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参数资料
| 型号： | MAX776CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 300kHz |
| 占空比： | 85% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low I Q Inverting DC-to-DC Controllers
700
600
500
400
R SENSE = 0.05 ?
R SENSE = 0.06 ?
R SENSE = 0.07 ?
V OUT = -15V
800
600
400
V OUT = -24V
R SENSE = 0.05 ?
R SENSE = 0.06 ?
R SENSE = 0.07 ?
300
200
200
R SENSE = 0.08 ?
R SENSE = 0.08 ?
100
R SENSE = 0.09 ?
0
R SENSE = 0.09 ?
3
4
5 6
7
3 4
5 6
7 8 9 10 11 12 13 14 15
INPUT VOLTAGE (V)
Figure 8. MAX776 Maximum Output Current vs. Input Voltage
(V OUT = -15V)
To choose the proper current-sense resistor, simply fol-
low the two-step procedure outlined below:
1) Determine:
? Input voltage range, V+
? Maximum (absolute) output voltage, V OUT
? Maximum output current, I LOAD
For example, let V+ range from 4V to 6V, and
choose V OUT = -24V and I OUT = 150mA.
2) Next, referring to Figure 9, find the curve with the
lowest current limit whose output current (with the
lowest input voltage) meets your requirements.
In our example, a curve where I OUT is >150mA with a
4V input and a -24V output is optimal.
The R SENSE = 80m ? (Figure 9) shows only approxi-
mately 125mA of output current with a 4V input, so we
look next at the R SENSE = 70m ? line. It shows I OUT
>150mA for V+ = 4V and V OUT = -24V. The current limit
will be 0.210V / 0.070 ? = 3A. These curves take into
account worst-case inductor (±10%) and current-
sense trip levels, but not sense-resistor tolerance. The
switch on resistance is 70m ? .
Standard wire-wound and metal-film resistors have
an inductance high enough to degrade performance.
Metal-film resistors are usually deposited on a ceramic
rod in a spiral, making their inductances relatively high.
Surface-mount (or chip) resistors have very little induc-
tance and are well suited for use as current-sense
INPUT VOLTAGE (V)
Figure 9. MAX774/MAX775/MAX776 Maximum Output Current
vs. Input Voltage (V OUT = -24V)
resistors. To use through-hole resistors, IRC has a wire
resistor that is simply a band of metal shaped as a “U”
so that inductance is less than 10nH (an order of mag-
nitude less than metal-film resistors). These are avail-
able in resistance values between 5m ? and 0.1 ? .
External Switching Transistor
The MAX774/MAX775/MAX776 are capable of driving
P-channel enhancement-mode MOSFET transistors only.
The choice of power transistor is dictated by input and
output voltage, peak current rating, on-resistance, gate-
source threshold, and gate capacitance. The drain-to-
source rating must be greater than the V+ - V OUT
input-to-output voltage differential. The gate-to-source
rating must be greater than V+ (the source voltage) plus
the absolute value of the most negative swing of EXT.
For bootstrapped operation, the most negative swing of
EXT is V OUT . In nonbootstrapped operation, this may be
ground or some other negative voltage. Gate capaci-
tance is not normally a limiting factor, but values should
be less than 1nF for best efficiency. For maximum effi-
ciency, the MOSFET should have a very-low on-resis-
tance at the peak current and be capable of handling
that current. The transistor chosen for the typical operat-
ing circuit has a 30V drain-source voltage limit and a
0.07 ? drain-source on-resistance at V GS = -10V.
Table 1 lists suppliers of switching transistors suitable
for use with the MAX774/MAX775/MAX776.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX776CSA+ | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller 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 |
| MAX776CSA+T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller 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 |
| MAX776CSA-T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller 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 |
| MAX776CSA-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX776EPA | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller 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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