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W-5200ZI-GT Datasheet(PDF) 6 Page - Copal Electronics

Part # W-5200ZI-GT
Description  Low Noise Regulated
Download  11 Pages
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Manufacturer  COPAL [Copal Electronics]
Direct Link  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-5200ZI-GT Datasheet(HTML) 6 Page - Copal Electronics

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W-5200 5
6
Block Diagram
5 5 V Fixed Output
+
EN
2MHz
Voltage
Doubler
300 k
100 k
1.25 V
GND
IN
5V
100 mA
OUT
SHDN
CNEG
CPOS
2VIN
Pin Functions
IN is the power supply. During normal operation the device
draws a supply current which is almost constant. A very
brief interval of non conduction will occur at the switching
frequency. The duration of the non conduction interval is
set by the internal non overlapping “break before make”
timing. IN should be bypassed with a 1 F to 4.7 Flow
ESR (Equivalent Series Resistance) ceramic capacitor
For filtering, a low ESR ceramic bypass capacitor (1 F)
in close proximity to the IN pin prevents noise from being
injected back into the power supply.
SHDN is the logic control input (Active LOW) that places
the device into shutdown mode. The internal logic is CMOS
and the pin does not use an internal pull down resistor. The
SHDN pin should not be allowed to float.
CPOS, CNEG are the positive and negative connections
respectively for the charge pump flying capacitor. A low
ESR ceramic capacitor (1 F) should be connected between
these pins. During initial power up it may be possible for the
capacitor to experience a voltage reversal and for this reason,
avoid using a polarized (tantalum or aluminum) flying
capacitor.
OUT is the regulated output voltage to power the load.
During normal operation, the device will deliver a train of
current pulses to the pin at a frequency of 2 MHz. Adequate
filtering on the pin can typically be achieved through the use
a low ESR ceramic bypass capacitor (1 F to 4.7 F) in close
proximity to the OUT pin. The ESR of the output capacitor
will directly influence the output ripple voltage.
When the shutdown mode is entered, the output is
immediately isolated from the input supply, however, the
output will remain connected to the internal feedback
resistor network (400 k ). The feedback network will result
in a reverse current of 10 A to 20 A to flow back through
the device to ground.
Whenever the device is taken out of shutdown mode, the
output voltage will experience a slew rate controlled
power up. Full operating voltage is typically achieved in
less than 0.5 msec.
GND is the ground reference for all voltages on
devices.


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