optocoupler is connected to this pin through
resistor R_REG.
Delay (Advance delay time setting)
For SR purpose, the delay time between primary side switch’s gate off signal and secondary side SR switch’s gate
off signal can be adjusted by a resistor R_delay connected to Delay pin.
TD (Primary dead time setting)
In order to provide the design flexbility, the dead time between two primary switches can be adjusted by external
resistor R_TD1 connected from Vref pin to TD pin. The TD pin voltage is regulated at 2V. The current flow into this
pin determines the dead time, which ranges from 100ns to 1000ns.
Vmc (Voltage levels for entering and leaving missing cycle mdoe)
The voltages on this pin is used to setting the levels, on CL pin, which IC enters missing cycle operation mode or
leaves missing cycle mode. Internally, a current source from internal power supply to this pin is provided which
will generate the hysteresis voltage between entering and leaving missing cycle voltages.
Vref (Reference voltage ouput)
This pin is the output of refernce voltage, which is tight regulated at 5V. This reference voltage supplies the bias
current for dead time setting, and also setting of resonant voltage, missing cylce voltages.
Vres (resonant voltage setting)
The voltage on this pin is used for determination the operation mode of the half-bridge LLC resonant converter,
CCM or DCM. There is no turn-on delay between secondary and primary gate signals if the converter is in DCM
mode. If the converter is in CCM mode, IC will add the turn-on delay when the Vres voltage is lower than VINS
pin voltage.
VINS (mains input voltage sense)
Version 2.0
7
11 May 2010