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LM5575-Q1 bảng dữ liệu(PDF) 3 Page - Texas Instruments |
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LM5575-Q1 bảng dữ liệu(HTML) 3 Page - Texas Instruments |
3 / 33 page 1 2 3 4 5 6 7 8 VIN PRE FB VCC IS AGND OUT RAMP 9 10 11 12 COMP SD BST RT 13 14 15 16 SS PGND SYNC SW LM5575-Q1 www.ti.com SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014 6 Pin Configuration and Functions PWP Package 16-Pin HTSSOP With Exposed Thermal Pad Top View Pin Functions PIN I/O DESCRIPTION APPLICATION INFORMATION NAME NO. VCC 1 O Output of the bias regulator Vcc tracks Vin up to 9 V. Beyond 9 V, Vcc is regulated to 7 volts. A 0.1- uF to 1-uF ceramic decoupling capacitor is required. An external voltage (7.5 V – 14 V) can be applied to this pin to reduce internal power dissipation. SD 2 I Shutdown or UVLO input If the SD pin voltage is below 0.7 V the regulator will be in a low power state. If the SD pin voltage is between 0.7 V and 1.225 V the regulator will be in standby mode. If the SD pin voltage is above 1.225 V the regulator will be operational. An external voltage divider can be used to set a line undervoltage shutdown threshold. If the SD pin is left open circuit, a 5µA pull-up current source configures the regulator fully operational. Vin 3 I Input supply voltage Nominal operating range: 6 V to 75 V SYNC 4 I Oscillator synchronization input or The internal oscillator can be synchronized to an external clock with an output external pull-down device. Multiple LM5575-Q1 devices can be synchronized together by connection of their SYNC pins. COMP 5 O Output of the internal error amplifier The loop compensation network should be connected between this pin and the FB pin. FB 6 I Feedback signal from the regulated This pin is connected to the inverting input of the internal error amplifier. output The regulation threshold is 1.225 V. RT 7 I Internal oscillator frequency set The internal oscillator is set with a single resistor, connected between input this pin and the AGND pin. RAMP 8 O Ramp control signal An external capacitor connected between this pin and the AGND pin sets the ramp slope used for current mode control. Recommended capacitor range 50 pF to 2000 pF. AGND 9 Ground Analog ground Internal reference for the regulator control functions SS 10 O Soft-start An external capacitor and an internal 10-µA current source set the time constant for the rise of the error amp reference. The SS pin is held low during standby, Vcc UVLO and thermal shutdown. OUT 11 O Output voltage connection Connect directly to the regulated output voltage. PGND 12 Ground Power ground Low side reference for the PRE switch and the IS sense resistor. IS 13 I Current sense Current measurement connection for the re-circulating diode. An internal sense resistor and a sample/hold circuit sense the diode current near the conclusion of the off-time. This current measurement provides the DC level of the emulated current ramp. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM5575-Q1 |
Số phần tương tự - LM5575-Q1_17 |
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Mô tả tương tự - LM5575-Q1_17 |
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