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EVAL6902D
L6902D 1A Constant current battery charger evaluation board
Data Brief
General description
The L6902D evaluation board integrates the stepdown switching regulator with adjustable current limit L6902D as well as the external components required for a typical application. The input voltage of the application board can range from 8V up to 25V due to the rated voltage of the input capacitor and the schottky rectifier repetitive peak reverse voltage (both 25V). The external resistor divider (R1 and R2) sets the output voltage of the application board to 3.3V. A different output voltage can be regulated from 1.235V up to 10V, which is the rated voltage of the output capacitor. A current limit of 1A is programmed by the 100m sense resistor Rsense. The inductor saturation current and the forward current of the schottky rectifier fit the current limit setting. Evaluation board
October 2006
Rev 1
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For further information contact your local STMicroelectronics sales office.
EVAL6902D Figure 1.
VIN
Application test circuit
OUT D1 L1 VOUT
VCC VREF COMP C1 C3 R3 GND C4
Rsense
L6902D
CS+ CSFB
R1 C2 R2
Figure 2.
Package
Table 1.
Name C1 C2 D1 L1 Device R1 R2 R3 C3 C4 Rsense
Demoboard part list
Value 10F 100F P/N C4532X5R1E106M 10TPB100M STPS2L25U 22H DO1813HC-223 L6902D 8.2 k 3.3 k 4.7 k 220pF 22nF 100m Manufacturer TDK POSCAP ST COILCRAFT ST 0603, 1% 0603, 1% 0603, 1% 0603, 50V 0603, 50V Notes
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EVAL6902D
Revision history
1
Revision history
Table 2.
Date 17-Oct-2006
Revision history
Revision 1 First issue Changes
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EVAL6902D
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