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UC2856Q Datasheet(PDF) 6 Page - Texas Instruments

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Part # UC2856Q
Description  IMPROVED CURRENT MODE PWM CONTROLLER
PDF  12 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UC2856Q Datasheet(HTML) 6 Page - Texas Instruments

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APPLICATION AND OPERATION INFORMATION
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
SGLS265 – NOVEMBER 2004
Figure 1. Oscillator Circuit
Figure 3. Error Amplifier Gain and Phase vs Frequency
NOTE: Error Amplifier can source up to 0.5 mA.
Figure 2. Error Amplifier Output Configuration
6



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