參數(shù)資料
型號(hào): LT3641EUFD#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28
封裝: 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù): 10/28頁(yè)
文件大?。?/td> 416K
代理商: LT3641EUFD#TRPBF
LT3641
18
3641f
Reverse Protection
In battery charging applications or in battery back-up
systems, the output will be held high when the input to the
LT3641 is absent. If the VIN pin is oated and the LT3641
is enabled, the LT3641’s internal circuitry will pull its qui-
escent current through the SW1 pin or the SW2 pin. This
is ne if the system can tolerate a few mA in this state.
If the LT3641 is disabled, the SW1 pin and the SW2 pin
current will drop to essentially zero. However, if the VIN
pin is grounded while the high voltage channel output is
held high, an external diode is required at the VIN pin to
prevent current being pulled out of the VIN pin. If the VIN2
pin is grounded while the low voltage channel output is
held high, an external diode is required at the VIN2 pin to
prevent current being pulled out of the VIN2 pin (Figure 6).
PFM Operation
Toimproveefciencyatlightloads,theLT3641automatically
switches to pulse frequency modulation (PFM) operation
which minimizes the switching loss and keeps the output
voltage ripples small.
Because the two channels of the LT3641 may have differ-
ent loads, the two channels can have different switching
frequency (Figure 7).
Figure 6. Diodes Prevent Shorted Inputs from
Discharging a Battery Tied to the Outputs
APPLICATIONS INFORMATION
3641 F07
OUT2
OUT1
GND
FB2
SW2
SW1
EN/UVLO
VIN
IN
SW
LT3641
BST
VIN2
FB1
DA
+
+
IN2
Figure 4. The High Voltage Channel Reduces Frequency
to Protect Against Shorted Output with 55V Input
Figure 5. The Low Voltage Channel Operates in Valley
Current Limit Mode to Protect Against Shorted Output
1μs/DIV
SW1
20V/DIV
IL1
1A/DIV
3641 F05
VIN = 55V
VOUT1 = SHORT
1μs/DIV
SW2
2V/DIV
SW1
20V/DIV
IL2
1A/DIV
3641 F06
VIN2 = 5V
VOUT2 = SHORT
相關(guān)PDF資料
PDF描述
LT3641IUFD#PBF 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28
LT3653EDCB#TRPBF 1.2 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PDSO8
LT3684IMSE 4 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO10
LT3684EDD#TR 4 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO10
LT3694-1EUFD#PBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28
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