AP1651BEL Datasheet, PDF (1/28 Pages) Asahi Kasei Microsystems – Dimmable LED driver IC for Lighting

[AP1651BEL]
AP1651BEL
Dimmable LED driver IC for Lighting
1. Genaral Description
The AP1651BEL (hereinafter referred to as the AP1651) is a current mode non-isolated low side buck
converter controller IC designed to support an LED general lighting application as a second stage (e.g. after
PFC stage). This IC provides "constant ripple control ", featuring the constant peak and bottom current of the
inductor which is sensed through low side sense resistors. This control scheme does not depend on either the
varying input voltage or the varying forward voltage of the LEDs, allowing the LED current to be obtained
with high stability.
The AP1651 supports two types of dimming; PWM dimming by pulse input and complex dimming by DC
input. Deep dimming down to 1% is achievable by using DC dimming. In addition, the DC dimming has an
even deeper dimming function by using an internal linear regulator for the LEDs. This "ultra-dimming"
which is supported from 500µA to 100µA is able to provide a new night light application.
This IC provides several protection function; over current protection, UVLO, and thermal shutdown for the
IC chip.
2. Features
 Low-side Switching Step-down Converter
 Current mode
- Continuous Conduction Mode (CCM)
- Linear Regulator Mode (Automatic Mode Selection)
 Operating Voltage Range
VDD = 11V to 26V
http://akm.transim.com/
 Operating Temperature
Ta = - 40 to 105 °C
 Dimming function
- External DC input (Complex Dimming 100% to 1% and Ultra-low current to 0%)
- Voltage Input of External Pulse (Dimming by PWM)
 Protection function:
- Over Current Protection for External N-channel Power MOSFET
- Under Voltage Lockout Function (UVLO)
- CS pin Open Protection
- Thermal Shutdown (TSD)
 Package
14-pin SOP
014003479-E-01
-1-
2014/10