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UCC25705-Q1 Datasheet(PDF) 9 Page - Texas Instruments

Part # UCC25705-Q1
Description  HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC25705-Q1 Datasheet(HTML) 9 Page - Texas Instruments

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background image
4
5
RC
DISCH
3
VFF
R
T
C
T
V
IN
FF
ON
T
T
IN
V
T
R
C where
V
= a ´
´
a =
T
T
1
f
R
C
75ns
=
´
+
UCC25705-Q1, UCC25706-Q1
www.ti.com
SLUSAI1
– MAY 2011
Oscillator Without Duty Cyle Clamp (MODE = 0)
In this mode, the timing capacitor is discharged through a low impedance directly to ground. The DISCH pin is
externally grounded. A comparator connected to DISCH senses the ground connection and disables both the
discharge current source and VFF current source. A resistor divider is now required to set VFF.
Figure 4. Ocsillator Without Clamp (MODE = 0)
In this mode, the on-time is approximately:
The off-time is: TOFF ≈ 75 ns
The frequency is:
Copyright
© 2011, Texas Instruments Incorporated
9


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