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AX3161 Datasheet Preview

AX3161 Datasheet

2A PWM Buck DC/DC Converter

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AX3161
52KHz, 2A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3161 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 2A load without additional transistor. It saves board space. The
external shutdown function can be controlled by logic level and then come into standby
mode. The internal compensation makes feedback control having 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. If current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced. An external compensation is easily to system
stable; the low ESR output capacitor can be used.
The AX3161 series operates at a switching frequency of 52KHz thus allow smaller
sized filter components than what would be needed with lower frequency switching
regulators. The output version included fixed 5V, 12V, and an adjustable type. The chips
are available in standard TO263-5L, TO220-5L and TO220-5LR packages.
FEATURES
- Output voltage: 5V and adjustable output version.
- Adjustable version output voltage range, 1.23V to 57V.
- 52KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 60V.
- Output load current: 2A.
- TO263-5L, TO220-5L and TO220-5LR Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Feb.26, 2015




AXElite

AX3161 Datasheet Preview

AX3161 Datasheet

2A PWM Buck DC/DC Converter

No Preview Available !

AX3161
BLOCK DIAGRAM
EN
CURRENT
SOURCE
BIAS
1.235V
REFERENCE
2.5V
REGULATOR
START
UP
220mV
FB
R2
R1
+
_AMP
COMP.
ADJ : R2=0Ω , R1=OPEN
52kHz
OSC.
+
COMP_.
Current
limit
COMP.
+
+
COMP.
CONTROL
+
DRIVER
Thermal
Shutdown
200mV
V CC
2A
SWITCH
SW
Vss
PIN ASSIGNMENT
The packages of AX3161 are TO263-5L, TO220-5L and TO220-5LR the pin assignment is
given by:
TO263-5L ( Side View )
TO220-5L ( Side View )
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
TO220-5LR ( Side View )
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
Name
VCC
SW
VSS
FB
EN
Description
Operating voltage input
Switching output
GND pin
Output voltage feedback control
ON/OFF Shutdown
2/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Feb.26, 2015


Part Number AX3161
Description 2A PWM Buck DC/DC Converter
Maker AXElite
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