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The MAX5003 high-voltage switching power-supply controller has all the features and building blocks need-ed for a cost-effective flyback and forward voltage-mode control converter. This device can be used to design both isolated and nonisolated power supplies with multiple output voltages that operate from a wide range of voltage sources. It includes a high-voltage internal start-up circuit that operates from a wide 11V to 110V input range. The MAX5003 drives an external N-channel power MOSFET and has a current-sense pin that detects overcurrent conditions and turns off the power switch when the current-limit threshold is exceeded. The choice of external power MOSFET and other external components determines output voltage and power. The MAX5003 offers some distinctive advantages: soft-start, undervoltage lockout, external frequency synchro-nization, and fast input voltage feed-forward. The device is designed to operate at up to 300kHz switch-ing frequency. This allows use of miniature magnetic components and low-profile capacitors. Undervoltage lockout, soft-start, switching frequency, maximum duty cycle, and overcurrent protection limit are all adjustable using a minimum number of external components. In systems with multiple controllers, the MAX5003 can be externally synchronized to operate from a common sys-tem clock.
MAX5003 Maximum Ratings
ABSOLUTE MAXIMUM RATINGS V+ to GND............................................................-0.3V to +120V ES to GND ..............................................................-0.3V to +40V VDD to GND............................................................-0.3V to +19V VCC to GND.........................................................-0.3V to +12.5V MAXTON, COMP, CS, FB, CON to GND..................-0.3V to +8V NDRV, SS, FREQ to GND...........................-0.3V to (VCC + 0.3V) INDIV, REF to GND.................................................-0.3V to +4.5V VCC, VDD, V+, ES Current ................................................±20mA NDRV Current, Continuous...............................................±25mA NDRV Current, 1µs .............................................................±1A CON and REF Current ......................................................±20mA All Other Pins ....................................................................±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin SO (derate 9.5mW/°C above +70°C)...............762mW 16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW Maximum Junction Temperature (TJ) ..............................+150°C Operating Temperature Ranges MAX5003C_E ....................................................0°C to +70°C MAX5003E_E ..................................................-40°C to +85°C Operating Junction Temperature (TJ) .............................+125°C 16-Pin SO JA.................................................................105°C/W 16-Pin QSOP JA............................................................120°C/W Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
MAX5003 Features
Wide Input Range: 11V to 110V Internal High-Voltage Startup Circuit Externally Adjustable Settings Output Switch Current Limit Oscillator Frequency Soft-Start Undervoltage Lockout Maximum Duty Cycle Low External Component Count External Frequency Synchronization Primary or Secondary Regulation Input Feed-Forward for Fast Line-Transient Response Precision ±2.5% Reference over Rated Temperature Range
MAX5003 Typical Application
Telecommunication Power Supplies ISDN Power Supplies +42V Automobile Systems High-Voltage Power-Supply Modules Industrial Power Supplies