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UC1707-SP Scheda tecnica(PDF) 9 Page - Texas Instruments |
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UC1707-SP Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 20 page + 10 9 7 3 2 15 16 1 14 THERMAL SHUTDOWN LATCH 5 V REG 8 6 11 INPUT A N.I. INPUT A INVERT INPUT B INVERT INPUT B N.I. +VIN 130 mV S R H ± NO LATCH OR RESET L ± LATCH ENABLED LATCH DISABLE SHUTDOWN ANALOG STOP INV. ANALOG STOP NON-INV. GROUND 4,5,12,13 OUTPUT B OUTPUT A +Vc 9 UC1707-SP www.ti.com SLUSAG0A – MARCH 2011 – REVISED MARCH 2016 Product Folder Links: UC1707-SP Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview UC1707-SP was designed specifically as a power MOSFET driver for switching-mode power supply applications. It is capable of providing fast transitions and high-peak current required by power MOSFETs. One of the most important factors while developing the UC1707-SP was to isolate the high speed switching noise from the low level analog signals at the PWM. Separate supply and return paths at the driver signal inputs and power outputs further enhance noise immunity. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Shutdown Circuit Description The function of the circuitry is to be able to provide a shutdown of the device. This is defined as functionality that will drive both outputs to the low state. There are three different inputs that govern this shutdown capability. • Analog Stop Pins — The differential inputs to this comparator provide a way to execute a shutdown. • Latch Disable Pin — Assuming that the Shutdown pin is left open, a high on this pin disables the latching functionality of the Analog Stop shutdown. A low on this pin enables the latching functionality of the Analog Stop shutdown. If a shutdown occurs through the Analog Stop circuit while Latch Disable is high, then the outputs will go low, but will return to normal operation as soon as the Analog Stop circuit allows it. If a shutdown occurs through the Analog Stop circuit while Latch Disable is low, then the outputs will go low and remain low even if the Analog Stop circuit no longer drives the shutdown. The outputs will remain "latched" low (in shutdown) until the Latch Disable goes high and the Analog Stop circuit allows it to return from shutdown or the VIN voltage is cycled to 0 V and then returned above 5 V. |
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