LD1117-12-AA3-A-R [UTC]
LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS; 低压降固定和可调正电压调节器型号: | LD1117-12-AA3-A-R |
厂家: | Unisonic Technologies |
描述: | LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
文件: | 总12页 (文件大小:344K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LD1117/A
LINEAR INTEGRATED CIRCUIT
LOW DROP FIXED AND
ADJUSTABLE POSITIVE
VOLTAGE REGULATORS
DESCRIPTION
The UTC LD1117/A is a low dropout, 3-terminal positive
voltage regulator designed to provide output current up to
800mA/1A, There are adjustable version (VREF=1.25V) and various
fixed versions.
FEATURES
* Low dropout voltage
* Suitable for SCSI-2 active termination if VOUT set to 2.85V
* Output current up to 0.8A for 1117 and 1.0A for 1117A
* Built-in current limit and over temperature protection
* Available in ±1%(at 25°C) and 2% in all temperature range
* Low current consumption
*Pb-free plating product number:
LD1117L-xx / LD1117AL-xx
ORDERING INFORMATION
Order Number
②
③
Package
Pin Assignment
Packing
Normal
Lead Free Plating
LD1117①-xx-AA3-②-③
LD1117①-xx-AB3-②-③
LD1117①-xx-TA3-②-③
LD1117①-xx-TN3-②-③
LD1117①-xx-TQ2-②-③
LD1117①-xx-TQ3-②-③
LD1117①-xx-S08-②-③
LD1117①L-xx-AA3-②-③
LD1117①L-xx-AB3-②-③
LD1117①L-xx-TA3-②-③
LD1117①L-xx-TN3-②-③
LD1117①L-xx-TQ2-②-③
LD1117①L-xx-TQ3-②-③
LD1117①L-xx-S08-②-③
SOT-223
SOT-89
TO-220
TO-252
TO-263
TO-263-3
SOP-8
A: GOI
B: OGI
C: GIO
D: IGO
R: Tape Reel
T: Tube
GOOIxOOx
Note: Pin Assignment: I:VIN O:VOUT G:GND
www.unisonic.com.tw
1 of 12
Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R102-006,Q
LD1117/A
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-89
12 :1.2V
15 :1.5V
18 :1.8V
25 :2.5V
2J :2.85V
30 :3.0V
33 :3.3V
36 :3.6V
50 :5.0V
AD :ADJ
SOT-223
TO-220
TO-252
TO-263
TO-263-3
Note: Current code: Blank: 0.8A
A: 1A
PIN CONFIGURATION
GND
NC
1
2
3
4
8
7
6
5
VOUT
VOUT
NC
VOUT
VOUT
VIN
UNISONIC TECHNOLOGIES CO., LTD
2 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
3 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25℃)
PARAMETER
SYMBOL
VIN
RATINGS
18
UNIT
V
DC Input Voltage
Power Dissipation
Junction Temperature
Storage temperature
PD
Internally limited
+150
TJ
°C
°C
TSTG
-65 ~ +150
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING RATINGS
PARAMETER
SYMBOL
RATINGS
15
UNIT
Input Voltage
VIN
TJ
V
Operating Junction Temperature Range
0 ~ +125
°C
ELECTRICAL CHARACTERISTICS
(Ta=25℃, refer to the test circuits, TJ=0 to 125°C, Co=10μF unless otherwise specified)
For LD1117/A-1.2
PARAMETER
Output Voltage
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
1.212
UNIT
V
VOUT VIN=3.2V, IOUT=10mA, TJ=25°C
VIN=2.7 to 8V
1.188
1.200
Output Voltage
Line Regulation
Load Regulation
VOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
ΔVOUT VIN=2.7 to 8V, IOUT=0mA
VIN=2.7V
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1.176
1.200
1.224
6
V
1
1
mV
mV
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤10V
5
mA
LD1117
800
Current Limit
ILIMIT VIN=6.2V, TJ =25°C
mA
LD1117A 1000
Minimum Load Current
Output Noise Voltage
IO(MIN) VIN=15V
2
5
mA
eN
B=10Hz to 10KHz, TJ =25°C
100
μV
I
OUT=40mA, f=120Hz, TJ =25°C,
Supply Voltage Rejection
SVR
60
75
dB
VIN=4.2V, VRIPPLE=1Vpp
IOUT=100mA
I
I
I
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
UNISONIC TECHNOLOGIES CO., LTD
4 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For LD1117/A-1.5
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
1.515
UNIT
V
Output Voltage
Output Voltage
Line Regulation
Load Regulation
VOUT VIN=3.5V, IOUT=10mA, TJ=25°C
VIN=3 to 8V
VOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
ΔVOUT VIN=3 to 8V, IOUT=0mA
VIN=3V
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1.485
1.500
1.470
1.500
1.530
6
V
1
1
mV
mV
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤10V
5
mA
LD1117
LD1117A 1000
B=10Hz to 10KHz, TJ =25°C
800
Current Limit
ILIMIT VIN=6.5V, TJ =25°C
mA
μV
dB
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
OUT=40mA, f=120Hz, TJ =25°C,
SVR
60
VIN=4.5V, VRIPPLE=1Vpp
IOUT=100mA
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
For LD1117/A-1.8
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
1.820
UNIT
V
Output Voltage
VOUT VIN=3.8V, IOUT=10mA, TJ =25°C
VIN=3.3 to 8V
1.780
1.800
Output Voltage
Line Regulation
Load Regulation
VOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT VIN=3.3 to 8V, IOUT=0mA
VIN=3.3V
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1.760
1.800
1.840
6
V
1
1
mV
mV
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
10
10
V
VIN≤8V
5
mA
LD1117
LD1117A 1000
B=10Hz to 10KHz, TJ =25°C
800
Current Limit
ILIMIT VIN=6.8V, TJ =25°C
mA
μV
dB
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
OUT=40mA, f=120Hz, TJ =25°C,
SVR
60
VIN=5.5V, Vripple=1Vpp
IOUT=100mA
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
UNISONIC TECHNOLOGIES CO., LTD
5 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For LD1117/A-2.5
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
VIN=4.5V,IOUT=10mA,
TJ=25°C
MIN.
2.475
2.450
TYP.
2.500
2.500
MAX.
2.525
2.550
UNIT
V
1%
2%
Output Voltage
VIN=3.9 to 10V
LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
2%
4%
2.450
2.400
2.500
2.550
Output Voltage
Line Regulation
Load Regulation
VOUT
V
2.500
1
2.600
6
ΔVOUT VIN=3.9 to 10V, IOUT=0mA
VIN=3.9V
mV
mV
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤10V
5
mA
LD1117
LD1117A
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
VIN=5.5V, Vripple=1Vpp
IOUT=100mA
800
Current Limit
ILIMIT VIN=7.5V, TJ =25°C
mA
μV
dB
1000
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
SVR
60
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
For LD1117/A-2.85
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
2.880
UNIT
V
Output Voltage
VOUT VIN=4.85V, IOUT=10mA, TJ =25°C
2.828
2.850
VIN=4.25 to 10V
VOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
ΔVOUT VIN=4.25 to 10V, Io=0mA
VIN=4.25V
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
Output Voltage
Line Regulation
Load Regulation
2.790
2.850
2.910
6
V
1
1
mV
mV
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤10V
5
mA
LD1117
800
Current Limit
ILIMIT VIN=7.85V, TJ =25°C
mA
μV
dB
LD1117A
1000
Output Noise Voltage
Supply Voltage Rejection
eN
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
100
75
I
SVR
60
VIN=5.85V, Vripple=1Vpp
IOUT=100mA
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
UNISONIC TECHNOLOGIES CO., LTD
6 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For LD1117/A-3.0
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
2.970
2.940
TYP.
3.000
3.000
MAX.
3.030
3.060
UNIT
V
1%
2%
Output Voltage
VOUT VIN=5V,IOUT=10mA,TJ =25°C
VIN=4.5 to 10V
LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
2%
4%
2.940
2.880
3.000
3.060
Output Voltage
Line Regulation
Load Regulation
VOUT
V
3.000
1
3.120
6
ΔVOUT VIN=4.5 to 12V, IOUT=0mA
VIN=4.5V
mV
mV
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤10V
5
mA
LD1117
LD1117A
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
VIN=6V, VRIPPLE=1Vpp
IOUT=100mA
800
Current Limit
ILIMIT VIN=8V, TJ =25°C
mA
μV
dB
1000
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
SVR
60
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
For LD1117/A-3.3
PARAMETER
SYMBOL
VOUT
TEST CONDITIONS
MIN.
3.267
3.235
TYP.
3.300
3.300
MAX.
3.333
3.365
UNIT
V
VIN=5.3V,IOUT=10mA,
TJ=25°C
1%
2%
Output Voltage
VIN=4.75 to 10V
LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
2%
4%
3.235
3.160
3.300
3.365
Output Voltage
Line Regulation
Load Regulation
VOUT
V
3.300
1
3.440
6
ΔVOUT VIN=4.75 to 15V, IOUT=0mA
VIN=4.75V
mV
mV
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤15V
5
mA
LD1117
LD1117A
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
VIN=6.3V, VRIPPLE=1Vpp
IOUT=100mA
800
Current Limit
ILIMIT VIN=8.3V, TJ =25°C
mA
μV
dB
1000
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
SVR
60
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
UNISONIC TECHNOLOGIES CO., LTD
7 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For LD1117/A-3.6
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
3.636
UNIT
V
3.564
3.600
Output Voltage
Output Voltage
Line Regulation
Load Regulation
VOUT VIN=5.6V, IOUT=10mA, TJ =25°C
VIN=5 to 10V
3.528
3.600
3.672
6
VOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
ΔVOUT VIN=5 to 15V, IOUT=0mA
VIN=5V
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
V
1
1
mV
mV
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
IOUT=100mA
15
10
V
VIN≤15V
5
mA
LD1117
800
Current Limit
ILIMIT VIN=8.6V, Tj=25°C
mA
μV
dB
LD1117A
1000
Output Noise Voltage
Supply Voltage Rejection
eN
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
100
75
I
SVR
60
VIN=6.6V, VRIPPLE=1Vpp
IOUT=100mA
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
For LD1117/A-5.0
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
4.950
4.900
TYP.
5.000
5.000
MAX.
5.050
5.100
UNIT
V
1%
2%
Output Voltage
VOUT VIN=7V,IOUT=10mA, TJ =25°C
VIN=6.5 to 15V
LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1.0A
2%
4%
4.900
4.800
5.000
5.100
Output Voltage
Line Regulation
Load Regulation
VOUT
V
5.000
1
5.200
6
ΔVOUT VIN=6.5 to 15V, IOUT=0mA
VIN=6.5V
mV
mV
ΔVOUT LD1117 : IOUT=0 ~ 800mA
LD1117A : IOUT=0 ~ 1000mA
ΔVOUT
1
10
Temperature stability
Long Term Stability
Operating Input Voltage
Quiescent Current
0.5
0.3
%
%
ΔVOUT 1000 hrs, TJ =125°C
VIN
IQ
IOUT=100mA
15
10
V
VIN≤15V
5
mA
LD1117
LD1117A
B=10Hz to 10KHz, TJ =25°C
OUT=40mA, f=120Hz, TJ =25°C,
VIN=8V, VRIPPLE=1Vpp
IOUT=100mA
800
Current Limit
ILIMIT VIN=10V, TJ =25°C
mA
μV
dB
1000
Output Noise Voltage
Supply Voltage Rejection
eN
100
75
I
SVR
60
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000 mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
UNISONIC TECHNOLOGIES CO., LTD
8 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For LD1117/A-ADJUSTABLE
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
1.25
MAX
UNIT
V
Reference Voltage
VREF VIN-VOUT=2V, IOUT=10mA, TJ =25°C
VIN-VOUT=1.4 to 10V
1.238
1.262
Reference Voltage
Line Regulation
Load Regulation
VREF LD1117 : IOUT=10 ~ 800mA
LD1117A : IOUT=10 ~ 1000mA
ΔVOUT VIN-VOUT=1.5 to 13.75V, IOUT=10mA
VIN-VOUT=3V
ΔVOUT LD1117 : IOUT=10 ~ 800mA
LD1117A : IOUT=10 ~ 1000mA
ΔVOUT
1.225
1.275
0.200
0.400
V
%
%
0.035
0.10
Temperature stability
Long Term Stability
0.50
0.3
%
%
V
ΔVOUT 1000 hrs, TJ =125°C
VIN
Operating Input Voltage
Adjustment Pin Current
15
IADJ
VIN≤15V
60
1
120
μA
VIN-VOUT=1.4 to 10V,
Adjustment Pin Current Change
ΔIADJ LD1117 : IOUT=10 ~ 800mA
LD1117A : IOUT=10 ~ 1000mA
IO(MIN) VIN=15V
5
5
μA
Minimum Load Current
Current Limit
2
mA
mA
%
LD1117
800
ILIMIT VIN-VOUT=5V, TJ =25°C
LD1117A 1000
Output Noise (%Vo)
Supply Voltage Rejection
eN
B=10Hz to 10KHz, TJ =25°C
0.003
75
I
OUT=40mA, f=120Hz, TJ =25°C,
SVR
60
dB
VIN-VOUT=3V, Vripple=1Vpp
IOUT=100mA
1.00
1.15
1.20
1.20
0.01
1.10
1.25
1.30
1.30
0.10
V
V
V
I
I
I
OUT=500mA
OUT=800mA
OUT=1000mA
Dropout Voltage
VD
V
Thermal Regulation
Ta=25°C, 30ms Pulse
%/W
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
SOT-223
SOP-8
15
20
12
4
Thermal Resistance Junction-Case
θJC
°C/W
TO-252
TO-220
TO-263
SOT-223
SOP-8
4
165
150
112
54
64
Thermal Resistance Junction-Ambient
θJA
TO-252
TO-220
TO-263
°C/W
UNISONIC TECHNOLOGIES CO., LTD
9 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATIONS
UTC LD1117/A-5.0V
IN
VIN
OUT
+
+
GND
10μF
100μF
VOUT = -5V
Floating Input
FIG.1 Negative Supply
110
110
110
UTC LD1117/A-
18-27
Lines
2.85V
IN
22μF
+
+
GND
4.75V
to
110
10μF
5.25V
FIG.2 Active Terminator for SCSI-2 BUS
FIG.3 Circuit for Increasing Output Voltage
UNISONIC TECHNOLOGIES CO., LTD
10 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
APPLICATION NOTE of LD1117/A ADJUSTABLE
The LD1117/A ADJUSTABLE has a reference voltage of between the OUT and ADJ pins. IADJ is 60μA typ.
(120μA max.) and ΔIADJ is 1μA typ. (5μA max.).
R1 is normally fixed to 120Ω.
From figure 4 we obtain:
VOUT=VREF+R2(IADJ + IR1)=VREF + R2(IADJ + VREF / R1)=VREF(1+R2/R1) + R2 x IADJ.
Usually R2 value is in the range of few KΩ, so the R2 X IADJ product could be neglected; then the above
expression becomes: VOUT=VREF(1+R2/R1)
For better load regulation, realize a good Kelvin connection of R1 and R2 is important. Particularly R1
connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be placed as
near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10μF electrolytic
capacitor placed in parallel to the R2 resistor (See Fig. 5)
UTC LD1117/A
VIN
VOUT
IN
OUT
+
+
ADJ
10μF
10μF
R1
120Ω
VREF
R2
FIG.4 Adjustable Output Voltage Application Circuit
FIG.5 Adjustable Output Voltage Application with improved Ripple Rejection.
UNISONIC TECHNOLOGIES CO., LTD
11 of 12
QW-R102-006,Q
www.unisonic.com.tw
LD1117/A
LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
12 of 12
QW-R102-006,Q
www.unisonic.com.tw
相关型号:
©2020 ICPDF网 联系我们和版权申明