Version 3.0 4 03 April 2017
CCM-PFC
ICE3PCS01G
Pin Configuration and Functionality
1 Pin Configuration and Functionality
1.1 Pin Configuration
Figure 1 Pin Configuration (top view)
1.2 Pin Functionality
BOFO (Boost Follower setting)
An external DC voltage to this pin indicating the PWM
output power which can be set to enter the Boost
follower low step.
ISENSE (Current Sense Input)
The ISENSE Pin senses the voltage drop at the
external sense resistor (R
SHUNT
). This is the input signal
for the average current regulation in the current loop. It
is also fed to the peak current limitation block.
During power up time, high inrush currents cause high
negative voltage drop at R
SHUNT
, driving currents out of
pin 2 which could be beyond the absolute maximum
ratings. Therefore a series resistor (R
CS
) of around 50Ω
is recommended in order to limit this current into the IC.
SGND (Signal Ground)
The ground potential of the IC.
ICOMP (Current Loop Compensation)
Low pass filter and compensation of the current control
loop. The capacitor which is connected at this pin
integrates the output current of OTA6 and averages the
current sense signal.
FREQ (Frequency Setting)
This pin allows the setting of the operating switching
frequency by connecting a resistor to ground. The
frequency range is from 21kHz to 100kHz.
VB_OK (Bulk Voltage OK signal)
This pin is pulled up to 5V internally once the bulk
voltage is higher than 95% rated voltage and pulled
down to ground once VSENSE pin is lower than preset
VBTHL_EN threshold. This signal can enable the PWM
IC or control the inrush relay.
VBTHL_EN
An external voltage reference can be applied to
VBTHL_EN to set the turn-off threshold of VB_OK
signal. The IC can be shut down by pulling the pin lower
than 0.5V
VREF (Voltage Reference)
This pin is the 5V regulator output with a 5mA sourcing
current (minimum).
Pin Symbol Function
1 BOFO Boost Follower Setting
2 ISENSE Current Sense Input
3 SGND Signal Ground
4 ICOMP Current Loop Compensation
5 FREQ Switching Frequency Setting
6 VB_OK Bulk Voltage OK signal
7 VBTHL_EN PFC Enable Function
8 VREF Voltage Reference
9 BOP Brownout Protection
10 OVP Over Voltage Protection
11 VSENSE Bulk Voltage Sense
12 VCC IC Supply Voltage
13 GATE Gate Drive
14 PGND Power Ground
OVP
VSENSE
SGND
ISENSE
BOP
FREQ
ICOMP
P-DSO-14
GATE
PGND
VCC
VREF
VB_OK
VBTHL_EN
BOFO
