AN2840 datasheet(13/19 Pages) STMICROELECTRONICS

部品番号	AN2840

部品情報	charger demonstration board based on the VIPER17HN

PDF	19 Pages

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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13 / 19 page

AN2840

Electrical performance

13/19

This circuit behavior is present due to a design that uses the output voltage to power the

TSM1052. Thanks to the very low VCC of this device, the output current can be regulated

even with a very small output voltage.

This application implements a simple circuit which compensates the voltage drop on the

output cable. The effect can be noted in Figure 16 and Table 4, which show the output

voltage measured at the output connector, after the output cable in different load conditions.

With the cable drop compensation (CDC) the output voltage is nearly constant, while without

CDC the output voltage drops down to 4.87 V (about -3.9%) at maximum load.

The measurements are taken at 115 VAC, but even at different input mains voltages

deviations are negligible (a few millivolts).

Figure 17.

Output voltage at output connector with and without CDC

Table 4.

Output voltage at output connector

IOUT [A]

0.2

0.4

0.6

0.8

VOUT [V] with CDC

5.07

5.06

5.08

VOUT [V] without CDC

5.12

5.03

4.99

4.95

4.91

4.87

AN2840 データシート(PDF) 13 Page - STMicroelectronics