參數(shù)資料
型號: CS51221ED16
廠商: ZF Electronics Corporation
英文描述: Enhanced Voltage Mode PWM Controller
中文描述: 增強的電壓模式PWM控制器
文件頁數(shù): 11/12頁
文件大?。?/td> 164K
代理商: CS51221ED16
Application Information: continued
C
Figure 10. The design of feedback voltage divider has to consider the
error amplifier input current.
Design voltage dividers for OV and UV detection
In Fig.11, the voltage divider uses three resistors in series
to set OV and UV threshold seen from the input voltage.
The values of the resistors can be calculated from the fol-
lowing three equations, where the third equation is
derived from OV hysteresis requirement.
V
IN(LOW)
×
= 1V
(A)
V
IN(HIGH)
×
= 2V
(B)
12.5μA
× (
R1 + R2) = V
HYST
(C)
where
V
LINE(LOW)
, V
LINE(HIGH)
= input voltage OV and UV threshold
V
HYST
= OV hysteresis seen at V
IN
It is self-evident from equation A and B that to use this
design, V
IN(HIGH)
has to be two times greater than
V
IN(LOW)
. Otherwise, two voltage dividers have to be used
to program OV and UV separately.
Figure 11. OV /UV Monitor Divider.
V
IN
V
UV
V
OV
R
3
R
2
R
1
)
R3
R2 + R3 + R1
(
)
R2 + R3
R2 + R3 + R1
(
+
-
COMP
Ier
1.27
FB
R2
R1
V
OUT
-+
Ri
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CS51221ED16G 功能描述:電壓模式 PWM 控制器 Enhanced Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
CS51221EDR16 功能描述:電壓模式 PWM 控制器 Enhanced Current RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
CS51221EDR16G 功能描述:電壓模式 PWM 控制器 Enhanced Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
CS51221EDTB16G 功能描述:電壓模式 PWM 控制器 ANA PWM CTR TSSOP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
CS51221EDTB16R2G 功能描述:電壓模式 PWM 控制器 ANA PWM CTR TSSOP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel