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參數(shù)資料
| 型號： | L6711TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件頁數(shù)： | 30/50頁 |
| 文件大?。?/td> | 679K |
| 代理商： | L6711TR |
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Output voltage monitor and protections
L6711
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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
--------------
+
=
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| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
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| L6725TR | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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| L6712AD | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6712ADTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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