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参数资料
| 型号： | MAX5950ETJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/28页 |
| 文件大小： | 552K |
| 描述： | IC PWM CTRL HOT-SW 12V 32TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电源电压： | 8 V ~ 16 V，±5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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12V PWM Controller with Hot-Swap
20 ______________________________________________________________________________________
Compensation when f
C
< f
ZESR
Figure 6 shows the error-amplifier feedback, as well as its
gain response for circuits that use low-ESR output capac-
itors (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
to compen-
sate 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 feedback resistor R5 in Figure 6 (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 the
error-amplifier gain (G
EA
) at f
C
is due primarily to C6
and R5. Therefore:
The modulator gain at f
C
is:
Since G
EA(fC)
x G
MOD(fC)
= 1, C6 is calculated by:
R3 is then calculated as:
f
P2
is set at 1/2 the switching frequency (f
SW
). R6 is
then calculated by:
f
P3
is set at 5xf
C
. Therefore, C8 is 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
, 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 capacitors ESR zero fre-
R
f
8
1
2
5 5
=
?nbsp ?nbsp ?/DIV>
?/DIV>
C
f
SW
6
1
2
6 0 5
=
?nbsp ?/DIV>
?/DIV>
.
R
f
C
LC
3
1
2
6
H
?nbsp ?/DIV>
?/DIV>
C
f L C
R G
C
OUT
MOD DC
6
2
5
=
?nbsp ?/DIV>
?/DIV>
?/DIV>
?/DIV>
( )
G
G
L C
f
MOD fC
MOD DC
OUT C
( )
( )
( )
=
?nbsp ?/DIV>
?/DIV>
2
2
2
?/DIV>
G
f C R
EA fc
C
( )
= ?nbsp ?nbsp ?/DIV>
2
6 5
?/DIV>
f
R
LC
7
1
2 0 5
5
=
?nbsp ?nbsp ?/DIV>
?nbsp .
GAIN
(dB)
V
OUT
REF
R3
COMP
R6
R5
C6
R4
FREQUENCY
CLOSED-LOOP
GAIN
EA
GAIN
f
Z1
f
Z2
f
C
f
P2
f
P3
C8
EA
C7
Figure 7. Error-Amplifier Compensation Circuit (Closed-Loop
and Error-Amplifier Gain Plot) for Higher ESR Output Capacitors
GAIN
(dB)
V
OUT
REF
R3
COMP
R6
R5
C6
R4
FREQUENCY
CLOSED-LOOP
GAIN
EA
GAIN
f
Z1
f
Z2
f
C
f
P2
f
P3
C8
EA
C7
Figure 6. Error Amplifier Compensation Circuit (Closed-Loop
and Error-Amplifier Gain Plot) for Ceramic Capacitors
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5950EVKIT | 制造商:Maxim Integrated Products 功能描述:12V PWM CONTROLLER WITH HOT-SWAP - Rail/Tube |
| MAX5951ETJ | 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 |
| 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 |
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