PAM2804 Datasheet, PDF (2/11 Pages) Power Analog Micoelectronics – 1A Step-Down Constant Current, High Efficiency LED Driver

PAM2804
1A Step-Down Constant Current, High Efficiency LED Driver
Block Diagram
1.5M
OSC
SLOPE
COMP
+
IAMP
-
FB
FREQ
SHIFT
OSC
SQ
SWITCHING
RQ
LOGIC
-
EA
VIN
+
RS LATCH
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
COMP
EN
0.6VREF
SHUTDOWN
+
IRCMP
-
VIN
MAIN
SWITCH( PCH)
SW
SYNCHRONOUS
RECTIFIER (NCH)
GND
Pin Configuration & Marking Information
Top View
SOT23-5
EN 1
GND 2
5 ^FB
SW ³
4 _VIN
EE: Product Code
of PAM2804
X: Internal Code
Y: Year
W: Week
Pin Description
Nam e
VIN
GND
EN
FB
SW
Func tion
Chip main power supply pin
Ground
Enable cont rol input. Force this pin voltage above 1. 5V, enables the chip, and below
0.3V shuts down the device.
Feedback voltage to intern al error amplifier, the threshold voltage is 0.1V.
The drains of t he int ernal main and synchronous p ower MOSFET.
Power Analog Microelectronics, Inc
www.poweranalog.com
2
10/2010 Rev1.0