View LM350T_1107588.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LM350 3.0 A, Adjustable Output, Positive Voltage Regulator
The LM350 is an adjustable three-terminal positive voltage regulator capable of supplying in excess of 3.0 A over an output voltage range of 1.2 V to 33 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. The LM350 serves a wide variety of applications including local, on card regulation. This device also makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM350 can be used as a precision current regulator.
Features http://onsemi.com
THREE-TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
* * * * * * * * * * *
Guaranteed 3.0 A Output Current Output Adjustable between 1.2 V and 33 V Load Regulation Typically 0.1% Line Regulation Typically 0.005%/V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe Area Compensation Floating Operation for High Voltage Applications Standard 3-lead Transistor Package Eliminates Stocking Many Fixed Voltages Pb-Free Packages are Available*
Vin vout R1 240 Adjust + C ** O 1mF
TO-220 T SUFFIX PLASTIC PACKAGE CASE 221AB
1
2
3
Pin 1. Adjust 2. Vout 3. Vin
Heatsink surface is connected to Pin 2.
MARKING DIAGRAM
LM350
LM 350T AWLYWWG
IAdj Cin* 0.1mF
R2
A WL Y WW G
= Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Device
* = Cin is required if regulator is located an appreciable distance from power supply filter. ** = CO is not needed for stability, however, it does improve transient response. R Vout + 1.25 V 1 ) 2 ) IAdj R2 R1 Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 3 of this data sheet.
Figure 1. Simplified Application
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
(c) Semiconductor Components Industries, LLC, 2006
1
August, 2006 - Rev. 4
Publication Order Number: LM350/D
LM350
MAXIMUM RATINGS
Rating Input-Output Voltage Differential Power Dissipation Operating Junction Temperature Range Storage Temperature Range Soldering Lead Temperature (10 seconds) Symbol VI-VO PD TJ Tstg Tsolder Value 35 Internally Limited -40 to +125 -65 to +150 300 Unit Vdc W C C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ELECTRICAL CHARACTERISTICS (VI-VO = 5.0 V; IL = 1.5 A; TJ = Tlow to Thigh; Pmax [Note 1], unless otherwise noted.)
Characteristics Line Regulation (Note 2) TA = 25C, 3.0 V VI-VO 35 V Load Regulation (Note 2) TA = 25C, 10 mA Il 3.0 A VO 5.0 V VO 5.0 V Thermal Regulation, Pulse = 20 ms, (TA = +25C) Adjustment Pin Current Adjustment Pin Current Change 3.0 V VI-VO 35 V 10 mA IL 3.0 A, PD Pmax Reference Voltage 3.0 V VI-VO 35 V 10 mA IO 3.0 A, PD Pmax Line Regulation (Note 2) 3.0 V VI-VO 35 V Load Regulation (Note 2) 10 mA IL 3.0 A VO 5.0 V VO 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (VI-VO = 35 V) Maximum Output Current VI-VO 10 V, PD Pmax VI-VO = 30 V, PD Pmax, TA = 25C RMS Noise, % of VO TA= 25C, 10 Hz f 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 3) Without CAdj CAdj = 10 mF Long Term Stability, TJ = Thigh (Note 4) TA= 25C for Endpoint Measurements Thermal Resistance, Junction-to-Case Peak (Note 5) Average (Note 6) 4 3 1,2 Figure 1 2 Symbol Regline Regload - - Regtherm IAdj DIAdj - - - 5.0 0.1 0.002 50 0.2 25 0.5 - 100 5.0 mV % VO % VO/W mA mA Min - Typ 0.0005 Max 0.03 Unit %/V
3
Vref
1.20
1.25
1.30
V
1 2
Regline Regload
-
0.02
0.07
%/V
- - 3 3 3 TS ILmin Imax 3.0 0.25 N RR - 66 3 S RqJC - - - - - -
20 0.3 1.0 3.5
70 1.5 - 10
mV % VO % VO mA A
4.5 1.0 0.003
- - - % VO dB
65 80 0.3
- - 1.0 %/1.0 k Hrs. C/W
2.3 -
- 1.5
1. Tlow to Thigh = 0 to +125C; Pmax = 25 W for LM350T; Tlow to Thigh = - 40 to +125C; Pmax = 25 W for LM350BT 2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 3. CAdj, when used, is connected between the adjustment pin and ground. 4. Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 5. Thermal Resistance evaluated measuring the hottest temperature on the die using an infrared scanner. This method of evaluation yields very accurate thermal resistance values which are conservative when compared to the other measurement techniques. 6. The average die temperature is used to derive the value of thermal resistance junction to case (average).
http://onsemi.com
2
LM350
ORDERING INFORMATION
Device LM350T LM350TG TJ = 0 to + 125 C Operating Temperature Range Package TO-220 TO-220 (Pb-Free) Shipping 50 Units / Rail 50 Units / Rail
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
Vin 310 310 230 120 5.6K 6.3V 170 6.7K 12K 5.0pF 6.8K 510 160 200 13K 6.3V
125K
6.3V
135
12.4K
30 pF 3.6K 5.8K 5.1K 110
30 pF
2.4K 12.5K
105 4
190
0.45 Vout Adjust
Figure 2. Representative Schematic Diagram
VCC Line Regulation (%/V) = * VIH VIL Vin LM350 Vout IL
VOH - VOL VOL
x 100 VOH VOL
Adjust Cin 0.1mF IAdj
R1
240 1% CO
RL + 1mF
* Pulse Testing Required: 1% Duty Cycle is suggested.
R2 1%
Figure 3. Line Regulation and DIAdj/Line Test Circuit
http://onsemi.com
3
LM350
Load Regulation (% VO) = VO (min Load) - VO (max Load) VO (min Load) X 100 VO (min Load) VO (max Load)
Load Regulation (mV) = VO (min Load) -VO (max Load) Vin Vin LM350 Vout IL RL (max Load) * + Cin 0.1mF IAdj CO 1.0mF
Adjust
R1
240 1%
RL (min Load)
R2 1% * Pulse Testing Required: 1% Duty Cycle is suggested.
Figure 4. Load Regulation and DIAdj/Load Test Circuit
Vin Vout
LM350
IL
Adjust VI Cin 0.1mF ISET R2 1% R1 IAdj
240 1%
Vref + CO 1.0mF
RL VO
Pulse Testing Required: 1% Duty Cycle is suggested.
To Calculate R2: Vout = ISET R2 + 1.250 V Assume ISET = 5.25 mA
Figure 5. Standard Test Circuit
24V 14V f = 120 Hz Vin LM350 Vout IL Vout = 10 V
Adjust Cin 0.1mF
R1
240 1%
D1 * 1N4002 + CO 1.0mF
RL VO
R2
1.65K 1%
** CAdj
+ 10mF
* D1 Discharges CAdj if Output is Shorted to Ground. **CAdj provides an AC ground to the adjust pin.
Figure 6. Ripple Rejection Test Circuit
http://onsemi.com
4
LM350
Vout , OUTPUT VOLTAGE CHANGE (%)
0.4 I out , OUTPUT CURRENT (A) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -75 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 Vin = 15 V Vout = 10 V IL = 1.5 A IL = 0.5 A
7 TJ = 55C 5 TJ = 25C TJ = 150C
3
1 0 0 10 20 30 Vin-Vout, INPUT VOLTAGE DIFFERENTIAL (Vdc) 40
Figure 7. Load Regulation
Figure 8. Current Limit
3.0 IAdj, ADJUSTMENT PIN CURRENT (A) 70 65 60 55 50 45 40 35 -75 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 V in -Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
DV0 = 100 mV IL = 3.0 A IL = 2.0 A
2.5
2.0 IL = 500 mA 1.5 IL = 20 mA 1.0 -75 -50 -25 IL = 200 mA 150
0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C)
Figure 9. Adjustment Pin Current
Figure 10. Dropout Voltage
1.260 Vref , REFERENCE VOLTAGE (V) IB , QUIESCENT CURRENT (mA)
5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 TJ = -55C TJ = 25C TJ = 150C
1.250
1.240
1.230
1.220 -75
-50
-25
0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C)
150
0
10 20 30 40 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 11. Temperature Stability
Figure 12. Minimum Operating Current
http://onsemi.com
5
LM350
100 CAdj = 10 mF RR, RIPPLE REJECTION (dB) 80 60 40 20 0 Without CAdj RR, RIPPLE REJECTION (dB) 140 120 100 80 60 40 20 35 0 0.01 Vin - Vout = 5 V IL = 500 mA f = 120 Hz TJ = 25C 0.1 1 Iout, OUTPUT CURRENT (A) 10 CAdj = 10 mF Without CAdj
Vin - Vout = 5 V IL = 500 mA f = 120 Hz TJ = 25C 0 5 10 15 20 25 30 Vout, OUTPUT VOLTAGE (V)
Figure 13. Ripple Rejection versus Output Voltage
Figure 14. Ripple Rejection versus Output Current
100 RR, RIPPLE REJECTION (dB) 80 60 40 CAdj = 10 mF 20 0 10 Without CAdj IL = 500 mA Vin = 15 V Vout = 10 V TJ = 25C Z O , OUTPUT IMPEDANCE ( )
101 Vin = 15 V Vout = 10 V IL = 500 mA TJ = 25C
100
10-1 Without CAdj 10-2 CAdj = 10 mF 10-3
100
1.0 k
10 k 100 k 1.0 M f, FREQUENCY (Hz)
10 M
10
100
1.0 k 10 k f, FREQUENCY (Hz)
100 k
1.0 M
Figure 15. Ripple Rejection versus Frequency
Figure 16. Output Impedance
Vout , OUTPUT VOLTAGE DEVIATION (V)
Vout , OUTPUT VOLTAGE DEVIATION (V)
3 2 1 0 -1 -2 -3 CL = 0; Without CAdj Vin = 15 V Vout = 10 V INL = 50 mA TJ = 25C CL = 1.0 mF; CAdj = 10 mF
1.5 1.0 0.5 0 -0.5 -1.0 -1.5 1.0 0.5 0 0 10 20 t, TIME (ms) Vin 30 40 Vout = 10 V IL = 50 mA TJ = 25C CL = 1.0 mF; CAdj = 10 mF
Vin , INPUT VOLTAGE CHANGE (V)
I L , LOAD CURRENT (A)
CL = 0; Without CAdj
1.5 1.0 0.5 0 0 10 20 t, TIME (ms) IL 30 40
Figure 17. Line Transient Response
Figure 18. Load Transient Response
http://onsemi.com
6
LM350
APPLICATIONS INFORMATION
Basic Circuit Operation External Capacitors
The LM350 is a three-terminal floating regulator. In operation, the LM350 develops and maintains a nominal 1.25 V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current (IPROG) by R1 (see Figure 19), and this constant current flows through R2 to ground. The regulated output voltage is given by:
Vout = Vref (1 + R2 ) + IAdj R2 R1
Since the current from the terminal (IAdj) represents an error term in the equation, the LM350 was designed to control IAdj to less than 100 mA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the LM350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible.
Vin LM350 Vout + R1 Adjust Vref IPROG Vout IAdj R2
A 0.1 mF disc or 1 mF tantalum input bypass capacitor (Cin) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (CAdj) prevents ripple from being amplified as the output voltage is increased. A 10 mF capacitor should improve ripple rejection about 15 dB at 120 Hz in a 10 V application. Although the LM350 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (CO) in the form of a 1 mF tantalum or 25 mF aluminum electrolytic capacitor on the output swamps this effect and insures stability.
Protection Diodes
When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 18 shows the LM350 with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 25 mF, CAdj > 10 mF). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CAdj discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CAdj from discharging through the IC during an input short circuit.
D1 1N4002 Vin LM350 Cin Adjust R2 CAdj Vout +
Vref = 1.25 V Typical
Figure 19. Basic Circuit Configuration Load Regulation
R1
The LM350 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation.
D2
CO
1N4002
Figure 20. Voltage Regulator with Protection Diodes
http://onsemi.com
7
LM350
D6 1N4002 Vin 32V LM350 (1) Vout1 RSC Vin2 LM350 (2) Vout 2 240 Adjust 1 Current Limit Adjust 1K D1 1N4001 1N4001 D2 5.0K Adjust 2 Voltage Adjust 1N4001 D3 D4 -10V Diodes D1 and D2 and transistor Q2 are added to allow adjustment of output voltage to 0 V. D6 protects both LM350's during an input short circuit. Q2 2N5640 1N4001 Output Range: 0 VO 25 V 0 IO 1.5 A D5 IN4001 + 10mF IO VO + 1.0mF Tantalum
Vin1 0.1mF
Q1 2N3822
-10V
Figure 21. "Laboratory" Power Supply with Adjustable Current Limit and Output Voltage
+25V Vin
LM350
Vout
R1 620
Vout
Iout D1 D1 1N4001 D2 1N4001 1N4002 Vin LM350 Vout + 120 Adjust MPS2222 720 1.0k TTL Control 1.0mF
Adjust * To provide current limiting of IO to the system ground, the source of the FET must be tied to a negative voltage below -1.25 V. Vref R2 IDSS Vref R1 = IOmax + IDSS VO < V(BR)DSS + 1.25 V + VSS ILmin - IDSS < IO < 3.0 A As shown O < IO < 1.0 A
R2 100
2N5640
VSS*
Minimum Vout = 1.25 V D1 protects the device during an input short circuit.
Figure 22. Adjustable Current Limiter
Figure 23. 5.0 V Electronic Shutdown Regulator
Vin Vin LM350 Vout 240 Adjust R2 MPS2907 50k + 10mF 1N4001 Adjust LM350
Vout
R1
Iout
IAdj Iout + Vref ) IAdj R1
^ 1.25 V R1 10 mA Iout 3.0 A
Figure 24. Slow Turn-On Regulator
Figure 25. Current Regulator
http://onsemi.com
8
LM350
PACKAGE DIMENSIONS
TO-220, SINGLE GAUGE T SUFFIX CASE 221AB-01 ISSUE O
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 A B C D F G H J K L N Q R S T U V Z INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.020 0.055 0.235 0.255 0.000 0.050 0.045 --- --- 0.080 MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 0.508 1.39 5.97 6.47 0.00 1.27 1.15 --- --- 2.04
-T- B
4
SEATING PLANE
F T S
C
Q
123
A U K
H Z L V G D N R J
http://onsemi.com
9
LM350
ON Semiconductor and are registered 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. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
http://onsemi.com
10
LM350/D

▲Up To Search▲

Price & Availability of LM350T

	To Download LM350T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .