This product is not recommended for new designs. TOP232-234 TOPSwitch-FX Family Design Flexible, EcoSmart, Integrated Off-Line Switcher Product Highlights + AC DC Lower System Cost, High Design Flexibility IN OUT - Features eliminate or reduce cost of external components Fully integrated soft-start for minimum stress/overshoot Externally settable accurate current limit Wider duty cycle for more power, smaller input capacitor Line under-voltage (UV) detection: no turn off glitches D M Line overvoltage (OV) shutdown extends line surge limit CONTROL C Line feed-forward with maximum duty cycle (DC ) TOPSwitch-FX MAX reduction rejects ripple and limits DC at high line MAX S F Single resistor sets OV/UV thresholds, DC reduction MAX Frequency jittering reduces EMI and EMI filtering costs PI-2503-062515 Regulates to zero load without dummy loading Figure 1. Typical Flyback Application. 132 kHz frequency reduces transformer/power supply size Half frequency option for video applications Hysteretic thermal shutdown for automatic recovery Large thermal hysteresis prevents PC board overheating OUTPUT POWER TABLE Standard packages with omitted pins for large creepage Active-on and active-off remote ON/OFF capability 3 230 VAC 15% 85-265 VAC Product Synchronizable to a lower frequency Open Open 1 1 Adapter Adapter 2 2 Frame Frame EcoSmart Energy Efficient Cycle skipping reduces no-load consumption TOP232P 9 W 15 W 6.5 W 10 W Reduced consumption in remote off mode TOP232G Half frequency option for high efficiency standby TOP232Y 10 W 25 W 7 W 15 W Allows shutdown/wake-up via LAN/input port TOP233P Description 13 W 25 W 9 W 15 W TOP233G TOPSwitch-FX uses the proven TOPSwitch topology and TOP233Y 20 W 50 W 15 W 30 W cost effectively integrates many new functions that reduce TOP234P system cost and, at the same time, improve design flexibility, 16 W 30 W 11 W 20 W performance and energy efficiency. Like TOPSwitch, the TOP234G high-voltage power MOSFET, PWM control, fault protection TOP234Y 30 W 75 W 20 W 45 W and other control circuitry are all integrated onto a single CMOS chip, but with two added terminals. The first one is a Table 1. Notes: MULTI-FUNCTION (M) pin, which implements programmable 1. Typical continuous power in a non-ventilated enclosed adapter measured at line OV/UV shutdown and line feed-forward/DC reduction MAX 50 C ambient. with line voltage. The same pin can be used instead to 2. Maximum practical continuous power in an open frame design with adequate heat sinking, measured at 50 C ambient. See key applications section for externally set an accurate current limit. In either case, this pin detailed conditions. can also be used for remote ON/OFF or to synchronize the 3. Packages: P: DIP-8B, G: SMD-8B, Y: TO-220-7B. oscillator to an external, lower frequency signal. The second added terminal is the FREQUENCY (F) pin and is available only hysteretic thermal shutdown and larger creepage. In addition, in the Y package. This pin provides the half frequency option all critical parameters such as frequency, current limit, PWM when connected to CONTROL (C) instead of SOURCE (S). gain, etc. have tighter temperature and absolute tolerances The features on the new pins can be disabled by shorting compared to the TOPSwitch-II family. Higher current limit them to the SOURCE, which allows the device to operate in a accuracy and larger DC , when combined with other MAX three terminal TOPSwitch mode, but with the following new features allow for a 10% to 15% higher power capability on the transparent features: soft-start, cycle skipping, 132 kHz TOPSwitch-FX devices compared to equivalent TOPSwitch-II switching frequency, frequency jittering, wider DC , MAX devices for the same input/output conditions. www.power.com June 2015 This Product is Covered by Patents and/or Pending Patent Applications.TOP232-234 Section List Pin Functional Description ....................................................................................................................................... 3 TOPSwitch-FX Family Functional Description ........................................................................................................ 4 CONTROL (C) Pin Operation .................................................................................................................................... 4 Oscillator and Switching Frequency .......................................................................................................................... 5 Pulse Width Modulator and Maximum Duty Cycle .................................................................................................... 5 Minimum Duty Cycle and Cycle Skipping ................................................................................................................. 6 Error Amplifier .......................................................................................................................................................... 6 On-chip Current Limit with External Programability ................................................................................................... 6 Line Undervoltage Detection (UV) ............................................................................................................................. 6 Line Overvoltage Shutdown (OV) .............................................................................................................................. 7 Line Feed-Forward with DC Reduction ................................................................................................................ 7 MAX Remote ON/OFF and Synchronization ...................................................................................................................... 7 Soft-Start ................................................................................................................................................................. 8 Shutdown/Auto-Restart ........................................................................................................................................... 8 Hysteretic Over-Temperature Protection ................................................................................................................... 8 Bandgap Reference ................................................................................................................................................. 8 High-Voltage Bias Current Source ............................................................................................................................ 8 Using FREQUENCY and MULTI-FUNCTION Pins .................................................................................................... 9 FREQUENCY (F) Pin Operation ................................................................................................................................ 9 MULTI-FUNCTION (M) Pin Operation ........................................................................................................................ 9 Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 11 Typical Uses of MULTI-FUNCTION (M) Pin ............................................................................................................. 12 Application Examples ............................................................................................................................................. 14 A High Efficiency, 30 W, Universal Input Power Supply ........................................................................................... 14 35 W Multiple Output Power Supply ....................................................................................................................... 15 17 W PC Standby Power Supply ........................................................................................................................... 16 Processor Controlled Supply Turn On/Off ............................................................................................................... 17 Key Application Considerations .............................................................................................................................. 19 TOPSwitch-FX vs. TOPSwitch-ll ............................................................................................................................. 19 TOPSwitch-FX Design Considerations ................................................................................................................... 20 TOPSwitch-FX Selection .................................................................................................................................. 20 Input Capacitor ................................................................................................................................................ 20 Primary Clamp and Output Reflected V oltage V .......................................................................................... 20 OR Output Diode ................................................................................................................................................... 21 Soft-Start ......................................................................................................................................................... 21 EMI ................................................................................................................................................................. 21 Transformer Design.......................................................................................................................................... 21 Standby Consumption ..................................................................................................................................... 23 TOPSwitch-FX Layout Considerations .................................................................................................................... 23 Primary Side Connections ............................................................................................................................... 23 Y-Capacitor ..................................................................................................................................................... 23 Heat Sinking .................................................................................................................................................... 23 Quick Design Checklist .......................................................................................................................................... 23 Design Tools .......................................................................................................................................................... 23 Product Specifications and Test Conditions .......................................................................................................... 24 Typical Performance Characteristics ..................................................................................................................... 30 Package Outlines .................................................................................................................................................... 34 2 Rev. C 06/15 www.power.com