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參數(shù)資料
| 型號： | NE5560 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Switched-mode power supply control circuit |
| 中文描述： | 開關(guān)電源控制電路 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 240K |
| 代理商： | NE5560 |
Philips Semiconductors
Product specification
NE/SE5560
Switched-mode power supply control circuit
1994 Aug 31
14
that it does not saturate, even under transient conditions, where the
max. inductance is determined by
δMAX×VIN max. A regulation of
δMAX~1/VIN will allow for a considerable reduction or simplification of
the transformer. The function of
δ~1/VIN can be realized by using
Pin 16 of the NE5560.
ON
T
δ1
δ2
δ3
(50)
SL00378
Figure 19. Output Stage Inhibit
Figure 20 shows the electrical realization. When the voltage at Pin
16 exceeds the stabilized voltage VZ (Pin 2), it will increase the
charging current for the timing capacitor on Pin 8.
The operating frequency is not affected, because the upper trip level
for sawtooth increases also. Note that the
δMAX voltage on Pin 6
remains constant because it is set via VZ. Figure 21 visualizes the
effect on
δMAX and the normal operating duty cycle δ. For V16=2×VZ,
these duty cycles have halved. The graph for
δ=f(V16) is given in
Figure 22.
NOTE:
V16 must be less than Pin 1 voltage.
APPLICATIONS
NE/SE5560 Push-Pull Regulator
This application describes the use of the Philips Semiconductors
NE/SE5560 adapted to function as a push-pull switched mode
regulator, as shown in Figures 23 and 24.
Input voltage range is +12V to +18V for a nominal output of +30V
and -30V at a maximum load current of 1A with an average
efficiency of 81%.
Features include feed-forward input compensation, cycle-to-cycle
drive current protection and other voltage sensing, line (to positive
output) regulation <1% for an input range of +13V to +18V and load
regulation to positive output of <3% for
IL(+) of 0.1 to 1A.
The main pulse-width modulator operates to 48kHz with power
switching at 24kHz.
FEED-FORWARD
16
2
6
7
8
DO NOT EXCEED VCC
CSS
R1
R2
RT
CT
δMAX
INPUT
SL00379
Figure 20. External
δ Maximum Control
WORKING
δ LEVEL
δMAX
LEVEL
d
MAX
1
d
MAX
2
VZ
V16
2XVZ
T
SL00380
Figure 21. Feed-Forward Circuitry
DUTY
CYCLE
100
90
80
70
60
50
40
30
20
10
1
1.5
2
2.5
V
16
V
Z
δ
SL00381
Figure 22. Feed-Forward Regulation
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| NE5560D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PACKAGE INFORMATION |
| NE5560F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LINEAR INTEGRATED CIRCUITS |
| NE5560N | 制造商: 功能描述: 制造商:undefined 功能描述: |
| NE5561 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Switched-mode power supply control circuit |
| NE556-1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual timer |
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