MAX845 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX845 Datasheet PDF : 16 Pages
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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)
SWITCHING WAVEFORM
(BREAK-BEFORE-MAKE)
D1OFF
D2OFF
5V/div
400ns/div
D1
500mV/div
D2
TIME FROM SHUTDOWN TO POWER-UP
CIRCUIT
OF FIG. 1
D2ON
D1ON
200ns/div
2V/div
SD
OUTPUT
5µs/div
_____________________Pin Description
PIN NAME
FUNCTION
1
D1 Open Drain of N-Channel Transformer Drive 1
2
GND1
Ground. Connect both GND1 and GND2 to
ground.
Frequency Select (internal pull-up). If FS =
3
FS VCC or open, switch frequency = 725kHz; if
FS = 0V, switch frequency = 535kHz.
4
SD
Shutdown. Ground for normal operation,
connect to VCC for shutdown.
5
N.C. No Connect. Not internally connected.
6
VCC +5V Supply Voltage
7
GND2
Ground. Connect both GND1 and GND2 to
ground.
VIN
5V
C1
0.1µF
6
VCC
4 SD
ON / OFF
MAX845
R1
50Ω
1
D1
R2
50Ω
3
FREQUENCY
SELECT
FS
GND1
2
8
D2
GND2
7
8
D2 Open Drain of N-Channel Transformer Drive 2
Figure 1. Test Circuit
4 _______________________________________________________________________________________
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