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参数资料
| 型号： | L6711TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 28/50页 |
| 文件大小： | 679K |
| 代理商： | L6711TR |
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Output voltage monitor and protections
L6711
34/50
Figure 16.
Output voltage protections and typical principle connections to assure
complete protection.
14.4
Over current
Depending on the current reading method selected, the device limits the peak or the bottom
of the inductor current entering in constant current until setting UVP as below explained.
The Over Current threshold has to be programmed, by designing the Rg resistors, to a safe
value, in order to be sure that the device doesn't enter OCP during normal operation of the
device. This value must take into consideration also the extra current needed during the
Dynamic VID Transition ID-VID and, since the device reads across mosfets RdsON or inductor
DCR, the process spread and temperature variations of these sensing elements.
Moreover, since also the internal threshold spreads, the Rg design must consider its
minimum value IOCTH(min) as follow:
where IOCPx is the current measured by the current reading circuitry when the device enters
Quasi Constant Current (LS Mosfet Sense) or Constant Current (Inductor Sense), IOCPx
must be calculated starting from the corresponding output current value IOUT(OCP) as follow
(ID-VID must also be considered when D-VID are implemented):
where IOUT(OCP) is still the output current value at which the device enters Quasi Constant
Current (LS Mosfet Sense) or Constant Current (Inductor Sense),
IPP is the inductor current
ripple in each phase and ID-VID is the additional current required by D-VID (when applicable).
In particular, since the device limits the peak or the valley of the inductor current (according
to CS_SEL status), the ripple entity, when not negligible, impacts on the real OC threshold
value and must be considered.
Vcc
PreOVP TurnON
Vcc TurnON
Preliminary OVP Enabled
FBR Monitored
No Protection
Provided
(OUTEN = 1)
Programmable OVP
VSEN Monitored
(OUTEN = 0)
Preliminary OVP
FBR Monitored
VCC
VCCDR1
VCCDR2
VCCDR3
+12V
+5V
SB
Rg
I
OCPx max
() RSENSE max
()
I
OC TH min
()
---------------------------------------------------------------------
=
I
OCPx =
I
OUT OCP
()
3
---------------------------
I
pp
2
-----------
I
D-VID
3
-------------- Low Side Mosfet Sense
+
–
I
OUT OCP
()
3
---------------------------
I
pp
2
-----------
I
D-VID
3
-------------- Inductor DCR Sense
++
相关PDF资料 |
PDF描述 |
|---|---|
| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
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相关代理商/技术参数 |
参数描述 |
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| L6712 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712AD | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712ADTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
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