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UC2825A-Q1 Fiches technique(PDF) 10 Page - Texas Instruments |
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UC2825A-Q1 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 14 page www.ti.com High-Current Outputs VC VC 1 nF 10 µF D1 6.8 W GND D1, D2 = 1N5820 PGND D2 OUT Ground Planes UC2825A-Q1 SLUS781 – SEPTEMBER 2007 Each totem pole output can deliver a 2-A peak current into a capacitive load. The output can slew a 1000-pF capacitor by 15 V in approximately 20 ns. Separate collector supply (VC) and power ground (PGND) pins help decouple the device's analog circuitry from the high-power gate drive noise. The use of 3-A Schottky diodes (1N5120, USD245, or equivalent) (see Figure 13) from each output to both VC and PGND are recommended. The diodes clamp the output swing to the supply 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 they are single-ended devices, two output drivers are available on the UC2825A. These can be paralleled by the use of a 0.5- Ω (noninductive) resistor connected in series with each output for a combined peak current of 4 A. Figure 12. Power MOSFET Drive Circuit Each output driver of these devices is capable of 2-A peak currents. Careful layout is essential for correct operation of the chip. A ground plane must be employed. A unique section of the ground plane must be designated for high di/dt currents associated with the output stages. This point is the power ground to which the PGND pin is connected. Power ground can be separated from the rest of the ground plane and connected at a single point, although this is not necessary if the high di/dt paths are well understood and accounted for. VCC should be bypassed directly to power ground with a good high-frequency capacitor. The sources of the power MOSFET should connect to power ground, as should the return connection for input power to the system and the bulk input capacitor. The output should be clamped with a high-current Schottky diode to both VCC and PGND. Nothing else should be connected to power ground. VREF should be bypassed directly to the signal portion of the ground plane with a good high-frequency capacitor. Low ESR/ESL ceramic 1-mF capacitors are recommended for both VCC and VREF. All analog circuitry should, likewise, be bypassed to the signal ground plane. 10 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated |
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