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LM5574QMT/NOPB Datasheet(PDF) 3 Page - Texas Instruments |
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LM5574QMT/NOPB Datasheet(HTML) 3 Page - Texas Instruments |
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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 LM5574-Q1 www.ti.com SNOSB22C – OCTOBER 2008 – REVISED OCTOBER 2014 5 Pin Configuration and Functions 16-Pin TSSOP Package Top View Pin Functions PIN I/O DESCRIPTION APPLICATION INFORMATION NO. NAME 1 VCC 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. 2 SD 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 5 µA pull-up current source configures the regulator fully operational. 3 Vin I Input supply voltage Nominal operating range: 6 V to 75 V 4 SYNC I Oscillator synchronization input or output The internal oscillator can be synchronized to an external clock with an external pull-down device. Multiple LM5574-Q1 devices can be synchronized together by connection of their SYNC pins. 5 COMP O Output of the internal error amplifier The loop compensation network should be connected between this pin and the FB pin. 6 FB I Feedback signal from the regulated output This pin is connected to the inverting input of the internal error amplifier. The regulation threshold is 1.225 V. 7 RT I Internal oscillator frequency set input The internal oscillator is set with a single resistor, connected between this pin and the AGND pin. 8 RAMP 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. 9 AGND Ground Analog ground Internal reference for the regulator control functions 10 SS 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. 11 OUT O Output voltage connection Connect directly to the regulated output voltage. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM5574-Q1 |
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