EN-822-300-V2P1-SIMPLE Datasheet, PDF (3/6 Pages) List of Unclassifed Manufacturers – Low THD, High Performance LED Driver

Fremont Micro Devices
PIN CONFIGURATION
FT822 Preliminary
Top View
FB ¹
8 _VCC
COMP ²
7 _GATE
MULT ³
6 _GND
CS ⁴
5 _AUX
Figure 2: Pin Assignments
TERMINAL DESCRIPTION
No. PIN
FUNCTION
Inverting input of error amplifier. The information on the output is fed into the pin through
1
FB
an opto-coupler. The pin also as an ON/OFF control input.
Output of the error amplifier. A compensation network is placed between this pin and FB
2 COMP ( pin #1) to achieve stability of the control loop and ensure high power factor and low
current THD.
Main input to the multiplier. This pin is connected to the rectified mains voltage via a
3 MULT
resistor divider and provides the sinusoidal reference to the current loop.
Input to the PWM comparator. The current flowing through the MOSFET is sensed by a
resistor, the resulting voltage together with line compensation voltage is applied to this pin
4
CS
and compared with an internal sinusoidal-shaped reference, generated by the multiplier, to
determine MOSFET’s turn-off.
Input from auxiliary winding sensing resistor divider for demagnetization timing,
5
AUX A negative-going edge after MOSFET’s minimum off time triggers MOSFET’s turn-on.
AUX double as OSCP and adjustable OVP latch protection input.
6
GND Ground.
7 GATE Gate drive output.
8
VCC Supply Voltage of both the signal part of the IC and the gate driver.
Table1
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DS822 –A2