參數(shù)資料
型號(hào)： UPC1935
廠商： NEC Corp.
元件分類： 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
文件頁數(shù)： 17/28頁
文件大小： 185K
代理商： UPC1935
Data Sheet G13418EJ3V0DS00
17
μ
PC1935
3.5
ON/OFF Control
3.5.1
Channel 1 (for step-up)
The ON/OFF signal control method of the output oscillation of channel 1 is to input the ON/OFF signal from ON
1
as
shown in Figure 3-3. For channel 1, 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 3-3 ON/OFF Control (channel 1 for step-up)
(1) When ON
1
is high: OFF status
Q
11
: ON
→
DLY pin: Low level
→
Output duty of PWM comparator: 0 %
D
11
: ON
→
I
I1
pin: High level
→
FB
1
output: Low level
(2) When ON
1
is low: ON status (start up)
Q
11
: OFF
→
C
DLY
is charged in the sequence of [V
REF
→
R
1
→
SW
→
DLY pin
→
C
DLY
]
→
Soft start
D
11
: OFF
→
I
I1
pin: Low level
→
FB
1
output: High level
(3) When ON
1
goes high again after start up (SW: OFF): OFF status
Q
11
: ON
→
DLY pin: Low level (Nothing happens because SW is OFF.)
D
11
: ON
→
I
I1
pin: High level
→
FB
1
output: Low level
→
PWM comparator output duty: 0 %
→
Converter output voltage (V
O1
) drops.
Caution Even if start up is executed by making ON
1
low again after (3), soft start is not executed because the
soft start select switch (SW) remains OFF. To execute soft start of channel 1 again, drop V
CC
to 0 V
once.
+
+
–
+
–
–
+
V
O1
D
11
ON
1
Q
11
Q
1
PWM comparator
SCP comparator
(common to each channel)
C
DLY
DLY
R
12
R
1
FB
1
SW
V
REF
R
11
I
I1
0.3 V
0.63 V
Error amplifier
To output stage
Oscillation section
(common to each channel)
Dead time
setting: 85 %
(internally fixed)
(Converter
output
voltage)
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