L8565 Datasheet, PDF (2/13 Pages) Unisonic Technologies – HIGH PERFORMANCE POWER FACTOR CORRECTION CONTROLLER IN CONTINUOUS

L8565
 PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
V_SENSE
1
8
V_CC
V_COMP
2
7
GATE
I_COMP
3
6
GND
FREQ
4
5
I_SENSE
Figure 1. Pin Configuration (top view)
 PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
V_SENSE
V_COMP
I_COMP
FREQ
I_SENSE
GND
GATE
V_CC
DESCRIPTION
The output bus voltage of the boost converter is sensed at this pin via a resistive divider.
The reference voltage for this pin is 5V.
This V_COMP Pin provides the compensation of the output voltage loop with a
compensation network to ground (see Figure 2). This also gives the soft start function
which controls an increasing AC input current during start-up.
At this pin the compensation components of the current loop are connected. The
capacitor which is connected at this pin integrates the output current of OTA2 and
averages the current sense signal.
A resistor connected to this pin sets the fixed switching frequency. The frequency range
is from 50kHz to 250kHz.
The pin senses the negative voltage drop at the external sense resistor (R1). 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
voltage drop at R1, driving currents into pin 5 which could be beyond the absolute
maximum ratings. Therefore a series resistor (R2) of around 220Ω is recommended in
order to limit this current into the IC.
This is the Ground pin.
The GATE pin is the output of the internal driver stage, which has a capability of 1.5A
source and sink current. Its gate drive voltage is clamped at 11.5V (typically).
The V_CC pin is the positive supply of the IC and should be connected to an external
auxiliary supply. The operating range is between 10V and 21V. The turn-on threshold is
at 11.2V and under voltage occurs at 10.2V.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R114-004.d