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Voltage Regulators
AN78Nxx Series
3-pin positive output voltage regulator (300 mA type)
I Overview
The AN78Nxx series is a 3-pin, fixed positive output type monolithic voltage regulator. Stabilized fixed output voltage is obtained from unstable DC input voltage without using any external components. 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 in power circuits with current capacity of up to 300mA. AN78Nxx series
8.0 +0.5 -0.1 3.05
Unit : mm
3.8 1.94
0.750.25 4.6
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 * Built-in ASO (area of safe operation) protection circuit
15.0 min.
10.80.3
0.50.25 1.44 2.3
0.50.1 1.76
3.5 max.
1
2
3
1 : Input 2 : Common 3 : Output
SSIP003-P-0000E
I Block Diagram
1 Pass Tr Q1 Current Source Current Limiter RSC 3
Input
Output
Starter
Voltage Reference
+ Error Amp. -
R2 Thermal Protection
R1 2
Common
1
AN78Nxx Series
I Absolute Maximum Ratings at Ta = 25C
Parameter Input voltage Power dissipation Operating ambient temperature Storage temperature Symbol VI PD Topr Tstg Rating 35 *1 40 *2 8 *3 -20 to +80 -55 to +150
Voltage Regulators
Unit V V W C C
*1 AN78N04, AN78N05, AN78N06, AN78N07, AN78N08, AN78N09, AN78N10, AN78N12, AN78N15, AN78N18 *2 AN78N20, AN78N24 *3 Follow the derating curve. When Tj exceeds 150C, the internal circuit cuts off the output.
I Electrical Characteristics at Ta = 25C
* AN78N04 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 6.5 to 20V, IO = 5 to 200mA VI = 6.5 to 25V, Tj = 25C VI = 7 to 20V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 6.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 7 to 17V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 62 38 72 2 300 500 - 0.3 Conditions Min 3.84 3.8 9 4 20 10 2.8 Typ 4 Max 4.16 4.2 40 20 80 40 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
2
Voltage Regulators
I Electrical Characteristics at Ta = 25C (continued)
* AN78N05 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 7.5 to 20V, IO = 5 to 200mA VI = 7.5 to 25V, Tj = 25C VI = 8 to 20V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 7.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 8 to 18V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 62 Conditions Min 4.8 4.75
AN78Nxx Series
Typ 5 10 5 20 10 2.8
Max 5.2 5.25 50 25 100 50 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
40 72 2 300 500 - 0.3
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
* AN78N06 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 8.5 to 20V, IO = 5 to 200mA VI = 8.5 to 25V, Tj = 25C VI = 9 to 20V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 8.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 9 to 19V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 59 45 70 2 300 500 - 0.4 Conditions Min 5.75 5.7 11 6 20 10 2.8 Typ 6 Max 6.25 6.3 60 30 120 60 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
3
AN78Nxx Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78N07 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 9.5 to 20V, IO = 5 to 200mA VI = 9.5 to 25V, Tj = 25C VI = 10 to 20V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 9.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 10 to 20V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C Conditions
Voltage Regulators
Min 6.7 6.65
Typ 7 12 7 20 10 2.8
Max 7.3 7.35 70 35 140 70 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
50 57 69 2 300 500 - 0.4
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
* AN78N08 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 10.5 to 23V, IO = 5 to 200mA VI = 10.5 to 25V, Tj = 25C VI = 12 to 23V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 10.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 11 to 21V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 56 55 69 2 300 500 - 0.4 Conditions Min 7.7 7.6 13 8 25 10 2.8 Typ 8 Max 8.3 8.4 80 40 160 80 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
4
Voltage Regulators
I Electrical Characteristics at Ta = 25C (continued)
* AN78N09 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 11.5 to 24V, IO = 5 to 200mA VI = 11.5 to 25V, Tj = 25C VI = 13 to 24V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 11.5 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 12 to 22V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 56 Conditions Min 8.65 8.55
AN78Nxx Series
Typ 9 14 9 25 10 2.8
Max 9.35 9.45 90 45 180 90 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
60 68 2 300 500 - 0.5
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
* AN78N10 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 12.5 to 25V, IO = 5 to 200mA VI = 12.5 to 30V, Tj = 25C VI = 13 to 25V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 12.5 to 30V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 13 to 23V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 56 70 68 2 300 500 - 0.5 Conditions Min 9.6 9.5 15 10 25 10 2.8 Typ 10 Max 10.4 10.5 100 50 200 100 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
5
AN78Nxx Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78N12 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 14.5 to 27V, IO = 5 to 200mA VI = 14.5 to 30V, Tj = 25C VI = 16 to 27V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 14.5 to 30V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 15 to 25V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C Conditions
Voltage Regulators
Min 11.5 11.4
Typ 12 15 10 25 10 2.8
Max 12.5 12.6 100 50 240 120 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
80 55 67 2 300 500 - 0.6
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
* AN78N15 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 17.5 to 30V, IO = 5 to 200mA VI = 17.5 to 30V, Tj = 25C VI = 20 to 30V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 17.5 to 30V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 18.5 to 28.5V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 54 80 66 2 300 500 - 0.8 Conditions Min 14.4 14.25 16 11 25 10 2.8 Typ 15 Max 15.6 15.75 100 50 300 150 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
6
Voltage Regulators
I Electrical Characteristics at Ta = 25C (continued)
* AN78N18 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 21 to 33V, IO = 5 to 200mA VI = 21 to 33V, Tj = 25C VI = 22 to 33V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 21 to 33V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 22 to 32V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 53 Conditions Min 17.3 17.1
AN78Nxx Series
Typ 18 18 13 30 10 2.8
Max 18.7 18.9 100 50 360 180 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
90 65 2 300 500 -1.0
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
* AN78N20 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 23 to 35V, IO = 5 to 200mA VI = 23 to 35V, Tj = 25C VI = 24 to 35V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 23 to 35V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 24 to 34V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C 52 100 64 2 300 500 -1.2 Conditions Min 19.2 19.0 19 14 30 10 2.8 Typ 20 Max 20.8 21 100 50 400 200 5 0.8 0.5 Unit V V mV mV mV mV mA mA mA V dB V mA 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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
7
AN78Nxx Series
I Electrical Characteristics at Ta = 25C (continued)
* AN78N24 (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 Peak output current Output voltage temperature coefficient Symbol VO VO REGIN REGL IBias IBias(IN) IBias(L) Vno RR VDIF(min) IO(Short) IO(Peak) VO/Ta Tj = 25C VI = 27 to 38V, IO = 5 to 200mA VI = 27 to 38V, Tj = 25C VI = 28 to 38V, Tj = 25C IO = 1 to 300mA, Tj = 25C IO = 5 to 200mA, Tj = 25C Tj = 25C VI = 27 to 38V, Tj = 25C IO = 1 to 300mA, Tj = 25C f = 10Hz to 100kHz VI = 28 to 38V, IO = 50mA, f = 120Hz IO = 300mA, Tj = 25C VI = 35V, Tj = 25C Tj = 25C IO = 5mA, Tj = 0 to 125C Conditions
Voltage Regulators
Min 23 22.8
Typ 24 20 15 30 10 2.8
Max 25 25.2 100 50 480 240 5 0.8 0.5
Unit V V mV mV mV mV mA mA mA V dB V mA mA mV/C
110 50 63 2 300 500 -1.5
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 = 100mA, CI = 0.33F, CO = 0.1F and Tj = 0 to 125C
I Main Characteristics
Minimum input/output voltage difference VDIF(min) (V)
PD Ta (AN78Mxx series)
10
(1) Infinite heat sink (2) 5C/W heat sink (3) 15C/W heat sink (4) Without heat sink
VDIF(min) Tj
2.4
Input transient response
AN78N05
Power dissipation PD (W)
8
2.0
Output voltage fluctuation (mV)
6
Rth(j-c) = 15C/W (max.) Rth(j-a) = (1) 100C/W (max.) (2)
IO = 300mA IO = 100mA IO = 20mA
15
1.6
10
1.2
IO = 0
10
5
4 (3) 2 (4) 0 0 40 80 120 160
0.8
0
0.4
-10 -20
0 -120 -80 -40
0
40
80 120 160 200
0
2
4
6
8
10
Ambient temperature Ta (C)
Junction temperature Tj (C)
Time t (s)
8
Input voltage VI (V)
20
Voltage Regulators
I Main Characteristics (continued)
Load transient response
Load current IO (A)
120 AN78N05 AN78N05 0.3 0.2
AN78Nxx Series
RR f
Ripple rejection ratio RR (dB)
100
Output voltage fluctuation (V)
0.1 0 1
80
60
0
40
-1 -2
20
0 0 10 20 30 40 50 10 100 1k 10k 100k
Time t (s)
Frequency f (Hz)
I Basic Regulator Circuit
Input 1 3 Output
AN78Nxx
CI 2 Common 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.
9
AN78Nxx Series
I Usage Notes (continued)
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.
Voltage Regulators
In
1 2 GND
3
Out
Output
+ -
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 IO 2 1 3 VO IBias R1 VO 1 3 V O' R2
20
AN78Nxx
AN78Nxx
0.33F 2 0.1F
V' |VO | = VO' + IBias + RO R1 2 Note) VO varies due to sample to sample variation of IBias . Never fail to adjust individually with R1 .
10

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