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MC7908 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer MC7908
Beschreibung (MC7900 Series) 1.0 A Negative Voltage Regulators
Hersteller ON Semiconductor
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Gesamt 16 Seiten
MC7908 Datasheet, Funktion
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MC7900 Series
1.0 A Negative Voltage
Regulators
The MC7900 series of fixed output negative voltage regulators are
intended as complements to the popular MC7800 series devices.
These negative regulators are available in the same seven−voltage
options as the MC7800 devices. In addition, one extra voltage option
commonly employed in MECL systems is also available in the
negative MC7900 series.
Available in fixed output voltage options from − 5.0 V to − 24 V,
these regulators employ current limiting, thermal shutdown, and
safe−area compensation − making them remarkably rugged under
most operating conditions. With adequate heatsinking they can deliver
output currents in excess of 1.0 A.
No External Components Required
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Available in 2% Voltage Tolerance (See Ordering Information)
Pb−Free Package May be Available. The G−Suffix Denotes a
Pb−Free Lead Finish
2.0 k 8.0 k
Gnd
3.6 k 1.0 k 4.0 k R1
1.2 k 1.6 k
R2
10 k
20 pF
10 pF 10 k
2.0 k 20 k 20 k
1.1 k
240
750
This device contains 26 active transistors.
VO
0.3
VI
Figure 1. Representative Schematic Diagram
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TO−220
T SUFFIX
CASE 221AB
Heatsink surface
connected to Pin 2.
1
2
3
Pin 1. Ground
2. Input
3. Output
D2PAK
D2T SUFFIX
CASE 936
12
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
Input
Cin*
0.33 mF
MC79XX
Output
CO**
1.0 mF
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above more negative even
during the high point of the input ripple voltage.
XX, These two digits of the type number
indicate nominal voltage.
** Cin is required if regulator is located an
appreciable distance from power supply filter.
** CO improve stability and transient response.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 14
1
Publication Order Number:
MC7900/D






MC7908 Datasheet, Funktion
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MC7900 Series
MC7915B, MC7915C
ELECTRICAL CHARACTERISTICS (VI = − 23 V, IO = 500 mA, Tlow* < TJ < +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (TJ = +25°C)
Line Regulation (Note 5)
(TJ = +25°C, IO = 100 mA)
−17.5 Vdc VI − 30 Vdc
−20 Vdc VI − 26 Vdc
(TJ = +25°C, IO = 500 mA)
−17.5 Vdc VI − 30 Vdc
−20 Vdc VI − 26 Vdc
Load Regulation, TJ = +25°C (Note 5)
5.0 mA IO 1.5 A
250 mA IO 750 mA
VO −14.4 −15 −15.6 Vdc
Regline
mV
− 14 150
− 6.0 75
Regload
57 300
27 150
mV
68 300
25 150
Output Voltage
−17.5 Vdc VI − 30 Vdc, 5.0 mA IO 1.0 A, P 15 W
VO Vdc
−14.25 − −15.75
Input Bias Current (TJ = +25°C)
Input Bias Current Change
−17.5 Vdc VI − 30 Vdc
5.0 mA IO 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz f 100 kHz)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, Tlow* TJ +125°C
IIB − 4.4 8.0 mA
DIIB mA
− − 1.0
− − 0.5
Vn − 90 − mV
RR − 60 − dB
VI−VO − 1.3 − Vdc
DVO/DT
mV/°C
− −1.0 −
MC7915AC
ELECTRICAL CHARACTERISTICS (VI = − 23 V, IO = 500 mA, Tlow* < TJ < +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (TJ = +25°C)
Line Regulation (Note 5)
−20 Vdc VI − 26 Vdc, IO = 1.0 A, TJ = +25°C
−20 Vdc VI − 26 Vdc, IO = 1.0 A,
−17.9 Vdc VI − 30 Vdc, IO = 500 mA
−17.5 Vdc VI − 30 Vdc, IO = 1.0 A, TJ = +25°C
VO −14.7 −15 −15.3 Vdc
Regline
mV
− 27 75
− 57 150
− 57 150
− 57 150
Load Regulation (Note 5)
5.0 mA IO 1.5 A, TJ = +25°C
250 mA IO 750 mA
5.0 mA IO 1.0 A
Output Voltage
−17.9 Vdc VI − 30 Vdc, 5.0 mA IO 1.0 A, P 15 W
Regload
mV
68 150
25 75
40 150
VO Vdc
−14.4 − −15.6
Input Bias Current
IIB − 4.4 8.0 mA
Input Bias Current Change
−17.5 Vdc VI − 30 Vdc
5.0 mA IO 1.0 A
5.0 mA IO 1.5 A, TJ = +25°C
DIIB mA
− − 0.8
− − 0.5
− − 0.5
Output Noise Voltage (TA = +25°C, 10 Hz f 100 kHz)
Vn − 90 − mV
Ripple Rejection (IO = 20 mA, f = 120 Hz)
RR − 60 − dB
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
VI−VO − 1.3 − Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, Tlow* TJ +125°C
DVO/DT
mV/°C
− −1.0 −
5. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
*Tlow = −40°C for MC7915B and Tlow = 0°C for MC7915C.
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MC7908 pdf, datenblatt
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Device
MC7912ACD2T
MC7912ACD2TG
MC7912ACD2TR4
MC7912ACD2TR4G
MC7912ACT
MC7912ACTG
MC7912BD2T
MC7912BD2TG
MC7912BD2TR4
MC7912BD2TR4G
MC7912BT
MC7912BTG
MC7912CD2T
MC7912CD2TG
MC7912CD2TR4
MC7912CD2TR4G
MC7912CT
MC7912CTG
MC7915ACD2T
MC7915ACD2TG
MC7915ACT
MC7915ACTG
MC7915BD2T
MC7915BD2TG
MC7915BT
MC7915BTG
MC7915CD2T
MC7915CD2TG
MC7915CD2TR4
MC7915CD2TR4G
MC7915CT
MC7915CTG
MC7900 Series
Nominal
Output Voltage
−12 V
Output Voltage
Tolerance
2%
4%
− 15 V
2%
4%
Package
D2PAK
D2PAK
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
D2PAK
D2PAK
(Pb−Free)
TO−220
TO−220
(Pb−Free)
Operating
Temperature Range
TJ = 0°C to +125°C
TJ = −40°C to +125°C
TJ = 0°C to +125°C
TJ = 0°C to +125°C
TJ = −40°C to +125°C
TJ = 0°C to +125°C
Shipping
50 Units/Rail
50 Units/Rail
800 Tape & Reel
800 Tape & Reel
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
800 Tape & Reel
800 Tape & Reel
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
800 Tape & Reel
800 Tape & Reel
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
50 Units/Rail
800 Tape & Reel
800 Tape & Reel
50 Units/Rail
50 Units/Rail
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