Datasheet MAX845 (Maxim) - 4

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