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UC2856Q Fiches technique(PDF) 6 Page - Texas Instruments

No de pièce UC2856Q
Description  IMPROVED CURRENT MODE PWM CONTROLLER
Download  15 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2856Q Fiches technique(HTML) 6 Page - Texas Instruments

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VREF
9
COMP
S0019-01
CT
8
RT
8 mA
10
SYNC
SAWTOOTH CT
OSC SYNC
Output Deadtime (td)
NOTE: Output deadtime is determined by the size of the external capacitor, CT, according to the formula:
For large values of RT:
Oscillator frequency is approximated by the formula:
Td +
2C
T
8 mA *
3.6
R
T
ƒ
T +
2
R
T
C
T
Td + 250 CT
VREF
6
S0020-01
0.5 mA
5
+
Zs
Zf
lf < 0.5 mA
VREF
7
COMP
−20
−10
0
10
20
30
40
50
60
70
80
90
0
−180
−90
G001
f − Frequency − Hz
VIN = 20 V
TJ = 25°
10M
1k
10k
100
100k
1M
UC2856Q
SGLS265A
– NOVEMBER 2004 – REVISED MAY 2011
www.ti.com
APPLICATION AND OPERATION INFORMATION
Figure 1. Oscillator Circuit
NOTE: Error Amplifier can source up to 0.5 mA.
Figure 2. Error Amplifier Output Configuration
Figure 3. Error Amplifier Gain and Phase vs
Frequency
6
Copyright
© 2004–2011, Texas Instruments Incorporated


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