APE1612 Datasheet, PDF (1/9 Pages) Advanced Power Electronics Corp. – 1.9A FIXED FREQUENCY WHITE LED DRIVER

Advanced Power
Electronics Corp.
APE1612
1.9A FIXED FREQUENCY WHITE LED DRIVER
FEATURES
2.5V to 5.5 V Operating Input Voltage Rang
Drives up to 8 Series White LEDs
1.2MHz Fixed Switching Frequency
Wide Range for PWM Dimming (200Hz to 200KHz)
Internal 1.9A Switching Current Limit
Over Voltage Protection (OVP)
Internal Soft-start Function
Current Limit and Thermal Shutdown Protection
Under Voltage Lockout
Available in the TSOT-26 Packages
DESCRIPTION
The APE1612 is a step-up converter designed for
driving up to 8 series white LEDs for backlighting application.
The APE1612 uses current mode, 1.2MHz fixed frequency
architecture to regulate the LED current, which is set through
an external current sense resistor. Its low 300mV feedback
voltage reduces power loss and improves efficiency. The OV
pin monitors the output voltage and turns off the converter if
an over-voltage condition is present due to an open circuit
condition. The APE1612 includes under-voltage lockout,
current limiting and thermal shutdown protection preventing
damage in the event of an output overload. The driver is
available in TSOT-26 packages.
TYPICAL APPLICATION
1. 8 series LED application
VIN=5V
L1
4.7uH
C1
4.7uF
ON
OFF
U1
VCC _SW
EN
OV
GND FB
APE1612
D1
B240A
8-WLEDs
C2
1uF
I_LED= V_FB/R3, V_FB=300mV
2. LED Dimming application
VIN=5V
L1
4.7uH
D1
B240A
C1
4.7uF
Dimming
200~200KHz
U1
VCC _SW
EN
OV
GND FB
APE1612
R3
8-WLEDs
C2
1uF
R3
I_LED= V_FB/R3, V_FB=300mV
Data and specifications subject to change without notice
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