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AL8811

Boost/Buck/Inverting DC-DC CONVERTER


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AL8811 pdf
AL8811
Boost/Buck/Inverting DC-DC CONVERTER
Description
The AL8811 is a monolithic control circuit containing the primary
functions required for DC-to-DC converters. These devices consist of
an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit, driver
and high current output switch. This series is specifically designed for
incorporating in Boost, Buck and voltage-inverting applications with a
minimum number of external components.
Pin Assignments
 
Features
Operation from 3.0V to 20V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.6A
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3) 
MSOP-8
Applications
Low Voltage LED Lighting such as MR-16
General Purpose DC-DC Converter
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Application Diagram
Electronic Transformer compatible MR16 lamp Simplified Schematic
AL8811
Document number: DS36090 Rev. 2 - 2
1 of 11
www.diodes.com
June 2013
© Diodes Incorporated



No Preview Available !

AL8811 pdf
AL8811
Pin Descriptions
Pin Name Pin Number
Descriptions
Current
Switch+
Current
Switch-
Internal switch transistor collector:
1 Connect to Inductor for boost converter.
Connect to VCC for Buck or Inverting converter
Internal switch transistor emitter:
2 Connect to GND for boost converter
Connect to Inductor for buck or inverting converter
CT 3 Timing Capacitor to control the switching frequency
GND
4
Feedback
5 Feedback pin for inverting input of internal comparator
VCC
6 Supply voltage pin
Current
Sense
7
Peak Current Sense Input by monitoring the voltage drop across an external current sense
resistor to limit the peak current through the switch
Current
Drive
8
Current drive collector:
Normally connected to VCC directly or via a resistor.
Functional Diagram
AL8811
Document number: DS36090 Rev. 2 - 2
2 of 11
www.diodes.com
June 2013
© Diodes Incorporated



Part Number AL8811
Description Boost/Buck/Inverting DC-DC CONVERTER
Maker Diodes - Diodes
Total Page 11 Pages
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