|
Details, datasheet, quote on part number:LM337T
| |
Datasheet text preview:
www.fairchildsemi.com
LM337
3-Ter minal 1.5A Negative Adjustable Regulator
Features
· · · · · · · Output current in excess of 1.5A Output voltage adjustable between -1.2V and - 37V Internal thermal overload protection Internal short circuit current limiting Output transistor safe area compensation Floating operation for high voltage applications Standard 3-pin TO-220 package
Description
The LM337 is a 3-terminal negative adjustable regulator. It supplies in excess of 1.5A over an output voltage range of -1.2V to - 37V. This regulator requires only two external resistor to set the output voltage. Included on the chip are current limiting, thermal overload protection and safe area compensation.
TO-220
1
1. Adj 2. Input 3. Output
Internal Block Diagram
Vadj
1
3
Output
Voltage Reference
+
Protection Circuitry
2 Input
Rev. 1.0.0
©2001 Fairchild Semiconductor Corporation
LM337
Absolute Maximum Ratings
Parameter Input-Output Voltage Differential Power Dissipation Operating Temperature Range Storage Temperature Range Symbol |VI - VO| PD TOPR TSTG Value 40 Internally limited 0 ~ +125 -65 ~+125 Unit V W °C °C
Electrical Characteristics
(VI - VO = 5V, IO = 40mA, 0°C TJ +125°C, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note1) Load Regulation (Note1) Adjustable Pin Current Adjustable Pin Current Change Symbol Rline Rload IADJ IADJ Conditions TA = +25°C 3V I VI - VO I 40V 3V I VI - VO I 40V TA = +25°C 10mA IO 0.5A 10mA IO 1.5A TA =+ 25°C 10mA IO 1.5A 3V I VI - VO I 40V TA =+ 25°C Reference Voltage Temperature Stability Minimum Load Current to Maintain Regulation Output Noise Ripple Rejection Ratio Long Term Stability Thermal Resistance Junction to Case VREF STT IL(MIN) eN RR ST RJC 3V I VI - VO I 40V 10mA IO 1.5A 0°C J +125°C 3V I VI - VO I 40V 3V I VI - VO I 10V TA =+25°C 10Hz f 10KHz VO = -10V, f = 120Hz CADJ = 10µF (Note2) TJ = 125°C ,1000Hours Min - 1.213 - 1 .200 66 Typ. 0.01 0.02 15 15 50 2 -1.250 -1.250 0 .6 2.5 1.5 0.003 60 77 0.3 4 Max. 0.04 0.07 50 mV 150 100 5 -1.287 -1.300 10 6 1 dB % °C/ W mA V /10 6 V % µA µA Unit %/ V
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2. CADJ, when used, is connected detween the adjustment pin and ground.
2
LM337
Typical Application
I P R OG R2 Ci 0. 1µF µ -VI + Iad j
V adj
+ R1
Vo
Co 1µF -Vo
VI
KA337 LM337
Figure 1. Programmable Regulator
· Ci is required if regulator is located more then 4 inches from power supply filter. A 1.0µF solid tantalum or 10µF aluminum electrolytic is recommended. Co is necessary for stability. A 1.0µF solid tantalum or 10µF aluminum electrolytic is recommended. · VO= -1.25V (1+R2/R1)
3
|
|
