AN2448 datasheet(8/21 Pages) STMICROELECTRONICS

Part #	AN2448

Description	This document describes a low power adapter that can be used in travel battery charger applications

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Electrical behavior

AN2448

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Figure 4.

Vin = 230 Vrms - 50 Hz

Due to the forward supply, the VDD voltage is directly proportional to the input voltage, so it

is nearly double at 230 Vac with respect to 115 Vac.

The worst case (maximum / minimum) supply voltages for both primary and secondary

sides are shown in Figure 5 and Figure 6.

For the maximum voltages, the converter operates with the maximum load in CV mode (that

is, the maximum output voltage is present, thanks to the cable drop compensation) and with

the maximum input voltage (264 Vac). In this condition the VIPer12A-E has a maximum

supply voltage of 35.2 V and the TSM1052 16.16 V. Minimum voltages are taken with short

circuit on the output (CC regulation) and minimum input voltage (90 Vac). Given this

condition the VIPer12A-E has a minimum supply voltage of 10.48 V and the TSM1052

2.12 V.

CH1: VIPer12A-E supply voltage (yellow)

CH2: VIPer12A-E feedback pin (light blue)

CH3: VIPer12A-E drain voltage (purple)

AN2448 Datasheet(PDF) 8 Page - STMicroelectronics