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UC1637 Arkusz danych(PDF) 5 Page - Texas Instruments |
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UC1637 Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 12 page UC1637 UC2637 UC3637 Figure 3. Modulation Schemes Showing (A) Zero Deadtime (B) Deadtime and (C) Deadband Configurations Shutdown Comparator The shutdown terminal may be used for implementing various shutdown and protection schemes. By pulling the terminal more than 2.5V 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 stabi- lized, the comparator can be used as an accurate low voltage lockout (Figure 4) and/or delayed start as in Fig- ure 5. In the shutdown mode the outputs are held in the low state. Current Limit A latched current limit amplifier with an internal 200mV offset is provided to allow pulse-by-pulse current limiting. Differential inputs will accept common mode signals from -VS to within 3V of the +VS supply while providing excel- lent noise rejection. Figure 6 shows a typical current sense circuit. Figure 4. External Under-Voltage Lockout Figure 5. Delayed Start-Up Figure 6. Current Limit Sensing 5 |
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