AL1791/1792/1793/1794

Document number:37957 Rev. 3 - 2

8 of 18

www.diodes.com

September 2015

© Diodes Incorporated

AL1791/1792/1793/1794

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

UVLO Voltage

—

6.3

—

V

UVLO Hysteresis

—

300

—

mV

Shutdown Supply Current

Disabled

—

10

—

µA

Quiescent Supply Current

Enabled,

—

2

—

mA

EN Low Voltage

—

0

—

0.4

V

EN High Voltage

—

2.5

—

—

V

EN Internal Pulldown

0.35

—

3.5

μA

Digital PWM Low Voltage

—

—

—

0.3

V

Digital PWM High Voltage

—

2.5

—

—

V

Digital PWM Frequency

—

0.5

—

4

KHz

PWM Internal Pulldown

0.35

—

3.5

μA

ON

Minimum PWMx On Time

—

—

2.5

—

μS

—

—

0.4

—

V

—

—

1.5

—

V

Reference Voltage

—

1.47

1.5

1.53

V

Reference Current

—

0.125

—

mA

Regulation Current for Channel 1

—

250

—

mA

Regulation Current for Channel 2

—

250

—

mA

Regulation Current for Channel 3

(not for AL1792)

—

187.5

—

mA

Regulation Current for Channel 4

(not for AL1792/1793)

—

62.5

—

mA

—

250

—

mV

LEDx Leakage Current

—

0.1

2

μA

CY

LED Current Accuracy

-4.0

—

4.0

%

LED Short Protection Threshold

—

—

6

—

V

Short-detection Deglitch

Analog Dimming

—

2

—

mS

PWM Dimming (count the number of continuous cycles

when LED short is detected)

—

6

—

Cycles

Open-detection Deglitch

Analog Dimming

—

2

—

mS

PWM Dimming (count the number of continuous cycles

when LED open is detected)

—

6

—

Cycles

Soft-start Time

—

100

—

μS

Thermal Shutdown Threshold

—

160

—

°C

Thermal Recovery Threshold

—

100

—

°C

FAULTB Output Low Voltage

—

—

180

mV

FAULTB Leakage Current

—

—

1

μA

θ

JA

Thermal Resistance Junction-to-

Ambient

U-DFN4030-14 (Note 5)

—

55

—

°C/W

θ

JC

Thermal Resistance Junction-to-

Case

U-DFN4030-14 (Note 5)

—

12

—

°C/W

Note:

5. Device mounted on 2

” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground

plane.