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BD3941T Datasheet(PDF) 7 Page - Rohm

No. de pieza BD3941T
Descripción Electrónicos  Power Management LSI Series for Automotive Body Control
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

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9) Applications or inspection processes with modes where the potentials of the Vcc pin and other pins may be reversed from their normal
states may cause damage to the IC's internal circuitry or elements.
Use an output pin capacitance of 1,000
µF or lower in case Vcc is shorted with the GND pin while the external capacitor is charged. It is
recommended to insert a diode for preventing back current flow in series with Vcc or bypass diodes between Vcc and each pin.
Fig. 23
10)
Thermal shutdown circuit (TSD)
This IC incorporates a built-in thermal shutdown circuit for the protection from thermal destruction. The IC should be used within the
specified power dissipation range. However, in the event that the IC continues to be operated in excess of its power dissipation limits, the
attendant rise in the chip’s temperature Tj will trigger the thermal shutdown circuit to turn off all output power elements. The circuit will
automatically reset once the chip’s temperature Tj drops. Operation of the thermal shutdown circuit presumes that the IC’s absolute
maximum ratings have been exceeded. Application designs should never make use of the thermal shutdown circuit. (See Fig.8)
11)
Overcurrent protection circuit (OCP)
The IC incorporates a built-in overcurrent protection circuit that operates according to the output current capacity. This circuit serves to
protect the IC from damage when the load is shorted. The protection circuit is designed to limit current flow by not latching in the event of
a large and instantaneous current flow originating from a large capacitor or other component. However, while this protection circuit is
effective in preventing damage due to sudden and unexpected accidents, it is not compatible with continuous operation or use during
transitional periods. At the time of thermal designing, keep in mind that the current capability has negative characteristics to temperatures.
(See Fig. 3.)
12) Overvoltage protection circuit (OVP)
Overvoltage protection is designed to turn off all output when the voltage differential between the VCC and GND pins exceeds
approximately 30 V (typ.). Use caution when determining the power supply voltage range to use. (See Fig. 6)
Selecting a model name when ordering
ROHM model
name
Part number
3940: 3.3 V output
3941: 5.0 V output
Packaging type
FP : TO252-3
HFP : HRP5
T : TO220FP-3
Taping
E2 : Reel-wound embossed taping
B D
1
9
3
4
P
F
E 2
<Tape and Reel information>
Embossed carrier tape
E2
(The direction is the 1pin of product is at the lower left when you hold
reel on the left hand and you pull out the tape on the right hand)
Tape
Quantity
Direction
of feed
2000pcs
Reel
1pin
x x x x
x x x x
x x x x
x x x x
x x x x
x x x x
TO252-3
<Dimension>
(Unit:mm)
6.5
±0.2
C0.5
2
13
0.65
0.65
2.3
±0.2 2.3±0.2
0.5
±0.1
2.3
±0.2
0.5
±0.1
5.1
+0.2
−0.1
0.75
1.0
±0.2
FIN
When you order , please order in times the amount of package quantity.
Direction of feed
Vcc
Bypass diode
Diode for preventing back current flow
Pin


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