Datasheet 78mxx Datasheet

Page 1

MC78M00, MC78M00A Series

Three-Terminal Medium Current Positive V oltage Regulators

The MC78M00/MC78M00A Series positive voltage regulators are identical to the popular MC7800 Series devices, except that they are specified for only half the output current. Like the MC7800 devices, the MC78M00 three–terminal regulators are intended for local, on–card voltage regulation.

Internal current limiting, thermal shutdown circuitry and safe–area compensation for the internal pass transistor combine to make these devices remarkably rugged under most operating conditions. Maximum output current, with adequate heatsinking is 500 mA.

• No External Components Required

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output T ransistor Safe–Area Compensation

• MC78M00A High Accuracy (±2%) Available for 5.0 V, 8.0 V, 12 V

and 15 V

Representative Schematic Diagram

1.0 k 1.0 k

300

3.6 k

6.4 k

520

2.0 k 3.9 k

2.6 k

6.0 k

5.6 k

3.0 k

40 pF

1.0 k

210

6.7 16 k

100

200

300

10 pF

20050

Input

0.24

Output

http://onsemi.com

MARKING

DIAGRAMS

TO–220

T SUFFIX

CASE 221A

Heatsink surface

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

connected to Pin 2.

DPAK DT SUFFIX CASE 369A

Pin 1. Input

2. Ground

3. Output

xx = Voltage Option Z = A, B, or C Option A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W= Work Week

78MxxZT

ALYWW

8MxxZ

ALYWW

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.

6.0 k

This device contains 28 active transistors.

 Semiconductor Components Industries, LLC, 2000

April, 2000 – Rev. 7

2.8 k Gnd

1 Publication Order Number:

MC78M00/D

Page 2

MC78M00, MC78M00A Series

MAXIMUM RATINGS (T

Input Voltage (5.0 V–18 V) V

(20 V–24V) 40

Power Dissipation (Package Limitation)

Plastic Package, T Suffix

TA = 25°C P

Thermal Resistance, Junction–to–Air θ Thermal Resistance, Junction–to–Case θ

Plastic Package, DT Suffix

TA = 25°C P

Thermal Resistance, Junction–to–Air θ

Thermal Resistance, Junction–to–Case θ Operating Junction Temperature Range T Storage Temperature Range T

NOTE: ESD data available upon request.

MC78M05C/AC/B ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Output Voltage (TJ = 25°C) V

MC78M05C 4.8 5.0 5.2

MC78M05AC 4.9 5.0 5.1 Output Voltage Variation V

(7.0 Vdc ≤ VI ≤ 20 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M05C 4.75 – 5.25

MC78M05AC 4.80 – 5.20 Line Regulation Reg

(TJ = 25°C, 7.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)

Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 20 100

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 10 50 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 8.0 V ≤ VI ≤ 18 V) 62 – –

(IO = 300 mA, f = 120 Hz, 8.0 ≤ VI ≤ 18 V, TJ = 25°C) 62 80 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 25°C, unless otherwise noted.)

Rating

Characteristics

Symbol Value Unit

JA JC

stg

= 10 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W,

Symbol Min Typ Max Unit

line

load

35 Vdc

Internally Limited

70 °C/W

5.0 °C/W

Internally Limited

92 °C/W

5.0 °C/W

+150 °C

–65 to +150 °C

– 3.0 5.0 mV

– 3.2 6.0 mA

– 40 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

http://onsemi.com

Page 3

MC78M00, MC78M00A Series

MC78M06C ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = 25°C) V Output Voltage Variation V

(8.0 Vdc ≤ VI ≤ 21 Vdc, 5.0 mA ≤ IO ≤ 350 mA) Line Regulation Reg

(TJ = 25°C, 8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 20 120

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 60 Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(9.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 9.0 V ≤ VI ≤ 19 V) 59 – –

(IO = 300 mA, f = 120 Hz, 9.0 V ≤ VI ≤ 19 V, TJ = 25°C) 59 80 – Dropout Voltage VI – V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 11 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

line

load

5.75 6.0 6.25 Vdc

5.7 – 6.3 Vdc

– 5.0 50 mV

– 3.2 6.0 mA

– 45 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

MC78M08C/AC/B ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics

Output Voltage (TJ = 25°C) V

MC78M08C 7.70 8.0 8.30

MC78M08AC 7.84 8.0 8.16 Output Voltage Variation V

(10.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M08C 7.6 – 8.4 MC78M08AC 7.7 – 8.3

Line Regulation Reg

(TJ = 25°C, 10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 160

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 80 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V) 56 – –

(IO = 300 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V, TJ = 25°C) 56 80 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 14 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W,

Symbol Min Typ Max Unit

line

load

– 6.0 50 mV

– 3.2 6.0 mA

– 52 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

http://onsemi.com

Page 4

MC78M00, MC78M00A Series

MC78M09C/B ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = 25°C) V Output Voltage Variation V

(11.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA) Line Regulation Reg

(TJ = 25°C, 11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 180

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 90 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V) 56 – –

(IO = 300 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V, TJ = 25°C) 56 80 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

MC78M12C/AC/B ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics

Output Voltage (TJ = 25°C) V

MC78M12C 11.50 12 12.50

MC78M12AC 11.76 12 12.24 Output Voltage Variation V

(14.5 Vdc ≤ VI ≤ 27 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M12C 11.4 – 12.6 MC78M12AC 11.5 – 12.5

Line Regulation Reg

(TJ = 25°C, 14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 240

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 120 Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V

Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V) 55 – –

(IO = 300 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V, TJ = 25°C) 55 80 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 15 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

line

load

= 19 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W,

Symbol Min Typ Max Unit

line

load

8.64 9.0 9.45 Vdc

8.55 – 9.45 Vdc

– 6.0 50 mV

– 3.2 6.0 mA

– 52 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

– 8.0 50 mV

– 3.2 6.0 mA

– 75 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

http://onsemi.com

Page 5

MC78M00, MC78M00A Series

MC78M15C/AC/B ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V

MC78M15C 14.4 15 15.6

MC78M15AC 14.7 15 15.3 Output Voltage Variation V

(17.5 Vdc ≤ VI ≤ 30 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M15C 14.25 – 15.75 MC78M15AC 14.40 – 15.60

Input Regulation Reg

(TJ = 25°C, 17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 300

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 150 Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V

Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V) 54 – –

(IO = 300 mA, f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V, TJ = 25°C) 54 70 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 23 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W,

line

load

– 10 50 mV

– 3.2 6.0 mA

– 90 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

MC78M18C ELECTRICAL CHARACTERISTICS (V

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V Output Voltage Variation V

(21 Vdc ≤ VI ≤ 33 Vdc, 5.0 mA ≤ IO ≤ 350 mA) Line Regulation Reg

(TJ = 25°C, 21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 360

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 180 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 22 V ≤ VI ≤ 32 V) 53 – –

(IO = 300 mA, f = 120 Hz, 22 V ≤ VI ≤ 32 V, TJ = 25°C) 53 70 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 27 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

O O

line

load

17.3 18 18.7 Vdc

17.1 – 18.9 Vdc

– 10 50 mV

– 3.2 6.5 mA

– 100 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

http://onsemi.com

Page 6

MC78M00, MC78M00A Series

MC78M20C ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = 25°C) V Output Voltage Variation V

(23 Vdc ≤ VI ≤ 35 Vdc, 5.0 mA ≤ IO ≤ 350 mA) Line Regulation Reg

(TJ = 25°C, 23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA) Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 400

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 200 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 24 V ≤ VI ≤ 34 V) 52 – –

(IO = 300 mA, f = 120 Hz, 24 V ≤ VI ≤ 34 V, TJ = 25°C) 52 70 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 29 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

line

load

19.2 20 20.8 Vdc 19 – 21 Vdc

– 10 50 mV

– 3.2 6.5 mA

– 110 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

MC78M24C ELECTRICAL CHARACTERISTICS (V

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V Output Voltage Variation V

(27 Vdc ≤ VI ≤ 38 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

Line Regulation Reg

(TJ = 25°C, 27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA)

Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 480

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 240 Input Bias Current (TJ = 25°C) I Quiescent Current Change ∆I

(27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5 Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 28 V ≤ VI ≤ 38 V) 50 – –

(IO = 300 mA, f = 120 Hz, 28 V ≤ VI ≤ 38 V, TJ = 25°C) 50 70 – Dropout Voltage VI–V

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C) I Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA) Peak Output Current I

(TJ = 25°C)

= 33 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

O O

line

load

23 24 25 Vdc

22.8 – 25.2 Vdc

– 10 50 mV

– 3.2 7.0 mA

– 170 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

http://onsemi.com

Page 7

MC78M00, MC78M00A Series

DEFINITIONS

Line Regulation – The change in output voltage for a

change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected.

Load Regulation – The change in output voltage for a

change in load current at constant chip temperature.

Maximum Power Dissipation – The maximum total

device dissipation for which the regulator will operate within specifications.

100

Free Air Mounted Vertically

Minimum Size Pad

0 10203025155.0

L, LENGTH OF COPPER (mm)

JAθ

R , THERMAL RESIST ANCE

JUNCTION–TO–AIR ( C/W)°

Input Bias Current – That part of the input current that

is not delivered to the load.

Output Noise Voltage – The rms AC voltage at the

output, with constant load and no input ripple, measured over a specified frequency range.

Long Term Stability – Output voltage stability under

accelerated life test conditions with the maximum rated voltage listed in the devices’ electrical characteristics and maximum power dissipation.

D(max)

θJA

for TA = 50°C

2.0 oz. Copper L

2.4

2.0

1.6

1.2

0.8

0.4

, MAXIMUM POWER DISSIPATION (W)

Figure 1. DP AK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

5.0

3.0

2.0

1.0

0.5

, POWER DISSIPATION (W)

0.3

0.2

0.1 25 50 75 100 125 150

θHS = 20°C/W

θJC = 5°C/W

= 7.52 W

D(max)

TA, AMBIENT TEMPERATURE (°C)

θHS = 10°C/W

No Heat Sink

Infinite Heat Sink

Figure 2. Worst Case Power Dissipation

versus Ambient T emperature (TO–220)

http://onsemi.com

Page 8

2.5

1.0

MC78M00, MC78M00A Series

0.9

0.8

0.7

0.6

0.5

0.4

0.3

, OUTPUT CURRENT (A)

0.2

0.1 0

0 5.0 10 15 20 25 30 35 40

TJ = 125°C

TJ = 25°C

VI – VO, DROPOUT VOLTAGE (V)

2.0

1.5

1.0

, DROPOUT VOLTAGE (V) –VV

0.5

∆VO = 100 mV

0 25 50 75 100 125 150

TJ, JUNCTION TEMPERATURE (°C)

IO = 500 mA

IO = 100 mA IO = 10 mA

Figure 3. Peak Output Current versus

Dropout Voltage

100

= 500 mA

N ( T

E RE PP

RR, R

1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M

Figure 5. Ripple Rejection versus Frequency Figure 6. Ripple Rejection versus Output Current

4.0

out

Vin = 10 V CO = 0 TJ = 25°C

out

= 500 mA

= 5.0 V

f, FREQUENCY (Hz)

TJ = 25°C

100

RR, RIPPLE REJECTION (dB)

40 30

0.01 0.1 0.5 1.0 10

5.0

Figure 4. Dropout Voltage versus

Junction T emperature

= 5.0 V

out

Vin = 10 V CO = 0 f = 120 Hz TJ = 25°C

IO, OUTPUT CURRENT (A)

3.0

2.0

, BIAS CURRENT (mA)

1.0

0 5.0 10 15 20 25 30 35 40

TJ = 25°C

TJ = 125°C

VO = 5.0 V IO = 0.5 A

VI, INPUT VOLTAGE (Vdc)

Figure 7. Bias Current versus Input V oltage

4.0

3.0

2.0

, BIAS CURRENT (mA)

1.0

http://onsemi.com

TJ = 25°C

TJ = 125°C

VI–VO = 5.0 V

0.01 0.1 0.5 1.0 10 IO, OUTPUT CURRENT (A)

Figure 8. Bias Current versus Output Current

Page 9

MC78M00, MC78M00A Series

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

Input

0.33 µF

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:

MC78M05C

5.0 V

IO =

Constant Current to Grounded

+ I

Load

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.

VO, 7.0 V to 20 V Vin–V

≥ 2.0 V

out

Output

0.1 µF

10 k

Input

0.33 µF

MC78M05C

1.0 k

MC1741

IIB = 1.5 mA over line and load changes.

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.

Figure 9. Current Regulator

MJ2955 or Equiv.

Input

1.0 µF

XX = 2 digits of type number indicating voltage.

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.

MC78MXXC

1.0 µF

Output

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.

Figure 10. Adjustable Output Regulator

MJ2955 or Equiv.

Input

The circuit of Figure 11 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.

2N6049 or Equiv.

1.0 µF

XX = 2 digits of type number indicating voltage.

MC78MXXC

Output

Figure 11. Current Boost Regulator Figure 12. Current Boost with

Short Circuit Protection

http://onsemi.com

Page 10

MC78M00, MC78M00A Series

DPAK

75 Units/Rail

2500 Units/Reel

+125°C

5.0 V

TO–220

50 Units/Rail

40° to +125°C

+125°C

TO–220

50 Units/Rail

DPAK

75 Units/Rail

2500 Units/Reel

+125°C

8.0 V

TO–220

50 Units/Rail

40° to +125°C

+125°C

9.0 V

40° to +125°C

DPAK

75 Units/Rail

2500 Units/Reel

+125°C

12 V

TO–220

50 Units/Rail

40° to +125°C

DPAK

75 Units/Rail

2500 Units/Reel

+125°C

15 V

TO–220

50 Units/Rail

40° to +125°C

+125°C

20 V

TO–220

50 Units/Rail

24 V

ORDERING INFORMATION

Device Output Voltage Temperature Range Package

MC78M05CDT/RK MC78M05ACDT/RK MC78M05CT MC78M05ACT MC78M05BDT/RK MC78M05BT MC78M06CDT/RK MC78M06CT MC78M06BT MC78M08CDT/RK MC78M08ACDT/RK MC78M08CT MC78M08ACT MC78M08BDT/RK MC78M08BT MC78M09CDT/RK MC78M09CT MC78M09BDT/RK MC78M09BT MC78M12CDT/RK MC78M12ACDT/RK MC78M12CT MC78M12ACT MC78M12BDT/RK MC78M12BT MC78M15CDT/RK MC78M15ACDT/RK MC78M15CT MC78M15ACT MC78M15BDT/RK MC78M15BT MC78M18CDT MC78M18CT MC78M18BT MC78M20CT MC78M20BT MC78M24CT MC78M24BT

6.0 V

18 V

= 0° to

= –

= 0° to

TJ = –40° to +125°C

= 0° to

= –

= 0° to

= –

= 0° to

= –

= 0° to

= –

= 0° to

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

Shipping

Rails

(No Suffix)

DPAK 75 Units/Rail 2500 Units/Reel

TO–220 50 Units/Rail –

DPAK

DPAK 75 Units/Rail 2500 Units/Reel

TO–220 50 Units/Rail –

DPAK

TO–220

DPAK 75 Units/Rail 2500 Units/Reel

TO–220 50 Units/Rail –

DPAK 75 Units/Rail 2500 Units/Reel

TO–220 50 Units/Rail –

DPAK 75 Units/Rail 2500 Units/Reel

TO–220 50 Units/Rail

DPAK

75 Units/Rail 2500 Units/Reel

75 Units/Rail 2500 Units/Reel 50 Units/Rail –

75 Units/Rail

Tape & Reel

(RK Suffix)

–

http://onsemi.com

Page 11

MC78M00, MC78M00A Series

P ACKAGE DIMENSIONS

TO–220

T SUFFIX

CASE 221A–09

ISSUE AA

SEATING

–T–

PLANE

123

R J

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED.

DIM MIN MAX MIN MAX

A 0.570 0.620 14.48 15.75 B 0.380 0.405 9.66 10.28 C 0.160 0.190 4.07 4.82 D 0.025 0.035 0.64 0.88

F 0.142 0.147 3.61 3.73 G 0.095 0.105 2.42 2.66 H 0.110 0.155 2.80 3.93 J 0.018 0.025 0.46 0.64 K 0.500 0.562 12.70 14.27 L 0.045 0.060 1.15 1.52 N 0.190 0.210 4.83 5.33 Q 0.100 0.120 2.54 3.04 R 0.080 0.110 2.04 2.79 S 0.045 0.055 1.15 1.39 T 0.235 0.255 5.97 6.47 U 0.000 0.050 0.00 1.27 V 0.045 ––– 1.15 ––– Z ––– 0.080 ––– 2.04

MILLIMETERSINCHES

DPAK

DT SUFFIX

CASE 369A–13

ISSUE Z

NOTES:

SEATING

–T–

PLANE

123

2 PL

0.13 (0.005) T

1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

DIM MIN MAX MIN MAX

A 0.235 0.250 5.97 6.35 B 0.250 0.265 6.35 6.73 C 0.086 0.094 2.19 2.38 D 0.027 0.035 0.69 0.88 E 0.033 0.040 0.84 1.01 F 0.037 0.047 0.94 1.19 G 0.180 BSC 4.58 BSC H 0.034 0.040 0.87 1.01

J 0.018 0.023 0.46 0.58 K 0.102 0.114 2.60 2.89 L 0.090 BSC 2.29 BSC R 0.175 0.215 4.45 5.46 S 0.020 0.050 0.51 1.27 U 0.020 ––– 0.51 ––– V 0.030 0.050 0.77 1.27 Z 0.138 ––– 3.51 –––

MILLIMETERSINCHES

http://onsemi.com

Page 12

MC78M00, MC78M00A Series

ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes

without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability , including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly , any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer .

PUBLICATION ORDERING INFORMATION

NORTH AMERICA Literature Fulfillment:

Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA

Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada Email: [email protected]

Fax Response Line: 303–675–2167 or 800–344–3810 T oll Free USA/Canada

N. American Technical Support: 800–282–9855 Toll Free USA/Canada EUROPE: LDC for ON Semiconductor – European Support

German Phone : (+1) 303–308–7140 (M–F 1:00pm to 5:00pm Munich T ime)

Email: ONlit–[email protected]

French Phone: (+1) 303–308–7141 (M–F 1:00pm to 5:00pm Toulouse Time)

Email: ONlit–[email protected]

English Phone: (+1) 303–308–7142 (M–F 12:00pm to 5:00pm UK Time)

Email: [email protected]