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TOP242-250
TOPSwitch -GX Family
Extended Power, Design Flexible, ® EcoSmart, Integrated Off-line Switcher
Product Highlights
Lower System Cost, High Design Flexibility • Extended power range for higher power applications • No heatsink required up to 30 W using P package • Features eliminate or reduce cost 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/F packages • Line under-voltage (UV) detection: no turn off glitches • 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 transformer/power supply size • Half frequency option in Y/R/F packages for video applications • Hysteretic thermal shutdown for automatic fault recovery • Large thermal hysteresis prevents PC board overheating
AC IN
+ DC OUT -
®
D
L
CONTROL
TOPSwitch-GX
S X F
C
PI-2632-060200
Figure 1. Typical Flyback Application.
OUTPUT POWER TABLE
230 VAC ±15%4 85-265 VAC Adapter1 Open Frame2
PRODUCT3
Adapter1
Open Frame2
EcoSmart - Energy Efficient • Extremely low consumption in remote off mode (80 mW @ 110 VAC, 160 mW @ 230 VAC) • 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 single CMOS chip. Many new functions are integrated to reduce system cost and improve design flexibility, performance and energy efficiency.
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Depending on package type, either 1 or 3 additional pins over the TOPSwitch standard DRAIN, SOURCE and CONTROL terminals allow the following functions: line sensing (OV/UV, line feedforward/DCMAX reduction), accurate externally set current limit, remote ON/OFF, synchronization to an external lower frequency, and frequency selection (132 kHz/66 kHz). All package types provide the following transparent features: Softstart, 132 kHz switching 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 design and optimize system cost.
TOP242 P or G 9 W TOP242 R 21 W TOP242 Y or F 10 W TOP243 P or G 13 W TOP243 R 29 W TOP243 Y or F 20 W TOP244 P or G 16 W TOP244 R 34 W TOP244 Y or F 30 W TOP245 P 19 W TOP245 R 37 W TOP245 Y or F 40 W TOP246 R 40 W TOP246 Y or F 60 W TOP247 R 42 W TOP247 Y or F 85 W TOP248 R 43 W TOP248 Y or F 105 W TOP249 R 44 W TOP249 Y or F 120 W TOP250 R 45 W TOP250 Y or F 135 W
15 W 22 W 22 W 25 W 45 W 45 W 28 W 50 W 65 W 30 W 57 W 85 W 64 W 125 W 70 W 165 W 75 W 205 W 79 W 250 W 82 W 290 W
6.5 W 11 W 7W 9W 17 W 15 W 11 W 20 W 20 W 13 W 23 W 26 W 26 W 40 W 28 W 55 W 30 W 70 W 31 W 80 W 32 W 90 W
10 W 14 W 14 W 15 W 23 W 30 W 20 W 28 W 45 W 22 W 33 W 60 W 38 W 90 W 43 W 125 W 48 W 155 W 53 W 180 W 55 W 210 W
Table 1. Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at 50 °C ambient. 2. Maximum practical continuous power in an open frame design at 50 °C ambient. See Key Applications for detailed conditions. 3. See Part Ordering Information. 4. 230 VAC or 100/115 VAC with doubler.
September 2003
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TOP242-250
Section List
Functional Block Diagram ......................................................................................................................................... 3 Pin 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 Reduction ............................................................................................................................ 7 Error Amplifier ......................................................................................................................................................... 7 On-chip Current Limit with External Programmability ............................................................................................. 7 Line Under-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 Reference .............................................................................................................................................. 10 High-Voltage Bias Current Source ........................................................................................................................ 10
General Information & Table of Contents Product Selector Guide Data Sheets 1 2 3 4 5 6 7 8 9
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Using Feature Pins .................................................................................................................................................... 10 FREQUENCY (F) Pin Operation ........................................................................................................................... 10 LINE-SENSE (L) Pin Operation ............................................................................................................................ 10 EXTERNAL CURRENT LIMIT (X) Pin Operation ................................................................................................. 11 MULTI-FUNCTION (M) Pin Operation .................................................................................................................. 11
Application Notes Design Ideas
Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 14 Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins ....................................................... 15 Typical Uses of MULTI-FUNCTION (M) Pin ............................................................................................................. 17 Application Examples ............................................................................................................................................... 20 A High Efficiency, 30 W, Universal Input Power Supply ........................................................................................ 20 A High Efficiency, Enclosed, 70 W, Universal Adapter Supply .............................................................................. 21 A High Efficiency, 250 W, 250-380 VDC Input Power Supply ............................................................................... 22 Multiple Output, 60 W, 185-265 VAC Input Power Supply .................................................................................... 23 Processor Controlled Supply Turn On/Off ............................................................................................................ 24
Design Tools
Quality and Reliability
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Key Application Considerations .............................................................................................................................. 26 TOPSwitch-II vs. TOPSwitch-GX .......................................................................................................................... 26 TOPSwitch-FX vs. TOPSwitch-GX ....................................................................................................................... 27 TOPSwitch-GX Design Considerations ................................................................................................................ 28 TOPSwitch-GX Layout Considerations ................................................................................................................. 30 Quick Design Checklist ............................................................................................................
