參數(shù)資料
型號(hào)： X9318
元件分類： 數(shù)字電位計(jì)
英文描述： Digitally Controlled Potentiometer (XDCP)(單DCP,抽頭位置掉電自動(dòng)保存,高輸出端電壓,可部分替代X9312W)
中文描述： 數(shù)控電位器（數(shù)字電位器）（單應(yīng)課稅品許可證，抽頭位置掉電自動(dòng)保存，高輸出端電壓，可部分替代X9312W）
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 269K
代理商： X9318
11 of 22
AN 139
Application Note
www.xicor.com
January, 2001
Figure 9. XDCP Output Overcurrent Control
The PWM comparator inverting input is a voltage
proportional to the 12V output current. Referring to
Figure 4, 12V output current flows in T1 secondary
winding (T1 terminals 9, 11, 13 and 10, 12, 14) when the
switch is ON. Thus T1 primary (T1 terminals 1 and 2)
current and switch current, which are the same value and
are related to the 12V output current by the T1 turns
ratio. T1 primary current flows through R1 to generate a
voltage across R1 proportional to 12V output current.
Returning to Figure 9, this voltage appears at the node of
R1 and R307 and has a waveform shown in the lower left
of Figure 9. The lead edge spike is due to charging of
circuit capacitances at switch turn ON. The positive
slope ramp following the lead edge spike is due to the
current ramping up in T1 primary inductance and in the
output inductor L1, of Figure 4, when the switch is ON.
The Figure 9, R1/R307 node voltage is fed to the PWM
comparator inverting input (U301, pin 3) through two
cascaded integrators formed by R307/C308 and R308/
C306. These integrators attenuate the lead edge spike on
the voltage across R1. The waveform at U301, pin 3 is
illustrated by the solid line in the lower right of Figure 9.
Thus the two PWM comparator inputs are a voltage
proportional to the output of the 12V error amplifier and
a voltage proportional to the 12V output current.
The rising edge of the U301, pin 6 pulse occurs when the
PWM comparator latch is reset at the falling edge of
every other converter frequency clock pulse. The falling
edge of the U301, pin 6 pulse occurs when the inverting
PWM comparator input (voltage proportional to the T1
primary current) becomes higher than the non-inverting
input (voltage proportional to the 12V error amplifier
1000pf
C308
330
R307
100pf
C306
3.32K
R308
40.2K
R309
HIGH
XICOR
X9315
10K
R
H
V
CC
V
SS
R
L
R
W
LOW
PWM
COMPARATOR
SWITCH CURRENT
VOLTAGE AT POINT
ANALOG OF SWITCH CURRENT
TO SWITCH
GATE DRIVE
CLAMPS TO 1V MAX
FROM ERROR AMP
OUTPUT
+
GND
OUT
3
5
I
S
V
R
6
0.5
R1
150
R301
+5V
8
P
F
F
7
TP 301
TP 302
TP 303
8
3
5
47K
R311
47K
R312
U302
47K
R313
t
3.3
C304
4
6
2
1
CS
U/D
INC
U301 (part)
UC3844A
VOLTAGE AT U301, PIN3
WITH XDCP SET HIGH
WITH XDCP SET CENTER
WITH XDCP SET LOW
t
V
V
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