MIC3263 Datasheet, PDF (3/32 Pages) Micrel Semiconductor – Six-Channel WLED Driver for Backlighting Applications with Flicker-Free Dimming

Micrel, Inc.
Ordering Information
Part Number
MIC3263YML
Junction Temperature Range⁽¹⁾
–40° to +125°C
Note:
1. Other Voltage available. Contact Micrel for detail
Pin Configuration
MIC3263
Package
24-Pin 4mm x 4mm MLF®
Lead Finish
Pb-Free
24-Pin 4mm x 4mm MLF®
Pin Description
Pin Number
1
Pin Name
FSW
2
RSLP
3
OVPS
4
OVP
5
MODE
6
DFS
7
COMP
8
DRC
9
CINT
Pin Function
Booster Switching Frequency:
Connect a resistor-to-GND to set the switching frequency from 400kHz to 1.8MHz.
Slope Compensation Adjustment Resistor.
OVP and FB voltage divider virtual ground.
Overvoltage Protection Input. This is also the FB voltage for the error amp in the Boost stage.
Select a dimming frequency range:
0V for 100Hz to 2kHz and V_DD for 1.5kHz to 20kHz. If DFS is connected to V_DD, MODE pin is
used for an external dimming pulse input.
Set a dimming frequency from 100Hz to 20kHz through an external resistor and MODE.
Requires a series RC for stability.
If DFS is connected to V_DD, an external dimming pulse can be applied to the MODE pin.
Loop Compensation connect R and C-to-GND.
Dimming Ratio Control Pulse:
Its duty cycle is converted to one of 16 dimming levels. The duty-cycle difference between two
adjacent levels is ±6.25%. And about 2% duty-cycle hysteresis exists between two adjacent
levels to eliminate dimming flicker.
DRC can be from 100Hz to 40kHz.
Integration Cap:
Use a 0.01µF for 2kHz to 20kHz and 0.1µF for 100Hz ─ 2kHz.
January 2010
3
M9999-012110