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UM1351 Datasheet(PDF) 3 Page - Union Semiconductor, Inc.

Part # UM1351
Description  Hysteretic Buck High Brightness LED Driver with Internal Switch
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Manufacturer  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

UM1351 Datasheet(HTML) 3 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com Rev.01 Mar.2014
3/14
UM1351
Pin Description
Pin
Number
Symbol
Function
1
LX
Drain of NDMOS switch.
2
GND
Ground (0V).
3
VSET
Multi-function On/Off and brightness control pin:
Leave floating for normal operation
Drive to voltage below 0.2V to turn off output current
Drive with DC voltage (0.3V<VSET<2.5V) to adjust output
current from 12% to 100% of IOUTnom
Drive with PWM signal from open-collector or open-drain
transistor, to adjust output current. Adjustment range 1% to
100% of IOUTnom for f<100kHz.
Connect a capacitor from this pin to ground to increase
soft-start time.
(Default soft-start time=10μs. Additional soft-start time is
approximately 700μs/nF.)
4
ISENSE
Connect resistor RS from this pin to VIN to define nominal average
output current IOUTnom = 0.1/RS
5
VIN
Input voltage (6V to 35V). Decouple to ground with 10μF or higher
X7R ceramic capacitor close to device.
Absolute Maximum Ratings
Over operating free-air temperature (unless otherwise noted) (Note 1)
Symbol
Parameter
Value
Unit
VIN
Input Voltage Range
-0.3 to +35
V
VLX,
VISENSE
Voltages on LX, ISENSE
-0.3 to +35
V
VSET
VSET Pin Voltage
-0.3 to +6
V
θ
jA
Thermal Resistance (Junction to Ambient)
180
°C/W
θ
jC
Thermal Resistance (Junction to Case)
100
°C/W
TJ
Maximum Junction Temperature
+150
°C
TSTG
Storage Temperature Range
-55 to +150
°C
TL
Maximum Lead Temperature for Soldering 5
seconds
+300
°C
Note 1: These are stress ratings only and functional operation is not implied. Exposure to
absolute maximum ratings for prolonged time periods may affect device
reliability. All voltage values are with respect to network ground terminal.
Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Unit
VIN
Input Voltage Range
6.0
35
V
TA
Operating Ambient Temperature
-40
85
°C
TJ
Operating Junction Temperature
-40
150
°C


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