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| 型号： | UCC38501DWTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SOIC-20 |
| 文件页数： | 19/34页 |
| 文件大小： | 758K |
| 代理商： | UCC38501DWTR |
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UCC28500, UCC28501, UCC28502, UCC28503
UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
26
www.ti.com
23 dB. Therefore the compensation circuitry needs to have a gain of 23 dB at the desired crossover frequency.
For this example R35 is calculated at approximately 18.2 k
. Capacitor C14 is estimated to be approximately
10 nF and C15 is calculated at approximately 180 pF.
H(s)
+ 20 log
V
REF
V
OUT
R35
+ R31
10 *GCO(s) dB)GOPTO(s) dB)H(s) dB
C14
+
1
2
p
R35
f
C
C15
+
1
2
p
R35
f
SW
2
Figure 16 shows the frequency response of the compensation network GC(s) and Figure 17 shows the
measured frequency response of the loop gain T(s). The frequency response characteristics in Figure 17 show
that fC is approximately 1.5 kHz with a phase margin of about 55 degrees. The gain margin is approximately
50 dB.
Figure 16
FEEDBACK CONTROL TRANSFER FUNCTION
(GAIN AND PHASE)
vs.
FREQUENCY
20
0
100
20
60
40
60
40
60
180
120
0
60
180
120
1 k
10 k
100 k
COMPENSATION
GAIN
COMPENSATION
PHASE
G
OPT
O
Gain
dB
Phase
Degrees
f Frequency Hz
20
0
20
60
40
60
40
100
1 k
10 k
100 k
60
180
120
0
60
180
120
Figure 17
G
OPT
O
Gain
dB
Phase
Degrees
TOTAL LOOP TRANSFER FUNCTION
(GAIN AND PHASE)
vs.
FREQUENCY
f Frequency Hz
LOOP GAIN
LOOP PHASE
(46)
(47)
(48)
(49)
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相关代理商/技术参数 |
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|---|---|
| UCC38501DWTRG4 | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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| UCC38501NG4 | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Combo Cntrlr RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| UCC38502 | 制造商:TI 制造商全称:Texas Instruments 功能描述:BICMOS PFC/PWM COMBINATION CONTROLLER |
| UCC38502DW | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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