データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

MC78M20ACT データシート(PDF) 9 Page - Motorola, Inc

部品番号 MC78M20ACT
部品情報  THREE-TERMINAL MEDIUM CURRENT POSITIVE FIXED VOLTAGE REGULATORS
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  MOTOROLA [Motorola, Inc]
ホームページ  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC78M20ACT データシート(HTML) 9 Page - Motorola, Inc

Back Button MC78M20ACT Datasheet HTML 4Page - Motorola, Inc MC78M20ACT Datasheet HTML 5Page - Motorola, Inc MC78M20ACT Datasheet HTML 6Page - Motorola, Inc MC78M20ACT Datasheet HTML 7Page - Motorola, Inc MC78M20ACT Datasheet HTML 8Page - Motorola, Inc MC78M20ACT Datasheet HTML 9Page - Motorola, Inc MC78M20ACT Datasheet HTML 10Page - Motorola, Inc MC78M20ACT Datasheet HTML 11Page - Motorola, Inc MC78M20ACT Datasheet HTML 12Page - Motorola, Inc  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
MC78M00 MC78M00A Series
9
MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
Design Considerations
The MC78M00/MC78M00A Series of fixed voltage
regulators are designed with Thermal Overload Protection
that shuts down the circuit when subjected to an excessive
power overload condition, Internal Short Circuit Protection
that limits the maximum current the circuit will pass, and
Output Transistor Safe–Area Compensation that reduces the
output short circuit current as the voltage across the pass
transistor is increased.
In many low current applications, compensation
capacitors are not required. However, it is recommended that
the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long wire
lengths, or if the output load capacitance is large. An input
bypass capacitor should be selected to provide good high
frequency characteristics to insure stable operation under all
load conditions. A 0.33
µF or larger tantalum, mylar, or other
capacitor having low internal impedance at high frequencies
should be chosen. The bypass capacitor should be mounted
with the shortest possible leads directly across the
regulator’s input terminals. Normally good construction
techniques should be used to minimize ground loops and
lead resistance drops since the regulator has no external
sense lead.
Figure 9. Current Regulator
Figure 10. Adjustable Output Regulator
Figure 11. Current Boost Regulator
Figure 12. Current Boost with
Short Circuit Protection
The MC78M00 regulators can also be used as a current source
when connected as above. In order to minimize dissipation the
MC78M05C is chosen in this application. Resistor R determines
the current as follows:
For example, a 500 mA current source would require R to be a
5.0
Ω, 10 W resistor and the output voltage compliance would
be the input voltage less 7.0 V.
IO =
5.0 V
R
+ IIB
IIB = 1.5 mA over line and load changes.
Input
0.33
µF
R
IO
MC78M05C
Constant
Current to
Grounded
Load
The addition of an operational amplifier allows adjustment to higher
or intermediate values while retaining regulation characteristics.
The minimum voltage obtainable with this arrangement is 2.0 V
greater than the regulator voltage.
Input
MC78M05C
Output
0.33
µF
10 k
MC1741
7
6
4
1.0 k
0.1
µF
3
2
The MC78M00 series can be current boosted with a PNP
transistor. The MJ2955 provides current to 5.0 A. Resistor R in
conjunction with the VBE of the PNP determines when the pass
transistor begins conducting; this circuit is not short circuit
proof. Input–output differential voltage minimum is increased
by VBE of the pass transistor.
XX = 2 digits of type number indicating voltage.
MC78MXXC
Input
Output
R
1.0
µF
MJ2955 or Equiv.
1.0
µF
The circuit of Figure NO TAG can be modified to provide supply
protection against short circuits by adding a short circuit sense
resistor, Rsc, and an additional PNP transistor. The current sensing
PNP must be able to handle the short circuit current of the
three–terminal regulator .Therefore, a 4.0 A plastic power transistor
is specified.
XX = 2 digits of type number indicating voltage.
1.0
µF
MC78MXXC
MJ2955
or Equiv.
Input
Output
RSC
R
2N6049
or Equiv.
VO, 7.0 V to 20 V
Vin–Vout ≥ 2.0 V
*
+


同様の部品番号 - MC78M20ACT

メーカー部品番号データシート部品情報
logo
ON Semiconductor
MC78M20 ONSEMI-MC78M20 Datasheet
309Kb / 14P
   500 mA Positive Voltage Regulators
November, 2021 - Rev. 29
MC78M20B ONSEMI-MC78M20B Datasheet
309Kb / 14P
   500 mA Positive Voltage Regulators
November, 2021 - Rev. 29
MC78M20BT ONSEMI-MC78M20BT Datasheet
153Kb / 16P
   500 mA Positive Voltage Regulators
November, 2005 ??Rev. 16
MC78M20C ONSEMI-MC78M20C Datasheet
309Kb / 14P
   500 mA Positive Voltage Regulators
November, 2021 - Rev. 29
MC78M20CT ONSEMI-MC78M20CT Datasheet
153Kb / 16P
   500 mA Positive Voltage Regulators
November, 2005 ??Rev. 16
More results

同様の説明 - MC78M20ACT

メーカー部品番号データシート部品情報
logo
Cystech Electonics Corp...
PL78M05XJ3 CYSTEKEC-PL78M05XJ3 Datasheet
152Kb / 4P
   Three Terminal Medium Current Positive Voltage Regulators
PL78M05XA3 CYSTEKEC-PL78M05XA3 Datasheet
154Kb / 4P
   Three Terminal Medium Current Positive Voltage Regulators
PL78M05XT3 CYSTEKEC-PL78M05XT3 Datasheet
155Kb / 4P
   Three Terminal Medium Current Positive Voltage Regulators
LM78M05J3 CYSTEKEC-LM78M05J3 Datasheet
466Kb / 12P
   Three Terminal Medium Current Positive Voltage Regulators
LM78MXXJ3 CYSTEKEC-LM78MXXJ3 Datasheet
466Kb / 12P
   Three Terminal Medium Current Positive Voltage Regulators
LM78M05L3 CYSTEKEC-LM78M05L3 Datasheet
255Kb / 6P
   Three Terminal Medium Current Positive Voltage Regulators
LM78M05XA3 CYSTEKEC-LM78M05XA3 Datasheet
169Kb / 4P
   Three Terminal Medium Current Positive Voltage Regulators
logo
Motorola, Inc
MC7800 MOTOROLA-MC7800 Datasheet
278Kb / 16P
   THREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340 MOTOROLA-LM340 Datasheet
205Kb / 20P
   THREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
MCT7800 MOTOROLA-MCT7800 Datasheet
224Kb / 12P
   THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com