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參數(shù)資料
| 型號(hào)： | L5981TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 1.08 MM HEIGHT, LEAD FREE, VFQFPN-8 |
| 文件頁數(shù)： | 9/37頁 |
| 文件大?。?/td> | 714K |
| 代理商： | L5981TR |
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L5981
Application information
Doc ID 13004 Rev 6
17/37
5.4
Compensation network
The compensation network has to assure stability and good dynamic performance. The loop
of the L5981 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 (see Figure 9).
The transfer function of the PWM modulator, from the error amplifier output (COMP pin) to
the OUT pin, results:
Equation 10
generates a sawtooth amplitude directly proportional to the input voltage, that is:
Equation 11
In this way the PWM modulator gain results constant and equals to:
Equation 12
The synchronization of the device with an external clock provided trough SYNCH pin can
modifies the PWM modulator gain (see Chapter 4.1 to understand how this gain changes
and how to keep it constant in spite of the external synchronization).
Figure 9.
The error amplifier, the PWM modulator and the LC output filter
The transfer function on the LC filter is given by:
G
PW0
V
IN
V
s
---------
=
V
S
KV
IN
=
G
PW0
V
IN
V
s
---------
1
K
----
9
==
=
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
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| L5983 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A STEP-DOWN SWITCHING REGULATOR 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 |
| L5983_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.5 A step-down switching regulator |
| L5983TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5a Step-Down Switching Reg 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 |
| L5985 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2A STEP-DOWN SWITCH REGULATOR 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 |
| L5985_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A step-down switching regulator |
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