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參數(shù)資料
| 型號(hào)： | SE5560N |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Switched-mode power supply control circuit |
| 中文描述： | 0.04 A SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, SOT-38-4, DIP-16 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 240K |
| 代理商： | SE5560N |
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Philips Semiconductors
Product specification
NE/SE5560
Switched-mode power supply control circuit
1994 Aug 31
10
a. Duty Cycle —
δ
— % Regulation
b. Pulse-Width Modulation
(+)
8
3.72V
3
+
ERROR
AMP
–
PWM
OUT
(–)
(–)O.C.
(–)
START/
STOP
RESET
4
5
6
–
+
7
6
5
4
3
2
1
0.9
0.5
0.4
0.3
0.2
0.1
4
3
R
S
R
1
V
REF
(3.72V)
δ
V
O
/V
REF
(%)
10
20
30
40
50
60
70
80
90
Rf
RS
20
Rf
RS
100
Rf
RS
500
SL00369
Figure 10.
100
90
80
70
60
50
40
30
20
10
0
1
2
3
4
5
6
δ
(%)
V
4,5,6 (V)
SL00370
Figure 11. Transfer Curve of Pulse-Width Modulator
Duty Cycle vs Input Voltage
Extra PWM Input (Pin 5)
The PWM has an additional inverting input: Pin 5. It allows for
attacking the duty cycle via the PWM circuit, independently from the
feedback and the
δ
MAX
information. This is necessary when the
SMPS must have a real constant-current behavior, possibly with a
fold-back characteristic. However, the realization of this feature must
be done with additional external components. When not used, Pin 5
should be tied to Pin 6.
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