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參數(shù)資料
| 型號： | MAX5950ETJ+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 552K |
| 描述： | IC PWM CTRL HOT-SW 12V 32TQFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用型，PCI Express? |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 8 V ~ 16 V，±5V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFN-EP（5x5） |
| 包裝： | 管件 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5950ETJ+ | 功能描述:電壓模式 PWM 控制器 12V PWM Controller w/Hot-Swap RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX5950ETJ+T | 功能描述:電壓模式 PWM 控制器 12V PWM Controller w/Hot-Swap RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX5950ETJ-T | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX5950EVKIT | 制造商:Maxim Integrated Products 功能描述:12V PWM CONTROLLER WITH HOT-SWAP - Rail/Tube |
| MAX5951ETJ | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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