AP4312K6TR-G1 Diodes Incorporated

A Product Line of Diodes Incorporated AP4312 CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER Description Pin Assignments The AP4312 is a highly integrated solution for a constant (Top View) voltage/constant current mode SMPS application. Pin 1 Mark The AP4312 contains one 1.21V voltage reference, one low voltage reference used in current sensing circuit and two operational amplifiers. The 1.21V voltage reference, combined with one V V CTRL 1 6 CC operational amplifier, makes of an ideal voltage controller for use in adapters and battery chargers. The low voltage reference, combined GND 5 V 2 SENSE with another operational amplifier, makes of an ideal current limiter for output low side current sensing. V 3 4 I OUT CTRL The AP4312 is fully compatible with AP4306 in functionality and electrical characteristics except its lower reference voltage for current control loop, thus higher power efficiency in SMPS applications such SOT26 (K6 Package) as low power charger can be realized with AP4312 compared to AP4306. Applications The AP4312 is available in SOT26 package. Adapters Battery Chargers Features Constant Voltage and Constant Current Control Precision Internal Voltage Reference Low External Component Count Easy Compensation Low Supply Current: 180 A Current Control Loop Reference: 70mV Operating Supply Voltage: 1.7V to 18V Totally Lead-free & Fully RoHS Compliant (Note 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated AP4312 Typical Applications Circuit V + OUT To primary R2 I AP4312 L V CC R4 C1 1.210V R3 V OUT + + V Load CTRL C3 GND R5 I V CTRL SENSE R1 R6 500 V - OUT R SS R1 R2 V SENSE V V CurrentLimit OUT REF R1 R SS Typical Application 1 V + OUT To primary R2 I L AP4312 V CC R4 C1 1.210V R3 V OUT + + V Load CTRL C3 GND R5 I V CTRL SENSE R1 R6 500 V - OUT R SS R1 R2 V SENSE V V (I R ) (I R ) CurrentLimit O REF L SS L SS UT R R1 SS Typical Application 2 2 of 11 January 2014 AP4312 Diodes Incorporated www.diodes.com Document number: DS36797 Rev. 1 - 2