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参数资料
| 型号： | MAX775CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16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
V IN
V IN
1 OUT
V+
SHDN MAX775 CS 6
MAX776
REF
8
FB MAX776
8
C1
150 μ F
C2
0.1 μ F
C3
0.1 μ F
3
4
FB EXT
MAX774
GND
5
2 7
L1
22 μ H
R1
0.07 ?
Q1
Si9435
P
1N5822/
MBR340
V OUT
C4 *
C1
150 μ F
R2
C2
0.1 μ F
1
3
2
R1
4
C3
0.1 μ F
5
OUT V+
SHDN MAX774
MAX775 CS 6
7
EXT
REF
GND
L1
22 μ H
R3
0.07 ?
Q1
Si9435
P
1N5822/
MBR340
C4 *
V OUT
* MAX774 = 330 μ F, 10V
MAX775, MAX776 = 120 μ F, 20V
* MAX774 = 330 μ F, 10V
MAX775, MAX776 = 120 μ F, 20V
PRODUCT
MAX774
MAX775
MAX776
OUTPUT
VOLTAGE (V)
-5
-12
-15
INPUT
VOLTAGE (V)
3 to 15
3 to 8
3 to 5
OUTPUT
CURRENT (A)
1
0.5
0.4
Figure 4. Nonbootstrapped Operation (V IN > 4.5V)
for the next pulse will equal the full current limit.
With heavy loads, the MOSFET first switches twice at
one-half the peak current value. Subsequently, it stays
NOTE: Si9435 HAS V GS OF 20V MAX
Figure 2. Bootstrapped Connection Using Fixed Output
Voltages
V IN
on until the switch current reaches the full current limit,
and then turns off. After it is off for 2.3μs, the MOSFET
switches on once more, and remains on until the switch
current again reaches its limit. This cycle repeats until
the output is in regulation.
A benefit of this control scheme is that it is highly effi-
cient over a wide range of input/output ratios and load
currents. Additionally, PFM converters do not operate
1 OUT
V+ 5
with constant-frequency switching, and have relaxed
MAX776
FB
EXT
REF
8
C1
150 μ F
R2
C2
0.1 μ F
R1
C3
0.1 μ F
3 SHDN MAX774
MAX775 CS 6
2
7
4
GND
L1
22 μ H
R3
0.07 ?
Q1
Si9435
P
1N5822/
MBR340
C4 *
V OUT
stability criterion (unlike PWM converters). As a result,
their external components require smaller values.
With PFM converters, the output voltage ripple is not
concentrated at the oscillator frequency (as it is with
PWM converters). For applications where the ripple fre-
quency is important, the PWM control scheme must be
used. However, for many other applications, the smaller
capacitors and lower supply current of the PFM control
scheme make it the better choice. The output voltage
* MAX774 = 330 μ F, 10V
MAX775, MAX776 = 120 μ F, 20V
Figure 3. Bootstrapped Connection Using External Feedback
Resistors
the current limit for the first two pulses is set to one-half
the peak current limit. If those pulses bring the output
voltage into regulation, the voltage comparator keeps
the MOSFET off, and the current limit remains at one-half
the peak current limit. If the output voltage is out of
regulation after two consecutive pulses, the current limit
ripple with the MAX774/MAX775/MAX776 can be held
quite low. For example, using the circuit of Figure 2,
only 100mV of output ripple is produced when generat-
ing a -5V at 1A output from a +5V input.
Bootstrapped vs.
Nonbootstrapped Operation
Figures 2 and 3 are the standard application circuits
for bootstrapped mode, and Figure 4 is the circuit for
nonbootstrapped mode. Since EXT is powered by OUT,
using bootstrapped or nonbootstrapped mode will
directly affect the gate drive to the FET. EXT swings
from V+ to V OUT . In bootstrapped operation, OUT is
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX775CSA+ | 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 |
| MAX775CSA+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 |
| MAX775CSA-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 |
| MAX775EPA | 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 |
| MAX775ESA | 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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