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AX3161 Dataheets PDF



Part Number AX3161
Manufacturers AXElite
Logo AXElite
Description 2A PWM Buck DC/DC Converter
Datasheet AX3161 DatasheetAX3161 Datasheet (PDF)

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 pr.

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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 VÛm w`R •yÑb€ - 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. ww fo w.go tech .co m 1/11 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Oct.15, 2010 AX3161  BLOCK DIAGRAM EN 200mV V CC 220mV CURRENT SOURCE BIAS 1.235V REFERENCE 2.5V REGULATOR START UP COMP. + _ Current limit FB R2 + AMP _ COMP. R1 + COMP. COMP. CONTROL + DRIVER Thermal Shutdown ADJ : R2=0Ω, R1=OPEN  PIN ASSIGNMENT The packages of AX3161 are TO263-5L, TO220-5L and TO220-5LR the pin assignment is given by: VÛm w`R •yÑb€ TO263-5L ( Side View ) ww fo w.go tech .co m Metal Tab GND 5 EN 4 FB 3 VSS 2 SW 1 VCC ( Top View ) TO220-5LR ( Side View ) Name VCC SW 5 EN 4 FB 3 VSS 2 SW 1 VCC Metal Tab GND VSS FB EN ( Top View ) Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Oct.15, 2010 _ 52kHz OSC. + 2A SWITCH _ SW Vss Description Operating voltage input Switching output GND pin Output voltage feedback control ON/OFF Shutdown 2/11 AX3161  ORDER INFORMATION Order Information Top Marking ADJ FIX  ABSOLUTE MAXIMUM RATINGS Characteristics Maximum Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Internally limited Storage Temperature Range ww fo w.go tech .co m VÛm w`R •yÑb€ Symbol VCC VEN VFB VOUT PD TST TJ VOP TO263 TO220 TO263 TO220 θJC θJA Rating +63 -0.3 to 35 -0.3 to 35 .


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