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參數(shù)資料
| 型號： | L5988D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, HTSSOP-16 |
| 文件頁數(shù)： | 21/52頁 |
| 文件大?。?/td> | 1858K |
| 代理商： | L5988D |
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Application information
L5988D
28/52
Doc ID 15324 Rev 3
rate load transient is required by the application the output capacitor and system bandwidth
have to be chosen in order to sustain load transient and to have a fast response to the
transient.
In the table below some capacitor series are listed.
6.4
Compensation network
The compensation network has to assure stability and good dynamic performance. The loop
of the L5988D is based on the voltage mode control. The error amplifier is a voltage
operational amplifier with high bandwidth. So selecting the compensation network the E/A
will be considered as ideal, that is, its bandwidth is much larger than the system one.
The transfer functions of PWM modulator and the output LC filter are studied. The transfer
function PWM modulator, from the error amplifier output (COMP pin) to the OUT pin, results:
where VS is the sawtooth amplitude and H represent its reliance on the switching frequency.
As seen in Chapter 5.2, the voltage feed forward generates a sawtooth amplitude directly
proportional to the input voltage, that is:
The internal saw tooth is designed in order to have the maximum amplitude at the natural
switching frequency of the device.
At fSW0 = 400 kHz the PWM modulator can be written as:
The synchronization of the device with an external clock fed into the SYNCH pin and the
adjustment of the switching frequency through the FSW pin modify the gain of the internal
saw tooth (see Chapter 5.2).
Table 12.
Output capacitors
Manufacturer
Series
Cap value (
μF)
Rated voltage (V)
ESR (m
Ω)
MURATA
GRM32
22 to 100
6.3 to 25
< 5
GRM31
10 to 47
6.3 to 25
< 5
PANASONIC
ECJ
10 to 22
6.3
< 5
EEFCD
10 to 68
6.3
15 to 55
SANYO
TPA/B/C
100 to 470
4 to 16
40 to 80
TDK
C3225
22 to 100
6.3
< 5
G
PW0 fSW0
()
V
IN
V
s
--------- Hf
SW0
()
=
V
S fSW0
()
KV
IN
Hf
SW0
()
=
G
PW0 400 kHz
()
1
K
----
V
IN
V
S 400 kHz
()
----------------------------------
9
==
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5988DTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5989D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5989DTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5991 | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L5991_01 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY |
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