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1、 TOP242-249 TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart , Integrated Off-line Switcher July 2001 Figure 1. Typical Flyback Application. PRODUCT3 Adapter1 Open Frame2 Open Frame2 OUTPUT POWER TABLE Table 1. Notes: 1. Typical continuous power in a non-ventilated enclosed adapter mea
2、sured at 50 C ambient. Assumes 1 sq. in. of 2 oz. copper heat sink area for R package. 2. Maximum practical continuous power in an open frame design at 50 C ambient. See Key Applications for detailed conditions. Assumes 3 sq. in. of 2 oz. copper heat sink area for R package. 3. See Part Ordering Inf
3、ormation. 4. 230 VAC or 100/115 VAC with doubler. PI-2632-060200 AC IN DC OUT D S C TOPSwitch-GX CONTROL L + - FX 230 VAC 15%4 Adapter1 85-265 VAC 9 W15 W6.5 W10 W 10 W22 W7 W14 W 10 W22 W7 W14 W 13 W25 W9 W15 W 20 W43 W15 W23 W 13 W45 W15 W30 W 16 W30 W11 W20 W 28 W52 W18 W28 W 30 W65 W20 W45 W 33
4、W58 W20 W32 W 40 W85 W26 W60 W 37 W65 W24 W36 W 60 W125 W40 W90 W 41 W73 W26 W43 W 85 W165 W55 W125 W 43 W78 W28 W48 W 105 W205 W70 W155 W 45 W82 W30 W52 W 120 W250 W80 W180 W Product Highlights Lower System Cost, High Design Flexibility Extended power range to 250 W Features eliminate or reduce cos
5、t of external components Fully integrated soft-start for minimum stress/overshoot Externally programmable accurate current limit Wider duty cycle for more power, smaller input capacitor Separate line sense and current limit pins on Y/R packages Line under-voltage (UV) detection: no turn off glitches
6、 Line overvoltage (OV) shutdown extends line surge limit Line feed forward with maximum duty cycle (DCMAX) reduction rejects line ripple and limits DCMAX at high line Frequency jittering reduces EMI and EMI filtering costs Regulates to zero load without dummy loading 132 kHz frequency reduces transf
7、ormer/power supply size Half frequency option in Y/R packages for video applications Hysteretic thermal shutdown for automatic fault recovery Large thermal hysteresis prevents PC board overheating EcoSmart - Energy Efficient Extremely low consumption in remote off mode (80 mW 110 VAC, 160 mW 230 VAC
8、) Frequency lowered with load for high standby efficiency Allows shutdown/wake-up via LAN/input port Description TOPSwitch-GX uses the same proven topology as TOPSwitch, cost effectively integrating the high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a singl
9、e CMOS chip. Many new functions are integrated to reduce system cost and improve design flexibility, performance and energy efficiency. Depending on package type, the TOPSwitch-GX family has either 1 or 3 additional pins over the standard DRAIN, SOURCE and CONTROL terminals. allowing the following f
10、unctions: line sensing (OV/UV, line feedforward/DC max reduction), accurate externally set current limit, remote on/off, and synchronization to an external lower frequency and frequency selection (132 kHz/66 kHz). All package types provide the following transparent features: Soft-start, 132 kHz swit
11、ching frequency (automatically reduced at light load), frequency jittering for lower EMI, wider DCMAX, hysteretic thermal shutdown and larger creepage packages. In addition, all critical parameters (i.e. current limit, frequency, PWM gain) have tighter temperature and absolute tolerance, to simplify
12、 design and optimize system cost. TOP242 P or G TOP242 R TOP242 Y TOP243 P or G TOP243 R TOP243 Y TOP244 P or G TOP244 R TOP244 Y TOP245 R TOP245 Y TOP246 R TOP246 Y TOP247 R TOP247 Y TOP248 R TOP248 Y TOP249 R TOP249 Y TOP242-249 2 E 7/01 August 8, 2000 Section List Functional Block Diagram. 3 Pin
13、Functional Description 4 TOPSwitch-GX Family Functional Description 5 CONTROL (C) Pin Operation .6 Oscillator and Switching Frequency .6 Pulse Width Modulator and Maximum Duty Cycle .7 Light Load Frequency Reduction7 Error Amplifier.7 On-chip Current Limit with External Programmability .7 Line Under
14、-Voltage Detection (UV) 8 Line Overvoltage Shutdown (OV) .8 Line Feed Forward with DCMAX Reduction 8 Remote ON/OFF and Synchronization.9 Soft-Start 9 Shutdown/Auto-Restart 9 Hysteretic Over-Temperature Protection 9 Bandgap Reference9 High-Voltage Bias Current Source10 Using Feature Pins 11 FREQUENCY
15、 (F) Pin Operation. 11 LINE-SENSE (L) Pin Operation 11 EXTERNAL CURRENT LIMIT (X) Pin Operation . 11 MULTI-FUNCTION (M) Pin Operation 12 Typical Uses of FREQUENCY (F) Pin 15 Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins.16 Typical Uses of MULTI-FUNCTION (M) Pin .19 Application E
16、xamples.21 A High Efficiency, 30 W, Universal Input Power Supply21 A High Efficiency, Enclosed, 70 W, Universal Adapter Supply 22 A High Efficiency, 250 W, 250 - 380 VDC Input Power Supply.23 Multiple Output, 60 W, 185 - 265 VAC Input Power Supply24 Processor Controlled Supply Turn On/Off 25 Key Application Considerations27 TOPSwitch-II vs. TOPSwitch-GX27 TOPSwitch-FX vs. TOPSwitch-GX .28 TOPSwitch-GX Design Considerations 29 TOPSwitch-GX Layout Considerations.31 Qui
