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| 型号： | L5989DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, HTSSOP-16 |
| 文件页数： | 20/51页 |
| 文件大小： | 1947K |
| 代理商： | L5989DTR |
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L5989D
Application information
Doc ID 15778 Rev 3
27/51
system bandwidth the output capacitor provides the current to the load. So if the high slew
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 L5989D 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 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
==
=
相关PDF资料 |
PDF描述 |
|---|---|
| L5989D | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| L5991D013TR | 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6258EX | STEPPER MOTOR CONTROLLER, 1.5 A, PDSO36 |
| L6470PD | STEPPER MOTOR CONTROLLER, 7 A, PDSO36 |
| L6566BTR | 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L5991 | 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L5991_01 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY |
| L5991A | 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L5991AD | 功能描述:开关变换器、稳压器与控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L5991AD13TR | 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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