MAX5014/MAX5015 19-2082 Rev 0 7/01 Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies General Description Features The MAX5014/MAX5015 integrate all the building Wide Input Range: (18V to 110V) or (13V to 36V) blocks necessary for implementing DC-DC fixed-fre- Current-Mode Control quency isolated power supplies. These devices are current-mode controllers with an integrated high-volt- Leading-Edge Blanking age startup circuit suitable for isolated telecom/industri- Internally Trimmed 275kHz 10% Oscillator al voltage range power supplies. Current-mode control Low External Component Count with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabi- Soft-Start lizes the current loop when operating at duty cycles High-Voltage Startup Circuit above 50% (MAX5014). The MAX5014 allows 85% operating duty cycle and could be used to implement Pulse-by-Pulse Current Limiting flyback converters, whereas the MAX5015 limits the Thermal Shutdown operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage SO-8 Package startup circuit allows these devices to draw power Ordering Information directly from the 18V to 110V input supply during start- up. The switching frequency is internally trimmed to PART TEMP. RANGE PIN-PACKAGE 275kHz 10%, thus reducing magnetics and filter com- MAX5014CSA* 0C to +70C8-SO ponent costs. MAX5014ESA* -40C to +85C8-SO The MAX5014/MAX5015 are available in 8-pin SO MAX5015CSA* 0C to +70C8-SO packages. An evaluation kit (MAX5015EVKIT) is also available. MAX5015ESA* -40C to +85C8-SO *See Selector Guide at end of data sheet. Warning: The MAX5014/MAX5015 are designed to operate with high voltages. Exercise caution. Typical Operating Circuit Applications Telecom Power Supplies V V IN OUT Industrial Power Supplies V+ Networking Power Supplies V DD Isolated Power Supplies NDRV CS Pin Configuration MAX5015 GND TOP VIEW V CC SS SHDN V+ 1 8 V CC OPTO OPTOCOUPLER V 2 7 NDRV DD MAX5014/ MAX5015 OPTO 3 6 GND SS SHDN 4 5 CS 8-SO Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLECurrent-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ABSOLUTE MAXIMUM RATINGS V+ to GND...-0.3V to +120V Continuous Power Dissipation (T = +70C) A V to GND...-0.3V to +40V 8-Pin SO (derate 5.88mW/C above +70C) .....471mW DD V to GND..-0.3V to +12.5V Operating Temperature Range.....-40C to +85C CC OPTO, NDRV, SS SHDN, CS to GND .-0.3V to V + 0.3V Storage Temperature Range...-65C to +150C CC V and V Current .....20mA Lead Temperature (soldering, 10s) +300C DD CC NDRV Current Continuous....25mA NDRV Current for Less than 1s....1A Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 13V, a 10F capacitor connects V to GND, V = 0, V+ = 48V, 0.1F capacitor connected to SS SHDN, NDRV = open cir- DD CC CS cuit, OPTO = GND, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY CURRENT I V = 0, V+ = 110V, driver not switching 0.85 1.3 V+(NS) DD V+ Supply Current mA V+ = 110V, V = 0, V = 4V, DD OPTO I 1.4 2.6 V+(S) driver switching V+ Supply Current After Startup V+ = 110V, V = 13V, V = 4V 11 A DD OPTO I V = 36V, driver not switching 0.9 1.3 VDD(NS) DD V S upp l y Cur r ent mA D D I V = 36V, driver switching, V = 4V 1.9 2.7 VDD(S) DD OPTO V+ Shutdown Current V = 0, V+ = 110V 190 290 A SS SHDN V Shutdown Current V = 0 8 20 A DD SS SHDN PREREGULATOR/STARTUP V+ Input Voltage 18 110 V V Supply Voltage 13 36 V DD INTERNAL REGULATORS (V ) CC Powered from V+, I = 7.5mA, V = 0 7.5 9.8 12 V CC DD V Output Voltage CC Powered from V , I = 7.5mA 9.0 10.0 11.0 V DD CC V Undervoltage Lockout V V falling 6.6 V CC CC UVLO CC OUTPUT DRIVER Peak Source Current V = 11V, (externally forced) 570 mA CC Peak Sink Current V = 11V, (externally forced) 1000 mA CC NRDV High-Side Driver V = 11V, externally forced, CC R 412 OH Resistance NDRV sourcing 50mA NDRV Low Side Driver V = 11V, externally forced, CC R 1.6 4 OL Resistance NDRV sinking 50mA PWM COMPARATOR OPTO Input Bias C ur r ent V V -1.00 1.00 A OPTO = SS SHDN OPTO Control Range 23V Slope Compensation V MAX5014 26 mV/s SCOMP 2 MAX5014/MAX5015