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TS3404 bảng dữ liệu(PDF) 1 Page - Taiwan Semiconductor Company, Ltd |
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TS3404 bảng dữ liệu(HTML) 1 Page - Taiwan Semiconductor Company, Ltd |
1 / 10 page TS3404 Single Synchronous Buck PWM Controller Oscillator Frequency up to 300KHz 0.8V Internal Reference Drives N-Channel MOSFETs General Description The TS3405 makes simple work out of implementing a complete control and protection scheme for a DC-DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the TS3405 integrates the control, output a adjustment, monitoring and protection functions. The TS3405 provides simple, single feedback loop, voltage mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency. The error amplifier features a 15MHz gain-bandwidth product and 8V/uS slew rate, which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. The protection from over current conditions is provided by monitoring the Rds(on) of the lower MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. Applications Power supplies for microprocessors Subsystem power supplies Cable modems, set-top box, DSL modems DSP and core communications processor supplies Memory supplies Personal computer peripherals Industrial power supplies Low-voltage distributed power supplies Features Buck converter Vin operate from 3.3V ~ 14V Vcc operate from 3.75V ~ 6V Buck converter Vin can be greater than Vcc 0.8V to Vin output voltage ±1.5% over line voltage and temperature Simple single –loop control design Voltage-mode PWM control Loss less, programmable over current protection uses lower MOSFET’s Rds(on) Internal soft start Converter can source and sink current Fixed oscillator frequency 300KHz Ordering Information Part No. Operating Temp. Package TS3405CS -40 ~ +85 oC SOP-8 Absolute Maximum Rating Supply Voltage VCC 6 V Operating Supply Voltage VCC 4.5 ~ 5.5 V Absolute Boot Voltage VBOOT 20 V Upper Driver Supply Voltage VBOOT VPHASE 20 V Input, Output or I/O Voltage Gnd-0.3V to Vcc+0.3V V Operating Junction Temperature Range TJ -40 ~ +125 oC Ambient Temperature Range TJ -40 ~ +85 oC Storage Temperature Range TSTG -65 ~ +150 oC Lead Temperature 1.6mm(1/16”) from case for 10Sec. TLEAD 260 oC Pin assignment 1. Boot 8. Phase 2. Ugate 7. COMP 3. Gnd 6. FB 4. Lgate 5. Vcc TS3405 1-10 2003/12 rev. A |
Số phần tương tự - TS3404_1 |
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Mô tả tương tự - TS3404_1 |
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