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参数资料
| 型号： | FA13842N |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 6/15页 |
| 文件大小： | 151K |
| 代理商： | FA13842N |
FA13842, 13843, 13844, 13845
14
Fig. 22
Fig. 23
Fig. 24
to
t1
iL
Converge
iLs
iL
-Kc
Lu
Ton
T
to
t1
Compensated
-Ld
Is
Vcc
ENB 2.5V
5VREF
ENB
OUTPUT
UVLO
OSC
30V
RT/CT
FB
COMP
ISNS
VREF
OUT
GND
ER AMP 2R
C10
Rs
R18
MOSFET
1R
1V
S
FF
Q
QB
R
Vcc
Vin
VCC
UVLO
Output
R25
R24
R27
R26 C13
Tr7
7
4
2
1
8
6
5
3
RT
CT
Fig. 25
Vcc
ENB 2.5V
5VREF
ENB
OUTPUT
UVLO
OSC
30V
RT/CT
FB
COMP
ISNS
VREF
OUT
GND
ER AMP 2R
C10
Rs
R18
MOSFET
1R
1V
S
FF
Q
QB
R
Vcc
Vin
VCC
UVLO
Output
R25
R24
R27
R26 C13
Tr7
7
8
6
5
4
2
1
3
RT
CT
Fig. 22 illustrates a case when the inductor current variation
iL’ at t1 is smaller than iL at t0. In this case, inductor current
variations gradually converges and the inductor current
becomes stable.
It is necessary to apply slope compensation to the control
signals in order to prevent such subharmonic oscillations when
the inductor current is continuous and the duty cycle is greater
than 50%.
The waveform of the inductor current when slope
compensation is applied is shown in Fig. 23.
Slope compensation adds the negative slope of inclination
–Kc to the control signal of the inductor peak current.
iL’ shows the variation of the inductor current at t1 when
slope compensation is not applied, and
iL’ s shows the
variation of the inductor current at t1 when slope compensation
is applied.
Thus,
iL’ can be changed by –Kc, and IL’ s becomes smaller
when –Kc is large. It is necessary to apply slope
compensation to satisfy the equation
iL ≥ iL’s, that is,
I –Kc I
≥ I –1/2 Ld I
as the condition which achieves stable
operation.
Typical circuits are shown in Fig. 24 and 25.
相关PDF资料 |
PDF描述 |
|---|---|
| FA13843N | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA13844N | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA13845N | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA13842P | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDIP8 |
| FA13845P | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDIP8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FA13842N-D1 | 制造商:Fuji Electric 功能描述: |
| FA13842P | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:CMOS IC(For Switching Power Supply Control) |
| FA13842P-D1 | 制造商:Fuji Electric 功能描述: |
| FA13843 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:电源电路，类似UA3843 |
| FA13843N | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:CMOS IC(For Switching Power Supply Control) |
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