AX3161M5A

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 AX3161  BLOCK DIAGRAM EN 200mV V CC 220mV CURRENT SOURCE BIAS 1.235V REFERENCE 2.5V REGULATOR START UP + _ COMP. Current limit 52kHz OSC. _ FB COMP. + R2 + AMP _ + COMP. _ COMP. CONTROL + DRIVER 2A SWITCH R1 SW Thermal Shutdown Vss 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: TO263-5L ( Side View ) TO220-5L ( Side View ) 5 EN 4 FB 3 VSS 2 SW 1 VCC Metal Tab GND ( Top View ) ( Top View ) TO220-5LR ( Side 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 Metal Tab GND Name VCC Description Operating voltage input SW Switching output VSS GND pin FB Output voltage feedback control EN ON/OFF Shutdown 2/12 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Feb.26, 2015 AX3161  ORDER INFORMATION Order Information AX3161- XX XXX X Output Voltage Package Type Packing M5: TO263-5L Blank : Tube 50: 5.0V T5: TO220-5L A : Taping Blank:ADJ T5R: TO220-5LR Top Marking ADJ Logo FIX 1 61 AXY Y3 WW X Part number ID code:internal Logo AX 3 1- 56 01 Part number Output voltage Y YWW X ID code:internal WW:01~52 Year: 10=2010 11=2011 WW:01~52 Year: 10=2010 11=2011  ABSOLUTE MAXIMUM RATINGS Characteristics Symbol Rating Unit Maximum Supply Voltage VCC +63 V ON/OFF Pin Input Voltage VEN -0.3 to 35 V Feedback Pin Voltage VFB -0.3 to 35 V Output Voltage to Ground VOUT -0.8 V Power Dissipation Internally limited PD ( TJ-TA ) / θJA W Storage Temperature Range TST -65 to +150 °C Operating Junction Temperature Range TJ -40 to +125 °C Operating Supply Voltage VOP +4.5 to +60 V θJC 3.5 °C/W θJA 25 °C/W Thermal Resistance from Junction to case Thermal Resistance from Junction to ambient TO263 TO220 TO263 TO220 Note 1: θJA is measured with the PCB copper area (need connect to VSS pins) of approximately 3 in2 (Multi-layer). 3/12 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Feb.26, 2015 AX3161  ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA=25°C, VCC=12V. ILOAD = 0.2A) Characteristics Symbol Conditions FB=1.5V for Adjustable Quiescent Current IQ V version force driver off FB=1.3V Feedback bias current IFB V (Adjustable version only) pin=5V Shutdown supply Current ISD EN VCC=60V Oscillator frequency FOSC Oscillator frequency of short circuit protect FSCP Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current limit DC ICL - 4 8 mA - -10 -50 nA - 100 200 uA 40 52 65 KHz (Adjustable) When VFB