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UC3825B датащи(PDF) 7 Page - Texas Instruments |
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UC3825B датащи(HTML) 7 Page - Texas Instruments |
7 / 9 page 7 UC1823A,B/1825A,B UC2823A,B/2825A,B UC3823A,B/3825A,B SYNCHRONIZATION The oscillator can be synchronized by an external pulse inserted in series with the timing capacitor. Program the free running frequency of the oscillator to be 10 to 15% slower than the desired synchronous frequency. The pulse width should be greater than 10ns and less than half the discharge time of the oscillator. The rising edge of the CLK/LEB pin can be used to generate a synchro- nizing pulse for other chips. Note that, the CLK/LEB pin will no longer accept an incoming synchronizing signal. General Oscillator Synchronization Operational Waveforms Two Units APPLICATIONS INFORMATION (cont.) HIGH CURRENT OUTPUTS Each totem pole output of the UC3823A,B and UC3825A,B can deliver a 2 amp peak current into a ca- pacitive load. The output can slew a 1000pF capacitor 15 volts in approximately 20 nanoseconds. Separate col- lector supply (VC) and power ground (PGND) pins help decouple the IC's analog circuitry from the high power gate drive noise. The use of 3 Amp Schottky diodes (1N5120, USD245 or equivalent) as shown in the figure from each output to both VC and PGND are recom- mended. The diodes clamp the output swing to the sup- ply rails, necessary with any type of inductive/capacitive load, typical of a MOSFET gate. Schottky diodes must be used because a low forward voltage drop is required. DO NOT USE standard silicon diodes. Although a "single ended" device, two output drivers are available on the UC3823A,B devices. These can be “par- alleled” by the use of a one-half ohm (noninductive) re- sistor connected in series with each output for a com- bined peak current of 4 Amps. Power MOSFET Drive Circuit UDG-95111 UDG-95113 UDG-95112 UDG-95114 |
Аналогичный номер детали - UC3825B |
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Аналогичное описание - UC3825B |
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