Isolated Transformer Driver

for PCMCIA Applications

4

_______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(

SWITCHING WAVEFORMS

(TWO CYCLES)

5V/div

400ns/div

D1

D2

SWITCHING WAVEFORM

(BREAK-BEFORE-MAKE)

500mV/div

200ns/div

D2OFF

D1OFF

CIRCUIT

OF FIG. 1

D2ON

D1ON

TIME FROM SHUTDOWN TO POWER-UP

2V/div

5

µs/div

SD

OUTPUT

_____________________Pin Description

No Connect. Not internally connected.

N.C.

5

+5V Supply Voltage

6

Ground. Connect both GND1 and GND2 to

ground.

GND2

7

Open Drain of N-Channel Transformer Drive 2

D2

8

Shutdown. Ground for normal operation,

SD

4

Frequency Select (internal pull-up). If FS =

FS = 0V, switch frequency = 535kHz.

FS

3

PIN

Ground. Connect both GND1 and GND2 to

ground.

GND1

2

Open Drain of N-Channel Transformer Drive 1

D1

1

FUNCTION

NAME

MAX845

D1

D2

FS

GND1

GND2

1

8

4

6

2

7

3

SD

FREQUENCY

SELECT

ON / OFF

R2

50

Ω

R1

50

Ω

5V

C1

0.1µF

Figure 1. Test Circuit