Rainbow-electronics MAX1641 Manual do Utilizador Página 1

General Description________________The MAX1640/MAX1641 CMOS, adjustable-output,switch-mode current sources operate from a +5.5V to+26V input, and are

MAX1640/MAX1641MAX1641’s high switching frequency demands a high-speed rectifier (Table 2). Schottky diodes such as the1N5817–1N5822 are recommended.

configuration to PGND. These traces should be wide toreduce resistance and as short as possible to reducestray inductance. All low-current ground path

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier2 _____________________________________________________________

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier_______________________________________________________________

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier4 _____________________________________________________________

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier_______________________________________________________________

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier6 _____________________________________________________________

MAX1640/MAX1641Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier_______________________________________________________________

MAX1640/MAX1641The voltage at SET is given by:R1 = R2 (VREF/ VSET-1 ); 10kΩ < R2 < 300kΩwhere VREF= 2V and VSETis proportional to thedesired out

where VTERM= 2V and VOUTis the desired outputvoltage.Programming the Off-TimeWhen programming the off-time, consider such factorsas maximum inductor c