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参数资料
| 型号： | L6919CD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 6/32页 |
| 文件大小： | 558K |
| 代理商： | L6919CD |
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L6919C
14/32
Integrated Droop Function
The device uses a droop function to satisfy the requirements of high performance microprocessors, reducing
the size and the cost of the output capacitor.
This method "recovers" part of the drop due to the output capacitor ESR in the load transient, introducing a de-
pendence of the output voltage on the load current
As shown in figure 8, the ESR drop is present in any case, but using the droop function the total deviation of the
output voltage is minimized. In practice the droop function introduces a static error (VDROOP in figure 8) propor-
tional to the output current. Since the device has an average current mode regulation, the information about the
total current delivered is used to implement the Droop Function. This current (equal to the sum of both IINFOx)
is sourced from the FB pin. Connecting a resistor between this pin and VOUT, the total current information flows
only in this resistor because the compensation network between FB and COMP has always a capacitor in series
(See fig. 9). The voltage regulated is then equal to:
VOUT = VID - RFB IFB
Since IFB depends on the current information about the two phases, the output characteristic vs. load current is
given by:
Figure 8. Output transient response without (a) and with (b) the droop function
Figure 9. Active Droop Function Circuit
The feedback current is equal to 50
A at nominal full load (IFB = IINFO1 + IINFO2) and 70A at the OC intervention
threshold, so the maximum output voltage deviation is equal to:
VFULL_POSITIVE_LOAD = -RFB 50A
VOC_INTERVENTION = -RFB 70A
Droop function is provided only for positive load; if negative load is applied, and then IINFOx < 0, no current is
sunk from the FB pin. The device regulates at the voltage programmed by the VID.
V
OUT
VID
R
FB
R
SENSE
Rg
----------------------
I
OUT
–
=
VMAX
VMIN
VNOM
(a)
(b)
ESR DROP
VDROOP
VPROG
COMP
FB
To VOUT
IFB
RFB
ZF
相关PDF资料 |
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|---|---|
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| L6920D | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920 | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6924D013TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6919CDTR | 功能描述:DC/DC 开关控制器 Prog Dual-Phase Cont RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6919E | 功能描述:DC/DC 开关控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6919ETR | 功能描述:DC/DC 开关控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L-692 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:Common Mode Inductor |
| L6920 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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