AP1520S データシートの表示（PDF） - Diodes Incorporated.
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AP1520S Datasheet PDF : 8 Pages
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AP1520
PWM CONTROL 2A STEP-DOWN CONVERTER
Test Circuit
open
VCC OUTPUT FB
OCSET
open
A
EN
VSS
A
VCC OUTPUT FB
+
OCSET
-
EN
VSS
OUTPUT
VCC
FB
+
OCSET
-
EN
VSS
+
V
-
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.
ILOAD × RDS(ON) = IOCSET × ROCSET
See above formula for setting the current limit value.
AP1520 Rev. 1
6 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
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