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| 型号： | V62/04752-01XE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | GREEN, PLASTIC, SOIC-28 |
| 文件页数： | 6/15页 |
| 文件大小： | 389K |
| 代理商： | V62/04752-01XE |
UC2875EP
PHASE SHIFT RESONANT CONTROLLER
SGLS233A FEBRUARY 2004 REVISED DECEMBER 2008
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION AND OPERATION INFORMATION
Slope/Ramp Pins
The ramp generator may be configured for the following control methods:
D Voltage Mode
D Voltage Feedforward
D Current Mode
D Current Mode with Slope Compensation
Figure 10 shows a voltage-mode configuration. With RSLOPE tied to a stable voltage source, the waveform on
CRAMP will be a constant-slope ramp, providing conventional voltage-mode control. If RSLOPE is connected to
the power supply input voltage, a variable-slope ramp will provide voltage feedforward.
Figure 10. Slope/Ramp Pins
1.
Simple voltage mode operation achieved by placing RSLOPE between VIN and SLOPE.
2.
Voltage Feedforward achieved by placing RSLOPE between supply voltage and SLOPE pin of UC2875.
RAMP
dV
dT
[
V
Rslope
R
SLOPE
C
RAMP
For current-mode control the ramp generator may be disabled by grounding the slope pin and using the ramp
pin as a direct current sense input to the PWM comparator.
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