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High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V EN = +12V, C V5 = 0.1μF to GND, I V5 = 0, V CS- = 0V, V DIM = +4V, connect R SENSE = 0.58 ? between CS+ and CS-.
T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
+5V REGULATOR
+159
24
°C
°C
Output Voltage Regulation
V V5
(Note 6)
4.85
5.00
5.20
V
V5 Short-Circuit Current
V V5 = 0V (Note 7)
15
mA
Note 2: All devices are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 3: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 4: Dropout is measured as follows:
Connect R O = 27 ? from OUT to CS+. Connect R SENSE = 0.58 ? from CS+ to CS-. Set V IN = +12V (record V OUT as V OUT1 ).
Reduce V IN until V OUT = 0.97 x V OUT1 (record as V IN2 and V OUT2 ). ? V DO = V IN2 - V OUT2 .
Note 5: t ON time includes the delay and the rise time needed for I OUT to reach 90% of its final value. t OFF time is the time needed
for I OUT to drop below 10%. See the Typical Operating Characteristics. t ON and t OFF are tested with 13 ? from OUT to CS+.
Note 6: Current regulation varies with V5 load (see the Typical Operating Characteristics).
Note 7: Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
Typical Operating Characteristics
(V IN = V EN = +12V, T A = +25°C, unless otherwise noted.)
450
OUTPUT CURRENT
vs. TEMPERATURE
0.208
(V CS+ - V CS- )
vs. OUTPUT CURRENT
400
OUTPUT CURRENT
vs. INPUT VOLTAGE
400
350
I LOAD = 350mA
0.206
350
300
300
250
200
150
100
50
0
I LOAD = 200mA
I LOAD = 100mA
I LOAD = 35mA
0.204
0.202
0.200
0.198
250
200
150
100
50
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
20 50 80 110 140 170 200 230 260 290 320 350
0
5
10
15
20
25
30
35
40
TEMPERATURE ( ° C)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
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3
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