AL1665
HIGH PERFORMANCE DIMMABLE LED CONTROLLER
Description
Pin Assignments
The AL1665 is a high-performance single-stage flyback and buckboost controller, targeting dimmable LED lighting application. It is a
primary side regulation (PSR) controller that can provide accurate
constant current (CC) regulation without optocoupler and secondary
control circuitry. It can be operated at BCM mode, which results in low
EMI and high efficiency, and keeps high power factor (PF) and low
total harmonic distortion (THD) under universal input voltage.
(Top View)
The AL1665 can support analog/PWM dimming modes. When a
50mV to 2.5V DC signal is applied on ADIM pin, the device is
operated in analog dimming mode. The analog dimming range is 5%
to 100%. When a PWM signal is applied to NTC/PWM pin, the device
is operated at PWM dimming mode. The PWM dimming range is
0.5% to 100% (1k PWM dimming frequency).
ADIM
1
8
FB
NTC/PWM
2
7
VCC
COMP
3
6
OUT
CS
4
5
GND
SO-8 (Standard)
The AL1665 has full protection features. It integrates multiple
protections including undervoltage lockout (UVLO), output
overvoltage (OVP), output short circuit (OSP), overcurrent protection
(OCP), winding short circuit, secondary diode short, internal thermal
foldback (TFP), and overtemperature protection (OTP).
The AL1665 is available in SO-8 (Standard) package.
Features
Applications
Primary Side Regulation without Optocoupler
Valley Switching for Low Switching Loss
Tight CS Reference Voltage 0.4V±1.5%
High PF>0.9 and Low THD
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