UCD3138 datasheet(74/99 Pages) TI2

tên linh kiện	UCD3138

Giải thích chi tiết về linh kiện	UCD3138 Highly Integrated Digital Controller for Isolated Power

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12.1.4.3 GPIOS

GPIO is referenced to DGND internally. When GPIO pins are not used connect the pins to SGND. Alternatively,

they can be configured as output pins and set as low in the firmware. When GPIOs are used to drive other circuit

like LED, be aware that traces can pick up noise. A local resistor close to the signal receiver (like LED) is used to

terminate the coupled noise. If the big voltage swings, clamping diodes are needed for GPIO inputs, as shown in

Figure 12-3.

Figure 12-3. Clamping Diodes for GPIO

12.1.4.4 DPWM PINS

If DPWMs travel for a longer distance than 3 inches from the control card to a main power stage, a Schottky

clamping diode may be needed as shown in Figure 12-4to prevent electrical overstress on the device during

lightning test. The long trace may also pick up the noise from other switching sources. Avoid DPWM signals to

cross switching nodes.

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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UCD3138 bảng dữ liệu(PDF) 74 Page - Texas Instruments