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AX3051 Datasheet

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

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AX3051/A
2.8A,Wide-Input Sensorless CC/CV Step-Down
DC/DC Converter
GENERAL DESCRIPTION
AX3051/A is a wide input voltage, high efficiency Active CC step-down DC/DC
converter that operates in either CV (Constant Output Voltage) mode or CC (Constant
Output Current) mode.
AX3051/A consists of step-down switching regulator with PWM control. The device
includes a reference voltage source, oscillation circuit, error amplifier and etc.
AX3051/A provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly forms 0 up to 90%.
An over current protection function is built outside that it can set by a resistance. An
external compensation is easily to system stable; the low ESR output capacitor can be
used.
With the addition of an internal N-channel Power MOS, a coil, capacitors, and a
diode connected externally, these ICs can function as step-down switching regulators.
They serve as ideal power supply units for portable devices when coupled with the
SOP-8L-EP packages, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 34V.
1/15
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.9 May. 06, 2015




AXElite

AX3051 Datasheet Preview

AX3051 Datasheet

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

No Preview Available !

AX3051/A
FEATURES
- Input Voltage8V to 34V
- Vout Accuracy (VFB=1V) ±1% /±2%
- CC/CV mode(Constant Current and Constant Voltage)
- Up to 2.8A output current
- ±5%/±15% Current limit Accuracy
- Duty ratio0% to 90% PWM control
- Oscillation frequency
AX3051: 100KHz
AX3051A: 250KHz
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal LX N-channel MOS.
- Current mode non-synchronous PWM converter
- External current limit setting.
- Over Voltage Protection 5.8V.
- Built in adjustable line-compensation.
- SOP-8L-EP Pb-Free packages
APPLICATIONS
- Car charger
- Portable charger Device.
BLOCK DIAGRAM
OSCILLATOR
RAMP
FB CLK
100KHz/250KHz
CURRENT
SENSE
AMPLIFIER
-
1V +
ERROR
AMPLIFIER
+
-
OVP
S
R
CURRENT
COMPARATOR
Q
Q
COMP
+
7V
-Zener
1.5V
SHUTDOWN
COMPARATOR
IN
INTERNAL
REGULATORS
5V
CURRENT
Limit
AMPLIFIER
IN
+
5V
-
M1
0.15Ω
BS
LX
M2
5Ω
GND
+ SENSE1
- SENSE2
2/15
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.9 May. 06, 2015


Part Number AX3051
Description Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
Maker AXElite
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AX3051 Datasheet PDF






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