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参数资料
| 型号： | L6725A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 11/34页 |
| 文件大小： | 962K |
| 代理商： | L6725A |
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L6725 - L6725A
Application details
19/32
6.2
Output capacitors
The output capacitors are basic components for the fast transient response of the power supply.
For example, during a positive load transient, they supply the current to the load until the
converter reacts. The controller recognizes immediately the load transient and sets the duty
cycle at 100%, but the current slope is limited by the inductor value. The output voltage has a
first drop due to the current variation inside the capacitor (neglecting the effect of the ESL):
Moreover, there is an additional drop due to the effective capacitor discharge that is given by:
Where DMAX is the maximum duty cycle value that in the L6725 is 100%. Usually the voltage
drop due to the ESR is the biggest one while the drop due to the capacitor discharge is almost
negligible. Moreover the ESR value also affects the voltage static ripple, that is:
6.3
Input capacitors
The input capacitors have to sustain the RMS current flowing through them, that is:
Where D is the duty cycle. The equation reaches its maximum value, IOUT /2 with D = 0.5. The
losses in worst case are:
ESR
Iout
Vout
ESR
=
(3)
)
max
min
,
(
2
Vout
D
Vin
Cout
L
Iout
Vout
COUT
=
(4)
L
I
ESR
Vout
=
(5)
)
1
(
D
Iout
Irms
=
(6)
2
)
5
.
0
(
Iout
ESR
P
=
(7)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6725ATR | 功能描述:开关变换器、稳压器与控制器 Step-Down Controller 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 |
| L6725TR | 功能描述:电压模式 PWM 控制器 Adjustable Step Down 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 |
| L6726 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_12 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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