Maker : Power Integrations Inc.
Part No. : TOP414

Datasheet PDF : TOP414.pdf
Cross Reference : TOP414 Cross Reference
Buy Component : TOP414 Find Stock and Price

Shortcut : TOP412  TOP412  TOP412  TOP414  TOP414  TOP414 

Product Information

TOP412/414 TOPSwitch Family Three-terminal DC to DC PWM Switch Product Highlights Low Cost Replacement for Discrete Switchers • Up to 15 fewer components - cuts cost, increases reliability • Allows for a smaller and lighter solution under 12 mm height, all surface mount components Over 80% Efficiency in Flyback Topology • Built-in start-up and current limit reduce DC losses • Low capacitance MOSFET cuts switching losses • CMOS controller/gate driver consumes only 7 mW • 70% maximum duty cycle minimizes conduction losses Simplifies Design - Reduces Time to Market • Integrated PWM Controller and high power MOSFET • Only one external capacitor needed for compensation, bypass and start-up/auto-restart functions System Level Fault Protection 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 ® ® VO TOP414 S C 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 kHz oscillator, high voltage start-up bias circuit, bandgap derived reference, bias shunt regulator/error amplifier for loop compensation and fault protection circuitry. Compared to discrete MOSFET and controller or self oscillating (RCC) switching converter solutions, a TOPSwitch integrated circuit can reduce total cost, component count, size, weight and at the same time increase efficiency and system reliability. This device is well suited for Telecom, Cablecom 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 1999 TOP412/414 VC CONTROL ZC SHUNT REGULATOR/ ERROR AMPLIFIER + 5.7 V 5.7 V 4.7 V 0 DRAIN 1 INTERNAL SUPPLY SHUTDOWN/ AUTO-RESTART + - ÷8 POWER-UP RESET EXTERNALLY TRIGGERED SHUTDOWN IFB THERMAL SHUTDOWN + R S Q Q VI LIMIT OSCILLATOR DMAX CLOCK SAW CONTROLLED TURN-ON GATE DRIVER + PWM COMPARATOR S R Q Q LEADING EDGE BLANKING MINIMUM ON-TIME DELAY RE SOURCE PI-1746-011796 Figure 2. Functional Block Diagram. Pin Functional Description DRAIN Pin: Output MOSFET drain connection. Provides internal bias current during start-up operation via an internal switched highvoltage current source. Internal current sense point. CONTROL Pin: Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. Trigger input for latching shutdown. It is also used as the supply bypass and auto-restart/ compensation capacitor connection point. SOURCE Pin: Output MOSFET source connection. Primary-side circuit common, power return, and reference point. SOURCE 1 SOURCE 2 SOURCE 3 CONTROL 4 8 7 6 5 SOURCE (HV RTN) SOURCE (HV RTN) SOURCE (HV RTN) DRAIN G Package (SMD-8) PI-2208-120798 Figure 3. Pin Co...

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