Preliminary

Rev.01

14/16

EP1551

Auxiliary DC-DC Controllers

Figure 10. Block Diagram for Voltage-Mode Auxiliary DC-DC Controllers

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The three auxiliary voltage-mode DC-DC controllers are almost same. The only difference is just AUX1 has

optional internal divider. AUX2 and AUX3 must use external divider for feedback. Soft-start circuit is used

to ramp internal reference up from 0V to 1.25V. Output pulse width is modulated by the output of error

amplifier (ERR AMP).