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Voltage Regulators
AN78Lxx/AN78LxxM Series
3-pin positive output voltage regulator (100 mA type)
I Overview
The AN78Lxx series and the AN78LxxM series are 3pin fixed positive output type monolithic voltage regulator. A stabilized fixed output voltage is obtained from an unstable DC input voltage without using any external parts. 12 types of fixed output voltage are available; 4V, 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V and 24V. They can be used widely as power circuits with a current capacity of up to 100mA. AN78Lxx series
5.00.2
Unit: mm
4.00.2
(1.0)
5.10.2
2.30.2 0.60.15
(1.0) 13.50.5
0.43+0.1 -0.05
0.43+0.1 -0.05
I Features
* No external components * Output voltage: 4V, 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, 24V * Built-in overcurrent limit circuit * Built-in thermal overload protection circuit
2.54
231
1: Input 2: Output 3: Common
SSIP003-P-0000
AN78LxxM series
4.6 max. 1.8 max.
Unit: mm
1.6 max.
0.48 max. 1.5 3.0
0.58 max.
0.8 min.
4.25 max.
0.44 max.
2.6 max.
2.6
45
1
2
3
1: Output 2: Common 3: Input
I Block Diagram (AN78Lxx series)
HSIP003-P-0000B
1 Pass Tr Q1 Current Source Current Limiter RSC 2 Starter Voltage Reference
Input (3)
+
Error Amp.
R2 Thermal Protection R1 3
Output (1)
-
Common (2)
Note) The number in ( ) shows the pin number for the AN78LxxM series.
Publication date: August 2001
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1
AN78Lxx/AN78LxxM Series
I Absolute Maximum Ratings at Ta = 25C
Parameter Input voltage Power dissipation Operating ambient temperature Storage temperature AN78Lxx series AN78LxxM series Symbol VI PD Topr Tstg Rating 35 *1 40 *2 650 *3 -30 to +80 -55 to +150 -55 to +125 Unit V V mW C C
*1 AN78L04/M, AN78L05/M, AN78L06/M, AN78L07/M, AN78L08/M, AN78L09/M, AN78L10/M, AN78L12/M, AN78L15/M *2 AN78L18/M, AN78L20/M, AN78L24/M *3 Follow the derating curve. When Tj exceeds 150C, the internal circuit cuts off the output. AN78LxxM series is mounted on a standard board (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more).
I Electrical Characteristics at Ta = 25C
* AN78L04, AN78L04M (4V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 6.5 to 19V, IO = 1 to 70mA VI = 6.5 to 19V, Tj = 25C VI = 7 to 19V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 7 to 19V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 7 to 17V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 48 40 58 1.7 140 - 0.6 Conditions Min 3.84 3.8 50 40 10 4.5 2 Typ 4 Max 4.16 4.2 145 95 55 30 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 9V, IO = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L04) and Tj = 0 to 100C (AN78L04M)
2
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L05, AN78L05M (5V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 7.5 to 20V, IO = 1 to 70mA VI = 7.5 to 20V, Tj = 25C VI = 8 to 20V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 8 to 20V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 8 to 18V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 47 40 57 1.7 140 - 0.65 Conditions Min 4.8 4.75 55 45 11 5 2 Typ 5 Max 5.2 5.25 150 100 60 30 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L05) and Tj = 0 to 100C (AN78L05M)
* AN78L06, AN78L06M (6V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 8.5 to 21V, IO = 1 to 70mA VI = 8.5 to 21V, Tj = 25C VI = 9 to 21V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 9 to 21V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 9 to 19V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 46 50 56 1.7 140 - 0.7 Conditions Min 5.76 5.7 60 50 12 5.5 2 Typ 6 Max 6.24 6.3 155 105 65 35 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L06) and Tj = 0 to 100C (AN78L06M)
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L07, AN78L07M (7V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 9.5 to 22V, IO = 1 to 70mA VI = 9.5 to 22V, Tj = 25C VI = 10 to 22V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 10 to 22V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 10 to 20V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 45 50 55 1.7 140 - 0.75 Conditions Min 6.72 6.65 70 60 13 6 2 Typ 7 Max 7.28 7.35 165 115 75 35 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L07) and Tj = 0 to 100C (AN78L07M)
* AN78L08, AN78L08M (8V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 10.5 to 23V, IO = 1 to 70mA VI = 10.5 to 23V, Tj = 25C VI = 11 to 23V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 11 to 23V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 11 to 21V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 44 60 54 1.7 140 - 0.8 Conditions Min 7.7 7.6 80 70 15 7 2 Typ 8 Max 8.3 8.4 175 125 80 40 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L08) and Tj = 0 to 100C (AN78L08M)
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L09, AN78L09M (9V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 11.5 to 24V, IO = 1 to 70mA VI = 11.5 to 24V, Tj = 25C VI = 12 to 24V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 12 to 24V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 12 to 22V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 43 65 53 1.7 140 - 0.85 Conditions Min 8.64 8.55 90 80 16 8 2 Typ 9 Max 9.35 9.45 190 140 85 45 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L09) and Tj = 0 to 100C (AN78L09M)
* AN78L10, AN78L10M (10V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 12.5 to 25V, IO = 1 to 70mA VI = 12.5 to 25V, Tj = 25C VI = 13 to 25V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 13 to 25V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 13 to 23V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 42 70 52 1.7 140 - 0.9 Conditions Min 9.6 9.5 100 90 17 9 2 Typ 10 Max 10.4 10.5 210 160 90 45 3 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L10) and Tj = 0 to 100C (AN78L10M)
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L12, AN78L12M (12V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 14.5 to 27V, IO = 1 to 70mA VI = 14.5 to 27V, Tj = 25C VI = 15 to 27V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 15 to 27V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 15 to 25V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 40 80 50 1.7 140 -1 Conditions Min 11.5 11.4 120 100 20 10 2 Typ 12 Max 12.5 12.6 250 200 100 50 3.5 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L12) and Tj = 0 to 100C (AN78L12M)
* AN78L15, AN78L15M (15V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 17.5 to 30V, IO = 1 to 70mA VI = 17.5 to 30V, Tj = 25C VI = 18 to 30V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 18 to 30V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 18 to 28V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 38 90 48 1.7 140 -1.3 Conditions Min 14.4 14.25 130 110 25 12 2 Typ 15 Max 15.6 15.75 300 250 150 75 3.5 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L15) and Tj = 0 to 100C (AN78L15M)
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L18, AN78L18M (18V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 20.5 to 33V, IO = 1 to 70mA VI = 20.5 to 33V, Tj = 25C VI = 21 to 33V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 21 to 33V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 21 to 31V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 36 150 46 1.7 140 -1.5 Conditions Min 17.3 17.1 45 35 30 15 2 Typ 18 Max 18.7 18.9 300 250 170 85 3.5 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L18) and Tj = 0 to 100C (AN78L18M)
* AN78L20, AN78L20M (20V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 22.5 to 35V, IO = 1 to 70mA VI = 22.5 to 35V, Tj = 25C VI = 23 to 35V, Tj = 25C IO = 1 to 100mA, Tj = 25C IO = 1 to 40mA, Tj = 25C Tj = 25C VI = 23 to 35V, Tj = 25C IO = 1 to 40mA, Tj = 25C f = 10Hz to 100kHz VI = 23 to 33V, IO = 40mA, f = 120Hz Tj = 25C Tj = 25C, VI = 35V IO = 5mA, Tj = 0 to 125C 34 170 44 1.7 140 -1.7 Conditions Min 19.2 19 50 40 35 17 2 Typ 20 Max 20.8 21 300 250 180 90 3.5 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L20) and Tj = 0 to 100C (AN78L20M)
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AN78Lxx/AN78LxxM Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78L24, AN78L24M (24V type)
Parameter Output voltage Output voltage tolerance Line regulation Load regulation Bias current Bias current fluctuation to input Bias current fluctuation to load Output noise voltage Ripple rejection ratio Minimum input/output voltage difference Output short-circuit current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) VO/Ta Tj = 25C VI = 26.5 to 39V, IO = 1 to 70mA VI = 26.5 to 39V, Tj = 25 VI = 27 to 39V, Tj = 25 IO = 1 to 100mA, Tj = 25 IO = 1 to 40mA, Tj = 25 Tj = 25C VI = 27 to 39V, Tj = 25 IO = 1 to 40mA, Tj = 25 f = 10Hz to 100kHz VI = 27 to 37V, IO = 40mA, f = 120Hz Tj = 25 Tj = 25 , VI = 35V IO = 5mA, Tj = 0 to 125 34 200 44 1.7 140 -2 Conditions Min 23 22.8 60 50 40 20 2 Typ 24 Max 25 25.2 300 250 200 100 3.5 1 0.1 Unit V V mV mV mV mV mA mA mA V dB V mA mV/C
Note 1) The specified condition Tj = 25C 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 = 40mA, CI = 0.33F, CO = 0.1F, Tj = 0 to 125C (AN78L24) and Tj = 0 to 100C (AN78L24M)
8
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AN78Lxx/AN78LxxM Series
I Main Characteristics
1.0 1.0 Mounted on standard board (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more)
Minimum input/output voltage difference VDIF(min) (V)
PD Ta (AN78Lxx series)
PD Ta (AN78LxxM series)
VDIF(min) Tj
2.5
Power dissipation PD (W)
Power dissipation PD (W)
0.8
Independent IC without a heat sink Rth(j-a) = 190C/W PD = 658mW (25C)
0.8
2.0
IO = 10 0mA 70mA
0.6
0.6
1.5
40mA 1mA
0.4
0.4
1.0
0.2
0.2
0.5
0 0 20 40 60 80 100 120 140 160
0 0 20 40 60 80 100 120 140 160
0 0 25 50 75 100 125
Ambient temperature Ta (C)
Ambient temperature Ta (C)
Junction temperature Tj (C)
RR f
100 AN78L05 VI = 8 to 18V IO = 40mA
Input transient response
AN78L05 15
Load transient response
Input voltage VI (V) Output voltage fluctuation (V)
AN78L05 0.2
Ripple rejection RR (dB)
80
0.1
10
Output voltage fluctuation (mV)
60
0 1
10
5
40
0
0
20
-10
-1
0 10 100 1k 10k 100k
-20
0
2
4
6
8
10
-2
0
10
20
30
40
50
Frequency f (Hz)
Time t (s)
Time t (s)
IBias Ta
3.0 AN78L05 IO = 5mA 2.5
Bias current IBias (mA)
VIN = 28V
2.0
18V
1.5
10V
1.0
0.5
0
25
0
25
50
75
100
125
Ambient temperature Ta (C)
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Output current IO (A)
20
9
AN78Lxx/AN78LxxM Series
I Basic Regulator Circuit
Input 1 2 Output
AN78Lxx
CI 3 CO
CI is necessary when the input line is long. CO improves the transient response.
I Usage Notes
1. Cautions for a basic circuit
Di
VI 1 2 3
VO
CI
CO
Figure 1
CI: When a wiring from a smoothing circuit to a three-pin regulator is long, it is likely to oscillate at output. A capacitor of 0.1F to 0.47F should be connected near an input pin. CO: When any sudden change of load current is likely to occur, connect an electrolytic capacitor of 10F to 100F 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.
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
1 2 GND
3
Out
+ -
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.
I Application Circuit Examples
VI Q1 VI 20 1 0.33F 2 0.1F IO VO 1 3 2 VO' R2 VO
AN78Lxx
AN78Lxx
3 IBias
VO = VO' + IBias +
VO' R R2 1
R1
Note) VO varies due to sample to sample variation of IBias . Never fail to adjust individually with R1 .
10
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