APE1601 Advanced Power Electronics Corp., APE1601 Datasheet - Page 6

• Manufacturer Part Number: APE1601
• Manufacturer: Advanced Power Electronics Corp.

Specifications of APE1601

• Support Voltage (min.): 2.5V
• Support Voltage (max.): 5.5V
• Frequency: 1MHz
• Quiescent Current Typ.: 3mA
• Output Current: 120mA
• Efficiency: 90%
• Package: QFN 3x3-16L

White LED Driver (120mA Charge Pump with Current Source)
Advanced Power
Electronics Corp.
Function Descriptions
low drop-out voltage current source to regulated 4 white LEDs current. For high efficiency,
the APE1601/A implements x1/x1.5/x2 mode charge pump. An external R
current of white LED. APE1601/A has an input current regulation to reduce the input ripple.
Soft Start
mode switching. Soft start circuit holds the input current level long enough for output
capacitor C
Mode Decision
maximum efficiency. Mode decision circuit senses the output and LED voltage for up/down
selection.
Dimming Control
signal is connected to the control pin, brightness of white LED is adjusted by the duty cycle.
LED Current Setting
through the white LED is 400 times greater than the current of R
can be estimated by following equation:
where V
Thermal Shutdown
shutdown circuit is needed to protect the chip from thermal damage. When the chip
reaches the shutdown temperature 150°C, the thermal shutdown circuit turns off the chip
to prevent the thermal accumulation in the chip.
Over Voltage Protection
output voltage reaches the designated level, the APE1601/A reduces the input current. And
then, the output voltage regulation also serves an over-voltage protection.
The APE1601/A is a high efficiency charge pump white LED driver. It provides 4 channels
The APE1601/A includes a soft start circuit to limit the inrush current at power on and
CTRL0 and CTRL1 are used to control the on/off of White LED. When an external PWM
The current of white LED connected to APE1601/A can be set by R
The APE1601/A provides a high current capability to drive 4 white LEDs. A thermal
The APE1601/A regulates the output voltage by controlling the input current. When the
The APE1601/A uses a smart mode decision method to select the working mode for
ISET
OUT
= 1.2V, and R
reaching a desired voltage level.
SET
is the resistance connected from I
I
LED
=
400
×
⎛
⎜
⎝
V
R
ISET
SET
⎞
⎟
⎠
SET
SET
. The white LED
to GND.
SET
. Every current flows
SET
APE1601/A
is used to set the
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