NE5560 데이터 시트보기 (PDF) - Philips Electronics
부품명
상세내역
일치하는 목록
NE5560 Datasheet PDF : 16 Pages
| |||
Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
∆VO/VREF (%)
7
6
5
4
4
R1
3
RS
–
2
3+
VREF(3.72V)
0.19
0.8
0.7
0.6
0.5
0.4
0.3
0.2
Rf
RS + 20
Rf
RS + 100
Rf
RS + 500
0.1
δ
10 20 30 40 50 60 70 80 90
a. Duty Cycle — δ — % Regulation
3.72V
+
ERROR
AMP
3
–
START/
STOP
(+)
PWM
OUT
RESET
(–)
(–) O.C. (–)
8
4
5
6
b. Pulse-Width Modulation
Figure 10.
SL00369
δ (%)
100
90
80
70
60
50
40
30
20
10
0
V4,5,6 (V)
1
2
3
4
5
6
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 δMAX 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.
1994 Aug 31
10
Share Link: 