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参数资料
| 型号： | MAX5951ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 88% |
| 电源电压： | 4.5 V ~ 16 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
12V/5V Input Buck PWM Controller
Compensation when f C < f ZESR
Figure 5 shows the error-amplifier feedback, as well as
its gain response for circuits that use low-ESR output
capacitors (ceramic). In this case, f C occurs before
f ZESR .
f Z1 is set to 0.5 x f LC and f Z2 is set to f LC in order to
compensate for the gain-and-phase loss due to the
double pole. Choose the inductor (L) and output
capacitor (C OUT ) as described in the Inductor
Selection and Output Capacitor Selection sections.
Pick a value for the feedback resistor R5 in Figure 5
(values between 1k ? and 10k ? are adequate). C7 is
then calculated as:
Compensation when f C > f ZESR
For larger ESR capacitors such as tantalum and alu-
minum electrolytic, f ZESR can occur before f C . If f C >
f ZESR , then f C occurs between f P2 and f P3 . f Z1 and f Z2
remain the same as before; however, f P2 is now set
equal to f ZESR . The output capacitor’s ESR zero fre-
quency is higher than f LC but lower than the closed-
loop crossover frequency. The equations that define
the error amplifier’s poles and zeros (f Z1 , f Z2 , f P1 , f P2 ,
and f P3 ) are the same as before. However, f P2 is now
lower than the closed-loop crossover frequency. Figure
5 shows the error-amplifier feedback, as well as its gain
response for circuits that use higher ESR output capac-
itors (tantalum, aluminum electrolytic, etc.).
C 7 =
1
2 π × 0 . 5 × f LC × R 5
Pick a value for feedback resistor R5 in Figure 5 (values
between 1k ? and 10k ? are adequate). C7 is then cal-
culated as:
f C occurs between f Z2 and f P2 . The circuit is imple-
mented with C7 >> C8 and R3 >> R6, in which case,
C 7 =
1
2 π × 0 . 5 × f LC × R 5
G MOD ( fC ) =
G MOD ( fC ) =
C 6 = C OUT
R 5 × G MOD ( DC )
R 3 ≈
C OUT × ESR
the error amplifier gain (G EA ) at f C is due primarily to
C6 and R5. Therefore:
G EA ( fc ) = 2 π × f C × C 6 × R 5
The modulator gain at f C is:
G MOD ( DC )
( 2 π ) 2 × L × C OUT × f C 2
Since G EA(fC) x G MOD(fC) = 1, C6 is calculated by:
f × L × C × 2 π
R 5 × G MOD ( DC )
R3 is then calculated as:
1
2 π × f LC × C 6
f P2 is set at 1/2 the switching frequency (f SW ). R6 is
then calculated by:
The circuit is implemented with C7 >> C8 and R3 >>
R6, in which case the error-amplifier gain between f P2
and f P3 is approximately equal to:
R5
R 6
The modulator gain at f C is:
G MOD ( DC )
( 2 π ) 2 × L × C OUT × f C 2
Since G EA(fC) x G MOD(fC) = 1, R6 can then be calculat-
ed as:
R 6 ≈
( 2 π ) 2 × L × C OUT × f C 2
f P2 is set to f ZESR . C6 is then calculated as:
C 6 =
R 6
R3 is then calculated as:
R 6 =
1
2 π × C 6 × 0 . 5 × f SW
R 3 ≈
1
2 π × f LC × C 6
C 8 =
C 8 =
f P3 is set at 5 x f C . Therefore, C8 is calculated as:
1
2 π × R 5 × 5 × f C
f P3 is set at 5 x f C . Therefore, C8 is calculated as:
1
2 π × R 5 × 5 × f C
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5951ETJ+ | 功能描述:电压模式 PWM 控制器 12V/5V Buck PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5951ETJ+T | 功能描述:电压模式 PWM 控制器 12V/5V Buck PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5951ETJ-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5952AEAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5952AEAX+CK8 | 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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