Diodes AP1501A User Manual
Ap1501a, Typical application circuit, Features
AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
AP1501A Rev. 10
1 of 14
SEPTEMBER 2009
DS31191
©
Diodes Incorporated
•
Output voltage: 3.3V, 5V, 12V and adjustable output
version
•
Adjustable version output voltage range, 1.23V to
37V+4%
• 150Khz
+15% fixed switching frequency
•
Voltage mode non-synchronous PWM control
• Thermal-shutdown
and
current-limit
protection
•
ON/OFF shutdown control input
•
Operating voltage can be up to 40V
•
Output load current: 5A
•
Low power standby mode
•
Built-in switching transistor on chip
•
Lead Free packages: TO263-5L and TO220-5L(R)
•
TO263-5L and TO220-5L(R): Available in “Green”
Molding Compound (No Br, Sb)
•
Lead Free Finish/ RoHS Compliant (Note 1)
The AP1501A series are monolithic ICs that are designed for a
step-down DC/DC converter, and possess the ability to drive a
5A load without additional transistor component. Due to reducing
the number of external component, the board space can be
saved easily. The external shutdown function can be controlled
by logic level and then come into standby mode. The internal
compensation makes feedback control have good line and load
regulation without external design. Regarding protected function,
thermal shutdown is to prevent over temperature operating from
damage, and current limit is against over current operating of the
output switch. The AP1501A series operates at a switching
frequency of 150Khz thus allowing smaller sized filter
components than what would be needed with lower frequency
switching regulators. Other features include a guaranteed
+4% tolerance on output voltage under specified input voltage
and output load conditions, and +15% on the oscillator frequency.
The output version includes fixed 3.3V, 5V, 12V, and an
adjustable type. The packages are available in a standard 5-lead
TO263 and TO220 packages.
•
Simple High-efficiency step-down regulator
•
On-card switching regulators
•
Positive to negative converter
Typical Application Circuit
(1) Fixed Type Circuit
1
2
3
5
4
12V
DC Input
Cin
Capacitor
FB
SD
D1
Schottky
Diode
Vin
Gnd
Output
AP1501A
-33
Co
Capacitor
Inductor
L1
18uH
3.3V/5A
Output Load
Features
General Description
Applications