MAX16804ATP+T【PDF 3/10 页】IC LED DRIVR HIGH BRIGHT 20-TQFN

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High-Voltage, 350mA LED Driver with

Analog and PWM Dimming Control

ELECTRICAL CHARACTERISTICS (continued)

(V IN = V EN = 12V, C V5 = 0.1μF, I V5 = 0, CS- = GND, R SENSE = 0.56 Ω (see the Typical Operating Circuit), V DIM = 4V, T A = T J = -40°C

to +125°C, unless otherwise noted. Typical values are at T A = T J = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

THERMAL PROTECTION

Thermal-Shutdown Temperature

Thermal-Shutdown Hysteresis

T J(SHDN)

+155

°C

+5V REGULATOR

Output Voltage Regulation

0 ≤ I V5 ≤ 2mA

4.8

5.1

5.4

V5 Short-Circuit Current

V5 = 0V (Note 6)

Note 1: All devices are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed by design.

Note 2: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.

Note 3: Dropout is measured as follows:

Connect a resistor from OUT to CS+. Connect R SENSE = 0.56 Ω from CS+ to CS-. Set V IN = V OUT +3V (record V OUT as

V OUT1 ). Reduce V IN until V OUT = 0.97 x V OUT1 (record as V IN2 and V OUT2 ). Δ V DO = V IN2 - V OUT2 .

Note 4: I V5 = 0mA.

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 Ω from OUT to CS+.

Note 6: Thermal shutdown does not function if the output of the 5V reference is shorted to ground. Shorting V5 to GND disables the

output.

Typical Operating Characteristics

(V IN = 12V, V EN = V IN , C V5 = 0.1μF, I V5 = 0, CS- = GND, R SENSE = 0.56 Ω , connect OUT to CS+, V DIM = 4V, T A = +25°C, unless

otherwise noted.)

OUTPUT CURRENT

450

vs. TEMPERATURE

0.203

(V CS+ - V CS- ) vs. OUTPUT CURRENT

400

vs. INPUT VOLTAGE

400

350

300

250

200

150

100

I LOAD = 350mA

I LOAD = 200mA

I LOAD = 100mA

I LOAD = 35mA

0.202

0.201

0.200

0.199

0.198

0.197

0.196

0.195

0.194

V IN = 12V

350

300

250

200

150

100

I OUT = 350mA

I OUT = 100mA

0.193

-40 -25 -10 5 20 35 50 65 80 95 110 125

20 50 80 110 140 170 200 230 260 290 320 350

TEMPERATURE ( ° C)

OUTPUT CURRENT (mA)

INPUT VOLTAGE (V)

_______________________________________________________________________________________

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