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參數(shù)資料
| 型號： | L6919ETR |
| 廠商： | 意法半導體 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| 中文描述： | 5位可編程雙相與動態(tài)VID管理控制器 |
| 文件頁數(shù)： | 12/33頁 |
| 文件大小： | 606K |
| 代理商： | L6919ETR |
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L6919E
12/33
1. T
ON
Limited Output Voltage.
This happens when the maximum ON time is reached before the current in each phase reaches I
OCPx
(I
INFOx
< 35
μ
A).
Figure 5a shows the maximum output voltage that the device is able to regulate considering the T
ON
limitation
imposed by the previous relationship. If the desired output characteristic crosses the T
ON
limited maximum output
voltage, the output resulting voltage will start to drop after crossing. In this case, the device doesn't perform con-
stant current limitation but only limits the maximum ON time following the previous relationship. The output volt-
age follows the resulting characteristic (dotted in Figure 5b) until UVP is detected or anyway until I
FB
= 70
μ
A.
Figure 5. T
ON
Limited Operation
2. Constant Current Operation
This happens when ON time limitation is reached after the current in each phase reaches I
OCPx
(I
INFOx
>35
μ
A).
The device enters in Quasi-Constant-Current operation: the low-side mosfets stays ON until the current read
becomes lower than I
OCPx
(I
INFOx
< 35
μ
A) skipping clock cycles. The high side mosfets can be turned ON with
a T
ON
imposed by the control loop at the next available clock cycle and the device works in the usual way until
another OCP event is detected.
This means that the average current delivered can slightly increase also in Over Current condition since the cur-
rent ripple increases. In fact, the ON time increases due to the OFF time rise because of the current has to reach
the I
OCPx
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 (FAULT pin is driven high).
Figure 6 shows this working condition
It can be observed that the peak current (Ipeak) is greater than the I
OCPx
but it can be determined as follow:
V
Vout
–
L
Where V
outMIN
is the minimum output voltage (VID-30% as follow).
The device works in Constant-Current, and the output voltage decreases as the load increase, until the output
voltage reaches the Under-Voltage threshold (V
outMIN
). When this threshold is crossed, all mosfets are turned
off, the FAULT pin is driven high and the device stops working. Cycle the power supply to restart operation. The
maximum average current during the Constant-Current behavior results:
a) Maximum output Voltage
b) T
ON
Limited Output Voltage
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
T
ON
Limited Output
characteristic
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
Desired Output
characteristic and
UVP threshold
Resulting Output
characteristic
Ipeak
I
OCPx
--------------------------------------
Ton
MAX
+
I
OCPx
V
-----------–
0.40 T
Vout
L
+
=
=
I
MAX,TOT
2 I
MAX
2
I
OCPx
Ipeak
-------------------------------------
I
–
2
+
+
=
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