SN3135
March 2009 Ver1.0 1 SI-EN Technology
Main/sub dual-channel LED driver
Description
SN3135 is a main/sub dual-channel LED driver. When
the main channel works，it is a constant current source
driving the main LED and the current is set by an
external resistor connected to the I
SET
pin. It needs only
0.1v dropout voltage for 200mA output current. When
the sub-channel works，the chip would pull down sub
LED’s cathode to ground.
Normally there is only one channel on, the main channel
and the sub channel can switch with each other.
Sweeping power supply from high voltage to low voltage,
main channel switches to sub-channel while UV pin is
below undervoltage threshold 1.17V (SN3135-01
typical)or 1.23V(SN3135-02 typical); Sweeping power
supply from low voltage to high voltage , the
sub-channel switches to the main channel while UV pin
is 80mV (typical)higher than the undervoltage threshold.
Additionally, the main channel has short protection
function, when the main LED is shorted，the chip would
switch to sub-channel automatically.
Features
z Power supply undervoltage detect
z Main channel short protection
z Over-temperature protection
z Input voltage range: 2.7V~5.5V
z main and sub channel current set by external resistor
z Main channel Vdp=0.1V
z Low quiescent current
z Assembled in SOP-8 package
Application
z Miner lamp
z Other LED lighting
Typical application circuit
Figure1
.
SN3135
March 2009 Ver1.0 2 SI-EN Technology
Pin configurations
Package Pin Configurations
SOP-8
Pin description
Name PinNo. description
V
CC
1 Power supply input
UV 2 The pin detects under-voltage. Decouple to ground with 0.1uf capacitor
close to device
I
SET
3 The pin sets the main LED current with external resistor
GND 6 The pin connects to ground.
MAIN 7 Connect to the cathode of main LED
SUB 8 Connect to the cathode of sub LED
NC 4，5 Not connect
Ordering Information
Order number Quantity per reel Operating Temperature range
V
UV
SN3135ID08E-01
2,500
-40℃ to 85℃
1.13V~1.21V
SN3135ID08E-02
2,500
-40℃ to 85℃
1.19V~1.26V
SN3135 -
I D 08 E - 0X
Bin Code
01: bin 1 Vuv=
1.13V~1.21V
02: bin 2 Vuv=
1.19V~1.26V
Environmental code
E: ROHS
Pin code
08: 8 pins
Package Type
D:SOP-8
Operating temperature range
I: Industry Standard