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AP1520 Datasheet(Scheda tecnica) 6 Page - Anachip Corp

Numero della parte AP1520
Dettagli  PWM Control 2A Step-Down Converter
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Produttore  ANACHIP [Anachip Corp]
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AP1520
PWM Control 2A Step-Down Converter
Anachip Corp.
www.anachip.com.tw
Rev. 1.5 Apr 10, 2006
6/7
Function Description
PWM Control
The AP1520 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system.
In converters of the AP1520, 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 AP1520
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
VCC rises above 3.5V.
RDS(ON) Current Limiting
The current limit threshold is setting by the external
resistor connecting from VCC supply to OCSET. The
internal 100uA sink current crossing the resistor
sets the voltage at the pin of OCSET. When the
PWM voltage is less than the voltage at OCSET, an
over-current condition is triggered.
R
I
R
I
OCSET
OCSET
DS(ON)
LOAD
×
=
×
See above formula for setting the current limit
value.
Marking Information
8
5
( Top View )
Logo
Part no.
ID code: internal
Year: "01" =2001
"02" =2002
Xth week: 01~52
14
AP1520
YY WW X
This Anachip version datasheet is replaced
with Diodes Inc. datasheet AP1520




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