Datasheet.kr   

MC3425 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 MC3425은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 MC3425 자료 제공

부품번호 MC3425 기능
기능 POWER SUPPLY SUPERVISORY/ OVER AND UNDERVOLTAGE PROTECTION CIRCUIT
제조업체 ON Semiconductor
로고 ON Semiconductor 로고


MC3425 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 12 페이지수

미리보기를 사용할 수 없습니다

MC3425 데이터시트, 핀배열, 회로
ON Semiconductort
Power Supply Supervisory/
Over and Undervoltage
Protection Circuit
The MC3425 is a power supply supervisory circuit containing all
the necessary functions required to monitor over and undervoltage
fault conditions. These integrated circuits contain dedicated over and
undervoltage sensing channels with independently programmable
time delays. The overvoltage channel has a high current Drive
Output for use in conjunction with an external SCR Crowbar for
shutdown. The undervoltage channel input comparator has hysteresis
which is externally programmable, and an open–collector output for
fault indication.
Dedicated Over and Undervoltage Sensing
Programmable Hysteresis of Undervoltage Comparator
Internal 2.5 V Reference
300 mA Overvoltage Drive Output
30 mA Undervoltage Indicator Output
Programmable Time Delays
4.5 V to 40 V Operation
MAXIMUM RATINGS
Rating
Power Supply Voltage
Comparator Input Voltage Range (Note 1)
Drive Output Short Circuit Current
Symbol
VCC
VIR
IOS(DRV)
Value
40
–0.3 to +40
Internally
Limited
Unit
Vdc
Vdc
mA
Indicator Output Voltage
VIND
0 to 40
Vdc
Indicator Output Sink Current
IIND 30 mA
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air
PD
RθJA
1000
80
mW
°C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature Range
TA
0 to +70
°C
Storage Temperature Range
Tstg –55 to +150 °C
NOTE: 1. The input signal voltage should not be allowed to go negative by more than 300 mV
NOTE: 1. or positive by more than 40 V, independent of VCC, without device destruction.
Simplified Application
Overvoltage Crowbar Protection, Undervoltage Indication
Vin Vout
MC3425
POWER SUPPLY SUPERVISORY/
OVER AND UNDERVOLTAGE
PROTECTION CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
8
1
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
O.V. DRV
Output
1
O.V. DLY 2
O.V. Sense 3
U.V. Sense 4
8 VCC
7 Gnd
6
U.V. IND
Output
5 U.V. DLY
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC3425P1 TA = 0° to +70°C
Plastic DIP
DC
Power
Supply
+
Cout
MC3425
Undervoltage
Indication
© Semiconductor Components Industries, LLC, 2001
April, 2001 – Rev. 3
1
Publication Order Number:
MC3425/D




MC3425 pdf, 반도체, 판매, 대치품
MC3425
5.0
4.0
VCC = 15 V
1.0% Duty Cycle @ 300 Hz
TA = 25°C
3.0
2.0
1.0
0.4
0.3
0.2
0.1
VCC = 15 V
TA = 25°C
0
0 100 200 300
IDRV(peak), DRIVE OUTPUT PEAK CURRENT (mA)
400
Figure 7. Drive Output Saturation Voltage
versus Output Peak Current
0
0 10 20 30
IIND, INDICATOR OUTPUT SINK CURRENT (mA)
40
Figure 8. Indicator Output Saturation Voltage
versus Output Sink Current
2.500
2.460
2.420
VCC = 15 V
IDRV(peak) = 200 mA
1.0% Duty Cycle @ 300 Hz
2.380
2.340
2.300
-55 -25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 9. Drive Output Saturation Voltage
versus Temperature
28
Curve O.V. Sense U.V. Sense
24 A
B
20
VCC
Gnd
Gnd
VCC
16
A
12
8.0 B
4.0 TA = 25°C
0
0 5.0 10 15 20 25 30 35
VCC, POWER SUPPLY VOLTAGE (V)
Figure 10. Power Supply Current
versus Voltage
40
http://onsemi.com
4

4페이지










MC3425 전자부품, 판매, 대치품
MC3425
CROWBAR SCR CONSIDERATIONS
Referring to Figure 16, it can be seen that the crowbar
SCR, when activated, is subject to a large current surge
from the output capacitance, Cout. This capacitance
consists of the power supply output capacitors, the load’s
decoupling capacitors, and in the case of Figure 16A, the
supply’s input filter capacitors. This surge current is
illustrated in Figure 17, and can cause SCR failure or
degradation by any one of three mechanisms: di/dt,
absolute peak surge, or I2t. The interrelationship of these
failure methods and the breadth of the applications make
specification of the SCR by the semiconductor
manufacturer difficult and expensive. Therefore, the
designer must empirically determine the SCR and circuit
elements which result in reliable and effective OVP
operation. However, an understanding of the factors which
influence the SCR’s di/dt and surge capabilities simplifies
this task.
1. di/dt
As the gate region of the SCR is driven on, its area of
conduction takes a finite amount of time to grow, starting
as a very small region and gradually spreading. Since the
anode current flows through this turned–on gate region,
very high current densities can occur in the gate region if
high anode currents appear quickly (di/dt). This can result
in immediate destruction of the SCR or gradual
degradation of its forward blocking voltage capabilities –
depending on the severity of the occasion.
The value of di/dt that an SCR can safely handle is
influenced by its construction and the characteristics of the
gate drive signal. A center–gate–fire SCR has more di/dt
capability than a corner–gate–fire type, and heavily
overdriving ( 3 to 5 times IGT) the SCR gate with a fast <
1.0 µs rise time signal will maximize its di/dt capability. A
typical maximum number in phase control SCRs of less
than 50 A(RMS) rating might be 200 A/µs, assuming a gate
current of five times IGT and < 1.0 µs rise time. If having
done this, a di/dt problem is seen to still exist, the designer
can also decrease the di/dt of the current waveform by
adding inductance in series with the SCR, as shown in
Figure 18. Of course, this reduces the circuit’s ability to
rapidly reduce the dc bus voltage and a tradeoff must be
made between speedy voltage reduction and di/dt.
(A) SCR Across Input of Regulator
Vin
Series
Regulator
Vout
MC3425
++
Cin Cout
(B) SCR Across Output of Regulator
Vin
Series
Regulator
*
++
Cin Cout MC3425
*Needed if supply is not current limited.
Figure 16. Typical Crowbar Circuit Configurations
Vout
http://onsemi.com
7

7페이지


구       성 총 12 페이지수
다운로드[ MC3425.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
MC3420

(MC3420 / MC3520) SWITCHMODE REGULATOR CONTROL CIRCUIT

Motorola Semiconductors
Motorola Semiconductors
MC34216

PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER

Motorola Semiconductors
Motorola Semiconductors

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵