PANASONIC AN7808F

Voltage Regulators
AN78xx/AN78xxF Series
3-pin positive output voltage regulator (1 A type)
■ Overview
AN78xx series
Unit: mm
(10.35)
10.0±0.3
The AN78xx series and the AN78xxF series are 3pin, fixed positive output type monolithic voltage regulators. Stabilized fixed output voltage is obtained from
unstable DC input voltage without using any external
components. 11 types of fixed output voltage are available; 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, and
24V. They can be used widely in power circuits with current capacity of up to 1A.
4.5±0.2
1.4±0.1
1.4 +0.15
–0.05
12.5±0.2
17.0±0.2
26.1±0.2
29.0±0.3
15.4±0.2
(13.6)
(4.5)
8.7±0.2
2.9±0.1
φ3.7±0.1
0.8 +0.15
–0.05
■ Features
0.45 +0.2
–0.0
2.54 2.54
(2.0) (2.5)
1: Input
2: Common
3: Output
10.5±0.3
HSIP003-P-0000
AN78xxF series
Unit: mm
(1.73)
13.60±0.25
4.50±0.25
8.70±0.30
17.00±0.25
φ3.10±0.10
2.77±0.30
4.20±0.25
3.80±0.25
10.50±0.30
φ5.30
(4.30)
16.70±0.30
• No external components
• Output voltage: 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V,
20V, 24V
• Built-in overcurrent limit circuit
• Built-in thermal overload protection circuit
• Built-in ASO (area of safe operation) protection circuit
(0.40)
0.80±0.20 2.00±0.25
1.40±0.20
4.50±0.30
2.54
1
2
0.40+0.10
−0.05
2.50±0.25
1: Input
2: Common
3: Output
3
HSIP003-P-0000A
■ Block Diagram
1
Input
Pass Tr
Q1
Current
Source
Current
Limiter
RSC
3
Starter
Voltage
Reference
+
Error Amp.
Output
R2
Thermal
Protection
−
R1
2
Common
1
AN78xx/AN78xxF Series
Voltage Regulators
■ Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Input voltage
Power dissipation
VI
AN78xx series
PD
AN78xxF series
Rating
35 *1
Unit
40 *2
15 *3
V
V
W
10.25 *3
Operating ambient temperature
Topr
−30 to +80
°C
Storage temperature
Tstg
−55 to +150
°C
*1 AN7805/F, AN7806/F, AN7807/F, AN7808/F, AN7809/F, AN7810/F, AN7812/F, AN7815/F, AN7818/F
*2 AN7820/F, AN7824/F
*3 Follow the derating curve. When Tj exceeds 150°C, the internal circuit cuts off the output.
■ Electrical Characteristics at Ta = 25°C
• AN7805, AN7805F (5V type)
Parameter
Symbol
Output voltage
VO
Output voltage tolerance
VO
Line regulation
REGIN
Load regulation
REGL
Bias current
Conditions
Tj = 25°C
VI = 8 to 20V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Min
4.8
Typ
5
4.75
Max
Unit
5.2
V
5.25
V
VI = 7.5 to 25 V, Tj = 25°C
3
100
mV
VI = 8 to 12V, Tj = 25°C
1
50
mV
IO = 5mA to 1.5A, Tj = 25°C
15
100
mV
IO = 250 to 750mA, Tj = 25°C
5
50
mV
Tj = 25°C
8
mA
Bias current fluctuation to input
∆IBias(IN)
VI = 7.5 to 25V, Tj = 25°C
1.3
mA
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
0.5
mA
Output noise voltage
Ripple rejection ratio
Minimum input/output voltage difference
Output impedance
IBias
Vno
f = 10Hz to 100kHz
RR
VI = 8 to 18V, IO = 100mA, f = 120Hz
VDIF(min)
ZO
IO = 1A, Tj = 25°C
f = 1kHz
IO(Short)
VI = 25V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
Output short-circuit current
3.9
40
62
µV
dB
2
V
17
mΩ
700
mA
2
A
− 0.3
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 10V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
2
Voltage Regulators
AN78xx/AN78xxF Series
■ Electrical Characteristics at Ta = 25°C (continued)
• AN7806, 7806F (6V type)
Parameter
Symbol
Output voltage
VO
Output voltage tolerance
VO
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Conditions
Tj = 25°C
VI = 9 to 21V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Min
5.75
Typ
6
5.7
VI = 8.5 to 25V, Tj = 25°C
Max
Unit
6.25
V
6.3
V
5
120
mV
VI = 9 to 13V, Tj = 25°C
1.5
60
mV
IO = 5mA to 1.5A, Tj = 25°C
14
120
mV
IO = 250 to 750mA, Tj = 25°C
4
60
mV
Tj = 25°C
8
mA
Bias current fluctuation to input
∆IBias(IN)
VI = 8.5 to 25V, Tj = 25°C
1.3
mA
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
0.5
mA
Output noise voltage
Ripple rejection ratio
Minimum input/output voltage difference
Output impedance
Vno
RR
VDIF(min)
ZO
3.9
f = 10Hz to 100kHz
VI = 9 to 19V, IO = 100mA, f = 120Hz
59
IO = 1A, Tj = 25°C
f = 1kHz
IO(Short)
VI = 25V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
Output short-circuit current
µV
40
dB
2
V
17
mΩ
700
mA
2
A
− 0.4
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 11V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
• AN7807, 7807F (7V type)
Parameter
Symbol
Conditions
Output voltage
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 10 to 22V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Min
6.7
Typ
7
6.6
Max
Unit
7.3
V
7.4
V
VI = 9.5 to 25V, Tj = 25°C
5
140
mV
VI = 10 to 15V, Tj = 25°C
1.5
70
mV
IO = 5mA to 1.5A, Tj = 25°C
14
140
mV
4
70
mV
3.9
8
mA
IO = 250 to 750mA, Tj = 25°C
Tj = 25°C
Bias current fluctuation to input
∆IBias(IN)
VI = 9.5 to 25V, Tj = 25°C
1
mA
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
0.5
mA
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 10 to 20V, IO = 100mA, f = 120Hz
Minimum input/output voltage difference
Output impedance
VDIF(min)
ZO
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 25V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
46
57
µV
dB
2
V
16
mΩ
700
mA
2
A
− 0.5
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 12V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
3
AN78xx/AN78xxF Series
Voltage Regulators
■ Electrical Characteristics at Ta = 25°C (continued)
• AN7808, 7808F (8V type)
Parameter
Symbol
Conditions
Output voltage
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 11 to 23V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Output impedance
ZO
V
mV
mV
IO = 5mA to 1.5A, Tj = 25°C
12
160
mV
IO = 250 to 750mA, Tj = 25°C
4
80
mV
3.9
8
mA
1
mA
0.5
mA
Tj = 25°C
f = 10Hz to 100kHz
VI = 11.5 to 21.5V, IO = 100mA, f = 120Hz
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
dB
56
f = 1kHz
VI = 25V, Tj = 25°C
µV
52
IO = 1A, Tj = 25°C
IO(Short)
Output short-circuit current
8.4
80
IO = 5mA to 1A, Tj = 25°C
RR
V
160
∆IBias(L)
VDIF(min)
8.3
2
Bias current fluctuation to load
Minimum input/output voltage difference
7.6
Unit
6
VI = 10.5 to 25V, Tj = 25°C
Ripple rejection ratio
8
Max
VI = 11 to 17V, Tj = 25°C
∆IBias(IN)
Vno
7.7
Typ
VI = 10.5 to 25V, Tj = 25°C
Bias current fluctuation to input
Output noise voltage
Min
2
V
16
mΩ
700
mA
2
A
− 0.5
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 14V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
• AN7809, 7809F (9V type)
Symbol
Conditions
Output voltage
Parameter
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 12 to 24V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
REGIN
Load regulation
REGL
Bias current
IBias
Bias current fluctuation to input
∆IBias(IN)
Bias current fluctuation to load
∆IBias(L)
8.55
Max
Unit
9.35
V
9.45
V
7
180
mV
90
mV
IO = 5mA to 1.5A, Tj = 25°C
12
180
mV
IO = 250 to 750mA, Tj = 25°C
4
90
mV
3.9
8
mA
1
mA
0.5
mA
Tj = 25°C
VI = 11.5 to 26V, Tj = 25°C
IO = 5mA to 1A, Tj = 25°C
Ripple rejection ratio
RR
VI = 12 to 22V, IO = 100mA, f = 120Hz
ZO
9
2
f = 10Hz to 100kHz
Output impedance
Typ
VI = 11.5 to 26V, Tj = 25°C
Vno
VDIF(min)
8.65
VI = 12 to 18V, Tj = 25°C
Output noise voltage
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 26V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
57
56
µV
dB
2
V
16
mΩ
700
mA
2
A
− 0.5
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 15V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
4
Voltage Regulators
AN78xx/AN78xxF Series
■ Electrical Characteristics at Ta = 25°C (continued)
• AN7810, 7810F (10V type)
Parameter
Symbol
Conditions
Output voltage
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 13 to 25V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Unit
10.4
V
10.5
V
8
200
mV
100
mV
IO = 5mA to 1.5A, Tj = 25°C
12
200
mV
4
100
mV
3.9
8
mA
1
mA
0.5
mA
IO = 250 to 750mA, Tj = 25°C
Tj = 25°C
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 13 to 23V, IO = 100mA, f = 120Hz
ZO
Max
2.5
VI = 12.5 to 27V, Tj = 25°C
Output impedance
10
9.5
VI = 12.5 to 27V, Tj = 25°C
∆IBias(IN)
VDIF(min)
9.6
Typ
VI = 13 to 19V, Tj = 25°C
Bias current fluctuation to input
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 27V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
µV
63
56
dB
2
V
16
mΩ
700
mA
2
A
− 0.6
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 16V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
• AN7812, 7812F (12V type)
Symbol
Conditions
Output voltage
Parameter
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 15 to 27V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Max
Unit
12.5
V
12.6
V
10
240
mV
3
120
mV
12
240
mV
IO = 250 to 750mA, Tj = 25°C
4
120
mV
Tj = 25°C
4
8
mA
1
mA
0.5
mA
VI = 14.5 to 30V, Tj = 25°C
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 15 to 25V, IO = 100mA, f = 120Hz
ZO
12
11.4
VI = 16 to 22V, Tj = 25°C
∆IBias(IN)
VDIF(min)
Typ
IO = 5mA to 1.5A, Tj = 25°C
Bias current fluctuation to load
Output impedance
11.5
VI = 14.5 to 30V, Tj = 25°C
Bias current fluctuation to input
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 30V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
75
55
µV
dB
2
V
18
mΩ
700
mA
2
A
− 0.8
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 19V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
5
AN78xx/AN78xxF Series
Voltage Regulators
■ Electrical Characteristics at Ta = 25°C (continued)
• AN7815, 7815F (15V type)
Parameter
Symbol
Conditions
Output voltage
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 18 to 30V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
V
11
300
mV
3
150
mV
12
300
mV
IO = 250 to 750mA, Tj = 25°C
4
150
mV
Tj = 25°C
4
8
mA
1
mA
0.5
mA
VI = 20 to 26V, Tj = 25°C
IO = 5mA to 1.5A, Tj = 25°C
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 18.5 to 28.5V, f = 120Hz
ZO
14.25
VI = 17.5 to 30V, Tj = 25°C
VI = 17.5 to 30V, Tj = 25°C
Output impedance
Unit
15.75
14.4
f = 1kHz
IO(Short)
VI = 30V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
µV
90
54
IO = 1A, Tj = 25°C
Output short-circuit current
15
Max
V
∆IBias(IN)
VDIF(min)
Typ
15.6
Bias current fluctuation to input
Minimum input/output voltage difference
Min
dB
2
V
19
mΩ
700
mA
2
A
−1
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 23V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
• AN7818, 7818F (18V type)
Symbol
Conditions
Output voltage
Parameter
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 21 to 33V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Max
Unit
18.7
V
18.9
V
14
360
mV
4
180
mV
12
360
mV
IO = 250 to 750mA, Tj = 25°C
4
180
mV
4.1
8
mA
1
mA
0.5
mA
Tj = 25°C
VI = 21 to 33V, Tj = 25°C
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 22 to 32V, IO = 100mA, f = 120Hz
ZO
18
IO = 5mA to 1.5A, Tj = 25°C
∆IBias(IN)
VDIF(min)
Typ
17.1
VI = 24 to 30V, Tj = 25°C
Bias current fluctuation to load
Output impedance
17.3
VI = 21 to 33V, Tj = 25°C
Bias current fluctuation to input
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 35V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
110
53
µV
dB
2
V
16
mΩ
700
mA
2
A
−1.1
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 27V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
6
Voltage Regulators
AN78xx/AN78xxF Series
■ Electrical Characteristics at Ta = 25°C (continued)
• AN7820, 7820F (20V type)
Parameter
Symbol
Conditions
Output voltage
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 24 to 35V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD ≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
20.8
V
21
V
400
mV
5
200
mV
12
400
mV
4
200
mV
4.1
8
mA
1
mA
0.5
mA
IO = 5mA to 1.5A, Tj = 25°C
IO = 250 to 750mA, Tj = 25°C
Tj = 25°C
Bias current fluctuation to load
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 24 to 34V, IO = 100mA, f = 120Hz
ZO
19
Unit
15
VI = 23 to 35V, Tj = 25°C
Output impedance
20
Max
VI = 23 to 35V, Tj = 25°C
∆IBias(IN)
VDIF(min)
19.2
Typ
VI = 26 to 32V, Tj = 25°C
Bias current fluctuation to input
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 35V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
µV
110
53
dB
2
V
22
mΩ
700
mA
2
A
−1.2
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 29V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
• AN7824, 7824F (24V type)
Symbol
Conditions
Output voltage
Parameter
VO
Output voltage tolerance
VO
Tj = 25°C
VI = 28 to 38V, IO = 5mA to 1A,
Tj = 0 to 125°C, PD≤ *
Line regulation
Load regulation
Bias current
REGIN
REGL
IBias
Max
Unit
25
V
25.2
V
18
480
mV
6
240
mV
12
480
mV
IO = 250 to 750mA, Tj = 25°C
4
240
mV
4.1
8
mA
1
mA
0.5
mA
Tj = 25°C
VI = 27 to 38V, Tj = 25°C
∆IBias(L)
IO = 5mA to 1A, Tj = 25°C
Output noise voltage
Vno
f = 10Hz to 100kHz
Ripple rejection ratio
RR
VI = 28 to 38V, IO = 100mA, f = 120Hz
ZO
24
IO = 5mA to 1.5A, Tj = 25°C
∆IBias(IN)
VDIF(min)
Typ
22.8
VI = 30 to 36V, Tj = 25°C
Bias current fluctuation to load
Output impedance
23
VI = 27 to 38V, Tj = 25°C
Bias current fluctuation to input
Minimum input/output voltage difference
Min
IO = 1A, Tj = 25°C
f = 1kHz
Output short-circuit current
IO(Short)
VI = 38V, Tj = 25°C
Peak output current
IO(Peak)
Tj = 25°C
Output voltage temperature coefficient
∆VO/Ta
IO = 5mA, Tj = 0 to 125°C
170
50
µV
dB
2
V
28
mΩ
700
mA
2
A
−1.4
mV/°C
Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the
characteristic value drift due to the chip junction temperature rise can be ignored.
Note 2) Unless otherwise specified, VI = 33V, IO = 500mA, CI = 0.33µF and CO = 0.1µF.
* AN78xx series: 15W, AN78xxF series: 10.25W
7
AN78xx/AN78xxF Series
Voltage Regulators
■ Main Characteristic Curve
PD  Ta (AN78xxF series)
16
(1)
14
(2)
Power dissipation PD (W)
12
10
8
(3)
6
4
(1)
10
8
(2)
6
(3)
4
2
(4)
0
40
80
120
0
160
(4)
0
Ambient temperature Ta (°C)
160
Thermal resistance value:
Rth(j-c) = 12.2°C/W (max.)
Rth(j-a) = 65°C/W (max.)
Installation condition to heat sink
Tightening torque 6kg·cm
Heat radiation compound used
Installation condition to heat sink
Tightening torque 6kg·cm
Heat radiation compound used
(1) Infinite heat sink: 10.25W
(2) 5°C/W heat sink: 7.3W
(3) 15°C/W heat sink: 4.5W
(4) Without heat sink: 1.923W
Infinite heat sink: 15.0W
5°C/W heat sink: 12.5W
15°C/W heat sink: 6.3W
Without heat sink: 1.923W
AN7805
15
10
5
10
0
−10
0
2
4
6
Time t (µs)
8
10
Input voltage VI (V)
Output voltage fluctuation (V)
Load transient response
20
Output voltage fluctuation (mV)
120
Ambient temperature Ta (°C)
Input transient response
8
80
Thermal resistance value:
Rth(j-c) = 5°C/W (max.)
Rth(j-a) = 65°C/W (max.)
(1)
(2)
(3)
(4)
−20
40
AN7805
2
1
0
1
0
−1
−2
VDIF(min.)  Tj
2.4
2.0
IO = 1A
500mA
1.6
200mA
20mA
1.2
0.8
0mA
0.4
0
−40
0
40
80
120
160
Junction temperature Tj (°C)
Current limiting characteristic
Load current IO (A)
2
12
7
VI = 10V
Tj = 25°C
AN7805
6
Output voltage VO (V)
Power dissipation PD (W)
14
0
Minimum input/output voltage difference VDIF(min.) (V)
PD  Ta (AN78xx series)
16
5
4
3
2
1
0
0
10
20
30
Time t (µs)
40
50
0
0.6
1.2
1.8
Output current IO (A)
2.4
Voltage Regulators
AN78xx/AN78xxF Series
■ Basic Regulator Circuit
Input
Output
1
3
AN78xx
AN78xxF
CI
CO
2
CI : CI is necessary when the input line is long.
CO: CO improves the transient response.
Common
■ Usage Notes
1. Cautions for a basic circuit
CI: When a wiring from a smoothing circuit to a three-pin regulator
is long, it is likely to oscillate in output. A capacitor of 0.1µF to
0.47µF should be connected near an input pin.
CO: When any sudden change of load current is likely to occur,
connect an electrolytic capacitor of 10µF to 100µF to improve a
transitional response of output voltage.
Di: Normally unnecessary. But add it in the case that there is a
residual voltage at the output capacitor Co even after switching
off the supply power because a current is likely to flow into an
output pin of the IC and damage the IC.
Di
VI
VO
3
1
CO
2
CI
Figure 1
2. Other caution items
1) Short-circuit between the input pin and GND pin
If the input pin is short-circuitted to GND or is cut
off when a large capacitance capacitor has been connected to the IC's load, a voltage of a capacitor connected to an output pin is applied between input/output of the IC and this likely results in damage of the
IC. It is necessary, therefore, to connect a diode, as
shown in figure 2, to counter the reverse bias between
input/output pins.
In
3
1
Output
Out
2
GND
+
−
CO
Figure 2
2) Floating of GND pin
If a GND pin is made floating in an operating mode, an unstabilized input voltage is outputted. In this case, a
thermal protection circuit inside the IC does not normally operate. In this state, if the load is short-circuited or
overloaded, it is likely to damage the IC.
■ Application Circuit Examples
1. Current bootstrap circuit
VI
2. Adjustable output regulator
Q1
VI
3Ω
1
IO
2
1
0.33µF
3
AN78xx
AN78xxF
2
VO
3
AN78xx
AN78xxF
VO'
R2
VO
0.1µF
V '
VO = VO' + IBias + RO R1
2
IBias
R1
Note) VO varies due to sample to sample variation
of IBias.
Never fail to adjust individually with R1.
9