参数资料
型号: SC34063AP1G
厂商: ON Semiconductor
文件页数: 11/15页
文件大小: 0K
描述: IC REG BUCK BOOST INV ADJ 8DIP
标准包装: 50
类型: 降压(降压),升压(升压),反相
输出类型: 可调式
输出数: 1
输出电压: 1.25 V ~ 40 V
输入电压: 3 V ~ 40 V
频率 - 开关: 33kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
供应商设备封装: 8-PDIP
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Calculation
Step ? Up
Step ? Down
Voltage ? Inverting
in(min)
* V
* V sat
in
t on /t off
V out ) V F
V
in(min)
* V sat
V
V out ) V F
in(min) * V sat * V out
|V out| ) V F
V
ton
) 1
off
ton
) 1
off
ton
) 1
off
(t on + t off )
t off
t on
1
f
t on ) t off
t
(t on + t off ) ? t off
1
f
t on ) t off
t
(t on + t off ) ? t off
1
f
t on ) t off
t
(t on + t off ) ? t off
C T
4.0 x
10 ? 5
t on
4.0 x
10 ? 5
t on
4.0 x 10 ? 5 t on
off
off
I pk(switch)
2I
out(max)
t on
t
) 1
2I
out(max)
2I
out(max)
t on
t
) 1
R sc
0.3/I pk(switch)
0.3/I pk(switch)
0.3/I pk(switch)
pk(switch)
pk(switch)
L (min)
(V
I
in(min) * V sat)
t
on(max)
(V
in(min)
I
* V sat * V out)
pk(switch)
t
on(max)
(V
I
in(min) * V sat)
t
on(max)
pk(switch) on
ripple(pp)
off
C O
9
V
I outt on
ripple(pp)
I
8V
(t ) t
)
9
V
I outt on
ripple(pp)
V out ? Desired output voltage, |V out | + 1.25 1 ) R2
I out ? Desired output current.
V sat = Saturation voltage of the output switch.
V F = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V in ? Nominal input voltage.
R1
f min ? Minimum desired output switching frequency at the selected values of V in and I O .
V ripple(pp) ? Desired peak ? to ? peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the
line and load regulation.
NOTE: For further information refer to Application Note AN920A/D and AN954/D.
Figure 17. Design Formula Table
http://onsemi.com
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