BW7383 Datasheet, PDF (6/8 Pages) Bruckewell Technology LTD – 6 Pin Non-isolation Buck current control IC with High PFC for LED Lighting

BW7383
6 Pin Non-isolation Buck current control IC with High PFC for LED Lighting
APPLICATION INFORMATION
1. Function Description
The BW7383 is a constant current Buck
controller with PFC function for LED lighting
applications.
The controller is BCM operation with constant
on time based regulator design to achieve high
power factor performance.
The BW7383 is built-in functions of VCC over
voltage protection, open LED protection, short LED
protection, over temperature protection, primary
side current limit, and gate clamp within.
The BW7383 sense output current from CS pin
to get the output current information. By the system
close loop feedback. The avarge output current can
express as below.
IOUT = 0.2 / Rs
2. Pin Detail
2-1. COM
This is the output of the Gm amplifier. Connect
with a suitable RC network to ground.
2-2. GND
GND is the reference node of internal circuit.
2-3. CS
MOSFET current signal sensing for LED
constant current control and current limit setting
function
ICS(Limit) = ^1.25
RS
2-4. OUT
Gate drive for external MOSFET switch and is
built-in Gate clamp function.
2-5. VCC
Power supply for the controller during normal
operation. The controller will start up when VCC
reaches 18.4V (typical) and will shut-down when
VCC voltage is below 9.8V (typical). A decoupling
capacitor should be connected between the VCC
and GND pin as close as possible.
The BW7383 perform VCC over voltage
protection though VCC pin. Once VCC pin exceed
in 32.8V, BW7383 turns off and latch out the
MOSFET switcher until VCC under V_{CC_OFF}.
2-6. DMG
The DMG pin can sense output information to
depart from start up voltage(V_{O_STR}) and protection
voltage(V_OVPS). Besides, the Internal resistance of
DMG pin is 1.6Mohm.
When DMG sense voltage under V_{O_STR}, the
circuit will work on short circuit protection,and the
system switching frequency F_STR=1/Tstr.
When DMG sense voltage over V_OVPS, the
circuit will work on over voltage protection, it will
latch out off until VCC under V_{CC_OFF}.
Rev 1.1 Jan. 2014
6