參數(shù)資料
型號(hào)： UPC1933GR
廠商： NEC Corp.
元件分類(lèi)： DC/DC變換器
英文描述： DC-DC CONVERTER CONTROL IC
中文描述： 的DC - DC轉(zhuǎn)換器控制IC
文件頁(yè)數(shù)： 14/20頁(yè)
文件大小： 119K
代理商： UPC1933GR
Data Sheet G13690EJ3V0DS00
14
μ
PC1933
3.4
ON/OFF Control
The ON/OFF control method of the output oscillation is to input the ON/OFF signal from ON as shown in Figure 3
-
2.
Soft start or timer latch (SCP) is internally selected. Soft start is executed when the first start signal is input. When the
end of soft start is detected, the soft start select switch is turned OFF and the timer latch circuit operates.
Figure 3-2 ON/OFF Control
(1) When ON
is high: OFF status
Q
1
: ON
→
DLY pin: Low level
→
Output duty of PWM comparator: 0 %
D
1
: ON
→
I
I
pin: High level
→
FB output: Low level
(2) When ON is low: ON status (start up)
Q
1
: OFF
→
C
DLY
is charged in the sequence of [V
REF
→
R
1
→
SW
→
DLY pin
→
C
DLY
]
→
Soft start
D
1
: OFF
→
I
I
pin: Low level
→
FB output: High level
(3) When ON
goes high again after start up (SW: OFF): OFF status
Q
1
: ON
→
DLY pin: Low level (Nothing happens because SW is OFF.)
D
1
: ON
→
I
I
pin: High level
→
FB output: Low level
→
PWM comparator output duty: 0 %
→
Converter output voltage (V
O
) drops.
Caution Even if start up is executed by making ON low again after (3), soft start is not executed because the
soft start select switch (SW) remains OFF. To execute soft start again, drop V
CC
to 0 V once.
+
+
–
+
–
–
+
V
O
D
1
ON
Q
1
Q
PWM comparator
SCP comparator
C
DLY
DLY
R
2
R
FB
SW
V
REF
R
1
I
I
0.3 V
0.63 V
Error amplifier
To output stage
(Converter
output
voltage)
Dead time
setting: 85 %
(internally fixed)
Oscillation section
(common to each channel)
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