BW6562A Datasheet, PDF (2/15 Pages) Bruckewell Technology LTD – High PFC LED Driver

BW6562A High PFC LED Driver
Pin Assignments and Ordering Information
Device
Packaging
BW6562A MST
SOP-8
Quantity of Tape & Reel
3000
Pin Descriptions
Pin No. Pin Name
1
INV
2
COMP
3
MULT
4
CS
5
ZCD
6
GND
7
GD
8
V_CC
Function
Inverting input pin of the error amplifier.
The information on the output voltage of the PFC controller is fed into this pin through a
resistor divider. The pin can also be used as chip enable/disable control pin.
Output pin of the error amplifier.
A compensation network is placed between this pin and INV to achieve stability of the
voltage control loop and ensure high power factor and low THD.
Main input to the multiplier.
This pin is connected to the rectified mains voltage via a resistor divider and provides the
sinusoidal reference to the current loop.
Current sense input pin to the internal PWM comparator.
The current flowing in the MOSFET is sensed through a resistor; the resulting voltage is
applied to this pin and compared with an internal sinusoidal-shaped reference, generated
by the multiplier, to switch on or off the external MOSFET. The pin is equipped with 200ns
leading-edge blanking for improved noise immunity.
Zero current detection pin.
Boost inductor’s demagnetization sensing input for transition-mode operation. A negative-
going edge triggers MOSFET’s turn-on.
Ground pin.
Current return for both the signal part of the IC and the gate driver.
Gate driver output pin.
The totem pole output stage is able to drive power MOSFET’s with a peak current of
600mA source and 800mA sink. The high-level voltage of this pin is clamped at about 12V
to avoid excessive gate voltages in case the pin is supplied with a high V_CC.
System power input pin.
Supply voltage of both the signal part of the IC and the gate driver. Upper limit is extended
to a maximum of 32V to provide a more headroom for supply voltage changes. This pin
has an internal 34V (min.) Zener diode to protect the IC itself from over-voltage transients.
© 2012 Bruckewell Technology Corp., Ltd.
2
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