參數(shù)資料
型號： MAX1729
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號處理
英文描述： Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0
中文描述： ECB及LCD偏置電源，帶有精確的輸出電壓及溫度補(bǔ)償
文件頁數(shù)： 8/12頁
文件大?。?/td> 158K
代理商： MAX1729
M
To use a DC control signal to adjust the output voltage,
use the circuit shown in Figure 4. In this configuration,
V
OUT
is governed by the following equation:
The impedance looking into COMP is nominally 33k
.
A source output impedance of less than 500
is rec-
ommended. Also, ensure V
OUT
≤
18V by keeping
V
COMP
above 0.6V.
Designing for External Feedbac k Mode
To solve for V
OUT
in external feedback mode, assume
the current into the FB pin is zero and the voltage at FB
is 1.228V. Then take the sum of the currents into FB
and solve for V
OUT
:
3
4
Using the following formulas, calculate the external
component values required for MAX1729 operation in
external feedback mode, as shown in Figure 3. An
example follows the formulas.
External Component Value Formulas
1) Given the maximum output voltage needed (V
MAX
),
choose the maximum feedback current and solve for
R1 (10μA to 30μA is recommended for maximum feed-
back current) as follows:
V
MAX
R1 =
- V
I
FB
FB
V
= R1
1
R1
1
R2
1
+
R
R
1
R5
V
R1
+
R
R
V
R1
R5
V
OUT
FB
COMP
TC
+
+
+
3
4
V
24.67V
- 22.71V
OUT
FB
COMP
≈
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
8
_______________________________________________________________________________________
PS
OUT
FB
COMP
LX
L1
220
μ
H
TC
CTLIN
DIGITAL
PWM
CONTROLLER
GND
IN
V
IN
C1
0.1
μ
F
C2
0.068
μ
F
C4
1
μ
F
C6
1
μ
F
C3
0.1
μ
F
C5
1000pF
V
OUT
MAX1729
REF
ADC
Figure 2. Internal Feedback Mode
PS
OUT
FB
TC
LX
L1
220
μ
H
COMP
CTLIN
PWM
GENERATOR
GND
IN
V
IN
R4
R3
C1
0.1
μ
F
C2
0.068
μ
F
C4
1
μ
F
R1
R5
R2
C6
1
μ
F
C3
0.1
μ
F
V
OUT
MAX1729
C5
1000pF
REF
Figure 3. External Feedback Mode
PS
OUT
FB
COMP
LX
L1
TC
CTLIN
GND
IN
220
μ
H
V
IN
C1
0.1
μ
F
C2
0.068
μ
F
C4
1
μ
F
V
COMP
DC CONTROL
INPUT
C3
0.1
μ
F
C5
1000pF
V
OUT
MAX1729
REF
Figure 4. Using a DC Control Signal
相關(guān)PDF資料
PDF描述
MAX1729EUB ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation
MAX1734EUK15 Low-Voltage, Step-Down DC-DC Converters in SOT23
MAX1733EUK-T Low-Voltage, Step-Down DC-DC Converters in SOT23
MAX1734EUK18 Low-Voltage, Step-Down DC-DC Converters in SOT23
MAX1734EUK__-T Low-Voltage, Step-Down DC-DC Converters in SOT23
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1729EUB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 ECB & LCD Display Bias Supply RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1729EUB-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 ECB & LCD Display Bias Supply RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX172ACNG 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX172ACNG+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX172ACWG 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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