IRDC3841W

10/26/2009

13

Simultaneous Tracking at Power Up and Power Down

Vin=12V, Vo=1.8V, Io=8A, Room Temperature, No Air Flow

Fig. 18: Simultaneous Tracking a 3.3V input at power-up and shut-down

Ch2: Vout Ch3:SS Ch4: SEQ

In order to run the IR3841W in the simultaneous tracking mode, the following steps should be

taken:

- Remove R16 from the board.

- Set the value of R14 and R28 as R2 (4.02K) and R3 (2.55K), respectively.

- Connect the controlling input across SEQ and AGND test points on the board. This voltage

should be at least 1.15 time greater than Vo. For the following test results a 0-3.3V source is

applied to SEQ input.

- The controlling input should be applied after the SS pin is clamped to 3.0V.