AL5802-7 Diodes Inc., AL5802-7 Datasheet - Page 8

• Manufacturer Part Number: AL5802-7
• Description: LED Lighting Drivers Discrete LED Driver Driver,SOT26,3K
• Manufacturer: Diodes Inc.

Specifications of AL5802-7

• Product Category: LED Lighting Drivers
• Rohs: yes
• Input Voltage: 4.5 V to 30 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-26
• Minimum Operating Temperature: - 40 C
• Power Dissipation: 1 W

PWM dimming can be achieved by driving the EN pin. An external open-collector NPN transistor or open-drain N-channel MOSFET can be used
to drive the EN pin as shown in Figure 16. Dimming is achieved by turning the LEDs ON and OFF for a portion of a single cycle. The PWM
signal can be provided by a micro-controller or analog circuitry. Figure 17 is a typical response of LED current vs. PWM duty cycle on the EN pin.
AL5802
Document number: DS35516 Rev. 6 - 2
Fig. 16 Application Circuits for LED Driver with PWM Dimming Functionality
Fig. 17 Typical LED current response vs. PWM duty cycle for
60
50
40
30
20
10
0
0
R
EXT
20
= 13Ω at 400Hz PWM frequency
PWM DUTY CYCLE (%)
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40
8 of 11
-or-
60
80
100
© Diodes Incorporated
December 2012
AL5802