AP1537 Datasheet, PDF (6/7 Pages) Anachip Corp – PWM Control 3A Step-Down Converter

PWM Control 3A Step-Down Converter
AP1537
„ Function Description
PWM Control
The AP1537 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system.
In converters of the AP1537, the pulse width varies
in a range from 0 to 100%, according to the load
current. The ripple voltage produced by the
switching can easily be removed through a filter
because the switching frequency remains constant.
Therefore, these converters provide a low-ripple
power over broad ranges of input voltage and load
current.
Under Voltage Lockout
The under voltage lockout circuit of the AP1537
assures that the high-side MOSFET driver outputs
remain in the off state whenever the supply voltage
drops below 3.3V. Normal operation resumes once
V_CC rises above 3.5V.
R_DS(ON) Current Limiting
The current limit threshold is setting by the internal
circuit.
„ Marking Information
( Top View )
8
5
AP1537
YY WW X
1
4
Logo
Part no.
ID code: internal
Xth week: 01~52
Year: "01" =2001
"02" =2002
Anachip Corp.
www.anachip.com.tw
Rev. 1.3 May 09, 2006
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