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AL1788 Datasheet

LOW STANDBY POWER PFC CONTROLLER

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AL1788
LOW STANDBY POWER PFC CONTROLLER
Description
The AL1788 is a high performance AC/DC Power Factor Correction
(PFC) controller targeting at LED lighting applications. Based on
Primary Side Regulation (PSR) implementation, AL1788 does not
require opto-coupler and any secondary feedback circuit to save overall
BOM cost. It operates at Quasi-Resonant (QR) mode where MOSFET
is turned on at the valley of the drain voltage, which minimizes switching
loss to result in high efficiency.
With either Flyback or Buck topology, AL1788 system supports high
efficiency, high Power Factor (PF>0.9) and low Total Harmonic
Distortion (THD <20%) for universal input at wide loading range (50%
loading to 100% loading)
Pin Assignments
Top View
CS 1
GND 2
COMP 3
6 OUT
5 VCC
4 FB
The AL1788 features low start-up current, low operation current and low
standby power. It has rich protection features including Over Voltage
Protection (OVP), Short Circuit Protection (SCP), Over Current
Protection (OCP) and Over Temperature Protection (OTP).
The AL1788 is available in SOT26 (SC74R) package for the controller.
Features
PSR Implementation Based on Flyback and Buck Topology
Universal AC Voltage Input for Constant Voltage (CV) Regulation
Valley Detection for Primary MOSFET Switch to Achieve Low
Switching Loss and High Efficiency
High PF (>0.9) and Low THD (<20%) for Wide Loading Range
(50% to Full Loading)
Internal Protections:
Under Voltage Lockout (UVLO)
Over Voltage Protection (OVP)
Over Current Protection (OCP)
Output Short Protection (OSP)
Over-Temperature Protection (OTP): Thermal Shutdown and
Auto Thermal Recovery
Low Standby Power
Low System BOM Cost
Controller with External MOSFET
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
General LED Lighting
Smart Connected LED Light Bulbs
Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling
Lights
High PFC and low THD power supply
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.
AL1788
Document number: DS39401 Rev. 1 - 2
1 of 13
www.diodes.com
October 2017
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL1788 Datasheet

LOW STANDBY POWER PFC CONTROLLER

No Preview Available !

AL1788
Typical Applications Circuit
F1
VR1
L1
DB1
C1 C2
AUX
D1
R7 R10
C5
D2
T1
C3
R5 U1 AL1788
VCC
R12
R2
R6
C4
FB OUT
COMP CS
C7 GND
Q1
RCS
D3
C6
Figure 1. AL1788 Controller Flyback Application
F1
VR1
DB1
L1
C1 C2
R7
D1 R1
R5 U1 AL1788 R12
VCC OUT
FB CS
COMP GND
C3 R2
R6 C7
C4
Q1
RCS
L2
D2
C6
Figure 2. AL1788 Controller Buck Application
AL1788
Document number: DS39401 Rev. 1 - 2
2 of 13
www.diodes.com
October 2017
© Diodes Incorporated


Part Number AL1788
Description LOW STANDBY POWER PFC CONTROLLER
Maker Diodes
Total Page 13 Pages
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