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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： | 30/50页 |
| 文件大小： | 679K |
| 代理商： | L6711TR |
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Output voltage monitor and protections
L6711
36/50
14.5.2
Constant current operation
This happens when the on-time limitation is reached after the valley current in each phase
reaches IOCPx (IINFOx > IOCTH).
The device enters in Quasi-Constant-Current operation: the low-side mosfets stays ON until
the current read becomes lower than IOCPx (IINFOx < IOCTH) skipping clock cycles. The high
side mosfet can be then turned ON with a TON imposed by the control loop after the LS turn-
off and the device works in the usual way until another OCP event is detected.
This means that the average current delivered can slightly increase in Quasi-Constant-
Current operation since the current ripple increases. In fact, the ON time increases due to
the OFF time rise because of the current has to reach the IOCPx bottom. The worst-case
condition is when the ON time reaches its maximum value.
When this happens, the device works in Constant Current and the output voltage decrease
as the load increase. Crossing the UVP threshold causes the device to latch driving high the
OSC pin (Figure 18 shows this working condition).
It can be observed that the peak current (Ipeak) is greater than IOCPx but it can be
determined as follow:
Where VoutMIN is the UVP threshold, (inductor saturation must be considered). When that
threshold is crossed, all mosfets are turned off, the FAULT pin is driven high and the device
stops working. Cycle the power supply or the OUTEN pin to restart operation.
The maximum average current during the Constant-Current behavior results:
In this particular situation, the switching frequency for each phase results reduced. The ON
time is the maximum allowed (TonMAX) while the OFF time depends on the application:
The transconductance resistor Rg can be designed considering that the device limits the
bottom of the inductor current ripple and also considering the additional current delivered
during the quasi-constant-current behavior as previously described in the worst case
conditions.
Moreover, when designing D-VID compatible systems, the additional current due to the
output filter charge during dynamic VID transitions must be considered.
where
I
PEAK
I
OC Px
V
IN
Vout
MI N
–
L
-------------------------------------- TonMAX
+
I
OCPx
V
IN
Vout
MIN
–
L
-------------------------------------- 0.40 TSW
+
==
I
MAX,TOT
3I
MAX
3I
OCPx
Ipeak
I
OCPx
–
2
-------------------------------------
+
==
T
OFF
L
Ipeak
I
OCPx
–
V
ou t
-------------------------------------
=
F
1
T
on Ma x
T
OFF
+
---------------------------------------
=
Rg
I
OCPx max
() RSENSE max
()
I
OC TH min
()
---------------------------------------------------------------------
=
I
OCPx
I
OUT OCP
()
3
---------------------------
I
PP
2
------------
–
I
D-VID
3
--------------
+
=
相关PDF资料 |
PDF描述 |
|---|---|
| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| L6714TR | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
| L6714 | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
| L6725TR | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6728ATR | SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
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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 |
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| 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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