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| 型号： | MAX1716EEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
DL
CS
N
REF
VPS
R3
C REF
0.22 μ F
MAX1716
MAX1854
R1
R SENSE
MAX1716
MAX1854
DL
Q2
R1
MAX1855
VPS
MAX1855
CS
? ?
R 2 = R 1 ?
?
R2
PGND
a) SCALED VOLTAGE POSITION SIGNAL
Figure 6. Voltage-Positioning Configurations
the complete expression for the voltage-positioned out-
put depends only upon the value of the current-sense
resistor and the load current:
V OUT ≈ V OUT(PROG) (1 - A VPS I LOAD R SENSE )
Some applications require the addition of a positive off-
set to the output voltage to ensure that it remains within
the load specifications. The positive offset may be gen-
erated by connecting a resistive divider from REF to
VPS to CS (Figure 6a). Set R1 to 1k ? , and use the fol-
lowing equation to calculate R3:
R SENSE
PGND
b) POSITIVE NO-LOAD VOLTAGE POSITIONING
to VPS to PGND (Figure 6b). Set R1 to 1k ? , and use the
following equation to calculate R2:
ESR COUT
? ? A VPS V OUT ( PROG ) R SENSE ? ESR COUT ? ?
The MAX1716/MAX1854/MAX1855 voltage-positioning
circuit has several advantages over older circuits,
which added a fixed voltage offset on the sense point
and used a low-value resistor in series with the output.
The new circuit can use the same current-sense resis-
R 3 = R 1 ?
? 1 ?
? V REF A VPS V OUT(PROG)
? V OFFSET
?
?
tor for both voltage positioning and current-limit detec-
tion. This simultaneously provides accurate current
limiting and voltage positioning. Since the new circuit
where V REF is typically 2.0V, and V OFFSET is the
required positive offset voltage. When attenuating the
voltage-positioning signal, replace R1 with the parallel
combination of R1 and R2 (R1//R2), where R2 is the
attenuation resistor (Figure 6b).
After a load transient, the output instantly changes by
ESR COUT × ? I LOAD . Setting the load-dependent volt-
age position to match this initial load step allows the
output voltage to change by ESR COUT × ? I LOAD and
stay there as long as the load remains unchanged (see
Voltage Positioning and Effective Efficiency ). To set the
voltage position equal to the initial voltage drop gener-
ated by the output capacitor ’ s ESR, select R SENSE =
ESR COUT / (V OUT(PROG) × A VPS ).
For applications using a larger current-sense resistor,
adjust V VPS by connecting a resistive divider from CS
adjusts the output voltage within the control loop, the
voltage-positioning signal may be internally amplified.
The additional gain allows the use of low-value current-
sense resistors, so the power dissipated in this sense
resistor is significantly lower than a single resistor con-
nected directly in series with the output.
Voltage-Positioning Compensation (CC)
The voltage-positioning compensation capacitor filters
the amplified VPS signal, allowing the user to adjust the
dynamics of the voltage-positioning loop. The imped-
ance at this node is approximately 200k ? , so the pole
provided by this node can be approximated by 1 / (2 ×
π × RC). The response time is set with a 47pF to
1000pF capacitor from CC to GND.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1716EEG+ | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1716EEG+T | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1716EEG-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX17175ETG+ | 制造商:Maxim Integrated Products 功能描述:BOOST REG W/INTEGRATED CHARGE PUMPS SWITCH CONTROL & HIGH-CU - Rail/Tube |
| MAX1717BEEG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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