IS31LT3117 CURRENT REGULATOR Datasheet

IS31LT3117 Datasheet, PDF, Equivalent


Part Number

IS31LT3117

Description

4-CHANNEL CONSTANT CURRENT REGULATOR

Manufacture

ISSI

Total Page 16 Pages
Datasheet
Download IS31LT3117 Datasheet


IS31LT3117
IS31LT3117
53V, 350MA, 4-CHANNEL CONSTANT CURRENT REGULATOR WITH OTP
GENERAL DESCRIPTION
The IS31LT3117 is a 4-channel, linear regulated,
constant current LED driver which can provide 4 equal
currents outputs of up to 350mA per channel to drive
high brightness LEDs over an input voltage range of
6V to 53V, while maintaining an output leakage current
of less than 1µA. The output current is easily
programmed using a single, tiny external resistor. The
outputs of the IS31LT3117 can be connected in
parallel to allow greater than 350mA output current.
The IS31LT3117 also features a PWM input to enable
simple dimming control using a digital control signal.
The recommended frequency range of the PWM signal
is 4kHz ~ 100kHz.
The IS31LT3117 provides a unique over temperature
protection scheme. A hard shutdown which turns off all
LED currents occurs if the die junction temperature
exceeds the maximum value of 160°C. However, as
the die junction temperature rises up to over 130°C
(Typ.), the output current will begin to roll off at a rate
of -2.22%/°C (Typ.). If the die temperature continues to
rise above the hard shutdown temperature threshold,
the LED currents will drop to zero. When temperature
returns to 140°C (Typ.) or below, the hard shutdown
protection is released and the chip will function again.
The IS31LT3117 also has an optional 2.5V reference
voltage output which is able to supply up to 10mA (typ.)
output current. This voltage may be used to drive the
base of the external BJTs for higher current
applications in such case, driving for a wide varying
input voltage is needed.
The IS31LT3117 is offered in eTSSOP-16 package
with operating temperature range of -40°C to +125°C.
TYPICAL APPLICATION CIRCUIT
FEATURES
Preliminary Information
March 2015
6V to 53V input supply voltage range
Up to 1.4A total output current
Over temperature protections
Thermal current regulation above 130°C
±3% output current matching between channels
PWM dimming and shutdown control input
Optional 2.5V output to drive external standoff BJTs
Very few external components
APPLICATIONS
Industrial LED lighting
Low EMI lighting applications
Low-side constant current regulator
Figure 1 IS31LT3117 Directly Driving 4 LED Strings
Integrated Silicon Solution, Inc. – www.issi.com
Rev.0D, 03/10/2015
1

IS31LT3117
IS31LT3117
Figure 2 IS31LT3117 With Optional 2.5V Output Driving 4 External Standoff BJTs
Note 1: The 33µF output capacitor should be placed as close to the LED array as possible in order to minimize the parasitic inductor effect due
to the output wiring.
Note 2: The resistor RSET should be place as close to ISET and GND pins as possible.
Note 3: If you want less than four channels, the unused channel should be connected to GND.
Integrated Silicon Solution, Inc. – www.issi.com
Rev.0D, 03/10/2015
2


Features IS31LT3117 53V, 350MA, 4-CHANNEL CONSTAN T CURRENT REGULATOR WITH OTP GENERAL D ESCRIPTION The IS31LT3117 is a 4-channe l, linear regulated, constant current L ED driver which can provide 4 equal cur rents outputs of up to 350mA per channe l to drive high brightness LEDs over an input voltage range of 6V to 53V, whil e maintaining an output leakage current of less than 1µA. The output current is easily programmed using a single, ti ny external resistor. The outputs of th e IS31LT3117 can be connected in parall el to allow greater than 350mA output c urrent. The IS31LT3117 also features a PWM input to enable simple dimming cont rol using a digital control signal. The recommended frequency range of the PWM signal is 4kHz ~ 100kHz. The IS31LT311 7 provides a unique over temperature pr otection scheme. A hard shutdown which turns off all LED currents occurs if th e die junction temperature exceeds the maximum value of 160°C. However, as th e die junction temperature rises up to over 130°C (Typ.), the out.
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