TOP412 Datasheet | Power Integrations

Features - Auto-restart and cycle by cycle current limiting functions handle both primary and secondary faults - On-chip latching thermal shutdown protects the entire system against overload Highly Versatile - Implements Buck, Boost, Flyback or Forward topology - Easily interfaces with both opto and primary feedback - Supports continuous or discontinuous mode of operation - Specified for operation down to 16 V DC input VIN D CONTROL ® ® TOP414 PI-2371-120198 Figure 1. Typical Application. Output Power Capability1-4 MINIMUM INPUT VOLTAGE 18 VDC 24 VDC 36 VDC 48 VDC 60 VDC 72 VDC 90 VDC ORDER PART NUMBER TOP412G 3W 5W 7W 9W 12 W 15 W 18 W TOP414G 4W 6W 9W 12 W 15 W 18 W 21 W Description The TOPSwitch family implements, with only three terminals, all functions necessary for a DC to DC, converter: high voltage N-channel power MOSFET with controlled turn-on gate driver, voltage mode PWM controller with integrated 120 k Hz oscillator, high voltage start-up bias circuit, bandgap derived reference, bias shunt regulator/error amplifier for loop pensation and fault protection circuitry. pared to discrete MOSFET and controller or self oscillating (RCC) switching converter solutions, a TOPSwitch integrated circuit can reduce total cost, ponent count, size, weight and at the same time increase efficiency and system reliability. This device is well suited for Tele, Cable and other DC to DC converter applications up to Table 1. TOP412/414 Output Power. Notes: 1. Assumes maximum junction temperature of 100 °C 2. Assumes output of 5 V and KRP of 0.4 3. Soldered to 1 sq. inch (645 mm2), 2 oz. copper clad (610 gm/mm2) 4. The continuous power capability in a given application depends on thermal environment, transformer design, efficiency required, input storage capacity, etc. 21W of output power. Internally, the lead frame of the SMD-8 package uses six of its pins to transfer heat from the chip directly to the board, eliminating the cost of a heat sink. April...