MAX845 datasheet(4/16 Pages) MAXIM

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Isolated Transformer Driver

for PCMCIA Applications

_______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(

Typical Operating Circuit, VIN = 5V, C1 = 0.1µF, C2 = C3 = 0.33µF, T1 = Halo TGM-010P3, CR1 = CR2 = MBR0520, FS = VCC,

TA = +25°C, unless otherwise noted.)

SWITCHING WAVEFORMS

(TWO CYCLES)

5V/div

400ns/div

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

µs/div

OUTPUT

_____________________Pin Description

No Connect. Not internally connected.

N.C.

+5V Supply Voltage

VCC

Ground. Connect both GND1 and GND2 to

ground.

GND2

Open Drain of N-Channel Transformer Drive 2

Shutdown. Ground for normal operation,

connect to VCC for shutdown.

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

VCC or open, switch frequency = 725kHz; if

FS = 0V, switch frequency = 535kHz.

Ground. Connect both GND1 and GND2 to

ground.

GND1

Open Drain of N-Channel Transformer Drive 1

FUNCTION

NAME

MAX845

GND1

GND2

VCC

FREQUENCY

SELECT

ON / OFF

Ω

VIN

0.1µF

Figure 1. Test Circuit

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