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參數資料
| 型號： | L6701TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SSO-36 |
| 文件頁數： | 26/44頁 |
| 文件大?。?/td> | 627K |
| 代理商： | L6701TR |
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13 Output voltage Monitor and Protections
L6701
32/44
inductor current, the ripple entity, when not negligible, impacts on the real OC threshold value
and must be considered.
The device detects an Over Current condition for each phase when the current information
IISENx overcomes the fixed threshold of IOCTH. When this happens, the device keeps the
relative LS MOSFET on, also skipping clock cycles, until the threshold is crossed back and
IISENx results being lower than the IOCTH threshold (this implies that the device limits the bottom
of each inductor current ripple). After exiting the OC condition, the LS MOSFET is turned off
and the HS is turned on with a duty cycle driven by the PWM comparator.
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 (see Section 10.5). When this happens, the device
works in Real 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.
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 EN pin to restart operation.
The maximum average current during the Constant-Current behavior results (see Figure 15):
in this particular situation, the switching frequency for each phase results reduced. The ON time
is the maximum allowed TON(max) while the OFF time depends on the application:
Figure 15. Constant Current Operation
I
PEAK
I
OC Px
V
IN
V
OU T m in
()
–
L
------------------------------------------- TON max
()
+
I
OCPx
V
IN
V
OUT min
()
–
L
------------------------------------------- 0.40 T
SW
+
==
I
MAX tot
,
3I
MAX
3I
OC Px
I
PEAK
I
OCPx
–
2
-------------------------------------
+
==
T
OFF
L
I
PEAK
I
OC Px
–
V
OU T
-------------------------------------
=
f
1
T
ON max
()
T
OFF
+
----------------------------------------------
=
VOUT
0.40 VIN
Constant Current (Exploded)
IOCP = N x IOCPx
(IDROOP = N x 35A)
IOUT
UVP Threshold
Resulting Out. Char.
IMAX,tot
Limted-TON Char.
Droop Effect
Quasi-Const.
Current
TON(max)
IOCPx
IMAX
IPEAK
LS ON Skipping
Clock Cycles
TSW
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