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UC1637-SP Scheda tecnica(PDF) 6 Page - Texas Instruments |
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UC1637-SP Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 11 page (-BIN, +AIN) (+BIN, -AIN) (-BIN) (+AIN) (-BIN) (+AIN) (-BIN) (+AIN) (-BIN) (+AIN) UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com Figure 3. Modulation Schemes Showing (A) Zero Deadtime, (B) Deadtime and (C) Deadband Configurations Ouput Drivers Each output driver is capable of both sourcing and sinking 100 mA steady state and up to 500 mA on a pulsed basis for rapid switching of either POWERFET or bipolar transistors. Output levels are typically -VS+0.2 V at 50 mA low level and +VS-2 V at 50 mA high level. Error Amplifier The error amplifier consists of a high slew rate (15 V/ms) op-amp with a typical 1-MHz bandwidth and low output impedance. Depending on the ±VS supply voltage, the common mode range and the voltage output swing is within 2 V of the VS supply. Under-Voltage Lockout An under-voltage lockout circuit holds the outputs in the low state until a minimum of 4 V is reached. At this point, all internal circuitry is functional and the output drivers are enabled. If external circuitry requires a higher starting voltage, an over-riding voltage can be programmed through the shutdown terminal as shown in Figure 4. Shutdown Comparator The shutdown terminal may be used for implementing various shutdown and protection schemes. By pulling the terminal more than 2.5 V below VIN, the output drivers will be enabled. This can be realized using an open collector gate or NPN transistor biased to either ground or the negative supply. Since the threshold is temperature stabilized, the comparator can be used as an accurate low voltage lockout (Figure 4) and/or delayed start as in Figure 5. In the shutdown mode the outputs are held in the low state. 6 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP |
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