UCD3138RMHT datasheet(69/99 Pages) TI2

Part #	UCD3138RMHT

Description	UCD3138 Highly Integrated Digital Controller for Isolated Power

PDF	99 Pages

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Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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Figure 11-1. V33 Voltage Dip When POR is Activated

From the Figure 11-1 recommendations, the slew rate using the 2.2 uF/1uF capacitor combination requires that

the slew rate must be as follows:

(1)

11.4 Recommendation for RC Time Constant of RESET Pin for UCD3138 and UCD3138064

Ideally, the ARM core should begin execution of ROM code only after V33>3V. The ROM code reads trim

values and loads trim registers. Lack of sufficient voltage during this operation can result in unexpected device

functioning. Depending on V33 slew rate, the duration for which there is insufficient voltage on V33 is varied.

During this time, a reliable trim operation is not ensured. Applying an RC filter between V33 and the RESET pin

can increase the delay from V33 power up to the device coming out of reset.

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UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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UCD3138RMHT Datasheet(PDF) 69 Page - Texas Instruments