AL8806MP8-13 Diodes Inc, AL8806MP8-13 Datasheet - Page 9

• Manufacturer Part Number: AL8806MP8-13
• Description: LED Drivers HIGH EFF 30V 1.5A 6V TO 30V 8 LED
• Manufacturer: Diodes Inc
• Series: -r

Specifications of AL8806MP8-13

• Constant Current: Yes
• Constant Voltage: -
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: -
• Frequency: 1MHz
• Voltage - Supply: 6 V ~ 30 V
• Voltage - Output: 30V
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
• Operating Temperature: -
• Lead Free Status / Rohs Status: Details

AL8806
HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER
Applications Information
(continued)
Soft Start
The AL8806 does not have in-built soft-start action – this provides very fast turn off of the output the stage improving PWM
dimming accuracy; nonetheless, adding an external capacitor from the CTRL pin to ground will provide a soft-start delay. This
is achieved by increasing the time taken for the CTRL voltage to rise to the turn-on threshold and by slowing down the rate of
rise of the control voltage at the input of the comparator. Adding a capacitor increases the time taken for the output to reach
90% of its final value, this delay is 0.1ms/nF, but will impact on the PWM dimming accuracy depending on the delay
introduced.
Figure 4. Soft start with 22nF capacitor on CTRL pin (V
= 30V, I
= 667mA, 1 LED)
IN
LED
AL8806
9 of 14
March 2011
www.diodes.com
© Diodes Incorporated
Document number: DS35144 Rev. 1 - 2