ICL5101_16 Datasheet, PDF (8/44 Pages) Infineon Technologies AG – Resonant controller IC with PFC for LED driver

Symbol
Pin
PFCVS
8
RFM
9
n.a.
10
n.a.
11
OVP
12
OTP
13
ICL5101
Pin Configuration and Description
Function
PFC voltage sensing
The intermediate circuit voltage (bus voltage) at the smoothing capacitor is
sensed by a resistive divider at this pin. The internal reference voltage for the
rated bus voltage is 2.5 V. There are further thresholds at 0.3125 V (12.5 %
of the rated bus voltage) for detection of open control loop and at 1.875 V
(75 % of the rated bus voltage) for detection of under voltage, and at 2.725 V
(109 % of the rated bus voltage) for detection of overvoltage. The
overvoltage threshold operates with a hysteresis of 100 mV (4 % of the rated
bus voltage). The bus voltage is sensed at 95 % (2.375 V) for detection of a
successful start-up. It is recommended to use a small capacitor between this
pin and GND as a spike suppression filter.
In run mode, PFC overvoltage stops the PFC gate drive within 5 µs. As soon
as the bus voltage is less than 105 % of the rated level, the gate drives are
enabled again. If the overvoltage lasts for longer than 625 ms, an inverter
overvoltage is detected and turns off the inverter gate drives also. This
causes a power-down and a power-up when V_BUS < 109 %.
A bus under- (V_BUS > 75 %) or inverter overvoltage during run mode is
handled as FAULT BUS. In this situation the IC changes to power-down
mode and generates a delay of 100 ms with an internal timer. Then start-up
conditions are checked and if valid, a further start-up is initiated. If start-up
conditions are not valid, a further delay of 100 ms is generated.
This procedure is repeated a maximum of seven times. If a start-up is
successful within these seven cycles, the situation is interpreted as a short
interruption of the mains supply.
Set minimum RUN frequency
A resistor from this pin to ground sets the operating frequency of the inverter
during run mode. The typical run frequency range is 20 kHz to 120 kHz @ -
40°C and 130kHz @ - 25°C. The set resistor R_RFM can be calculated
based on the run frequency f_RFM according to the equation:
R_RFM
5 10⁸ Hz

f _RUN
NOT Applicable: Leave PIN Open
NOT Applicable: SET to IC GND as short as possible
Over voltage protection of OUTPUT Voltage
In order to prevent overvoltage at the output stage – in the case of a floating
LED –overvoltage protection at pin 12 can be activated. Use a resistor and a
ceramic capacitor connected to the auxiliary winding in order to sense the
voltage level at the auxiliary winding. During run mode, the auxiliary winding
is monitored by a sensing current proportional to the auxiliary voltage. If the
peak-to-peak voltage at this pin exceeds a threshold of 210 µApp for longer
than 620 µs, overvoltage is detected. This function can be disabled by
setting pin 12 to GND.
Over temperature protection
In order to prevent over temperature of the system, activate the over
temperature protection at the OTP pin. Use a temperature-dependent
resistor and a ceramic capacitor connected to GND for activation. There is a
threshold of 3.2 V at the OTP pin during active run mode. If the voltage rises
above this threshold for longer than 620 µs, the IC detects over temperature
and changes to the latched fault mode. The latch mode is ended
automatically by power-up or UVLO. This function can be disabled by setting
pin 13 to GND.
Datasheet
8
Rev. 1.3, 2016-01-15