音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

71128 Datasheet

  • 71128

  • Simple Solution for Dynamically Programming the Output Volta...

  • 7頁

  • VISHAY   VISHAY

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

AN731
Vishay Siliconix
Simple Solution for Dynamically Programming the
Output Voltage of DC-DC Converters
INTRODUCTION
Figure 1 shows a typical dc-to-dc converter configuration. As in
many PWM controllers, the non-inverting input of the voltage
feedback error amplifier is internally connected to the
reference voltage, V
r
. The output voltage of the converter is set
by a resistor divider network R1 and R2. This configuration
enables a fixed output voltage that is equal to or greater than
the reference voltage. But in many power conversion designs,
it is useful to vary the output to a value lower than the reference
voltage and to dynamically adjust the output voltage. The
op-amp circuit shown in Figure 3 gives designers a simple way
to do this. Scaling the output voltage with respect to a control
voltage V
C
is totally flexible. This application note describes
how to use this simple solution and provides a step-by-step
design procedure to assist designers in calculating the specific
parameters required by their circuits.
DESIGN REQUIREMENT
Reference voltage, V
r
Control voltage: V
C
= V
C1
to V
C2
Output voltage: V
O
= V
O1
at V
C
= V
C1
, V
O
= V
O2
at V
C
= V
C2
,
and V
O
is linear for any value of V
C
in its range.
These design requirements are shown in Figure 2. The output
voltage is a linear function with respect to the control voltage.
The function crosses two end points A = (V
C1
, V
O1
) and B =
(V
C2
, V
O2
).
V
IN
Power Stage
V
OUT
V
O
(V)
B (V
C2
, V
O2
)
R1
PWM
FB
鈥?/div>
+
V
r
R2
EA
PWM Controller
A (V
C1
, V
O1
)
V
C
(V)
FIGURE 1.
Typical DC/DC Converter Configuration
FIGURE 2.
Output Voltage vs Control Voltage Requirement
V
IN
Power Stage
V
OUT
R1
PWM
FB
鈥?/div>
+
A
V
r
R2
B
V
X
LM358
鈥?/div>
+
V
r2
Op-Amp Circuit
R3
EA
PWM Controller
R4
V
C
FIGURE 3.
Op-Amp Circuit Offers Programmable Output Function
Document Number: 71128
28-Jan-00
www.vishay.com
S
FaxBack 408-970-5600
1

71128 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • -

  • 散裝

  • 停產(chǎn)

  • 刀頭，插件

  • 十字

  • #3

  • 1/4"

  • 1.00"（25.4mm）

  • 防打滑，耐沖擊

  • 10

71128相關(guān)型號PDF文件下載

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號，
第一時(shí)間獲取資訊。

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！