Feature:
Guaranteed 7A peak output current
Guaranteed 5A output current
Adjustable output down to 1.2V
Guaranteed thermal regulation
Current limit constant with temperature
Product Enhancement tested
Output is short-circuit protected
The LM138 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 5A over a
1.2V to 32V output range. They are exceptionally easy to
use and require only 2 resistors to set the output voltage.
Careful circuit design has resulted in outstanding load and
line regulation — comparable to many commercial power
supplies. The LM138 family is supplied in a standard 3-lead
transistor package.
A unique feature of the LM138 family is time-dependent cur-
rent limiting. The current limit circuitry allows peak currents
of up to 12A to be drawn from the regulator for short periods
of time. This allows the LM138 to be used with heavy tran-
sient loads and speeds start-up under full-load conditions.
Under sustained loading conditions, the current limit de-
creases to a safe value protecting the regulator. Also in-
cluded on the chip are thermal overload protection and safe
area protection for the power transistor. Overload protection
remains functional even if the adjustment pin is accidentally
disconnected.
Normally, no capacitors are needed unless the device is situ-
ated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An output capacitor
can be added to improve transient response, while bypass-
ing the adjustment pin will increase the regulator’s ripple rejection.
Besides replacing fixed regulators or discrete designs, the
LM138 is useful in a wide variety of other applications. Since
the regulator is “floating” and sees only the input-to-output
differential voltage, supplies of several hundred volts can be
regulated as long as the maximum input to output differential
is not exceeded, i.e., do not short-circuit output to ground.
The part numbers in the LM138 series which have a K suffix
are packaged in a standard Steel TO-3 package, while those
with a T suffix are packaged in a TO-220 plastic package.
The LM138 is rated for −55C≤TJ≤+150C, and the LM338
is rated for 0C≤TJ≤+125C.
Packaging & Delivery:
Packaging Detail: New and Original, factory sealed packing, it will be pack in one of these packing type: Tube, Tray, Tape and Reel, Tape and Box, Bulk packing, Bag and etc. Please kindly contact us for more details.
Delivery Detail: In stock, shipping by DHL, TNT, FedEx or EMS.
Payment Terms:
T/T, Western Union, PayPal,Cash
Refund & Replacement:
1. If the items you purchase from our store are not of perfected quality, that is they don't work electronically to manufacturers specifications, simply return them to us for replacement or refund.
2. If the items are defective, please notify us within 3 days of delivery.
3. Any items must be returned in their original condition to qualify for a refund or replacement.
4. The buyer is responsible for all the shipping cost incurred.
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Main Products: IC ,Diode ,Capacitor ,Resistor ,Transistor
Business Type: Trading Company,Agent,Distributor/Wholesaler
Shenzhen Guangdong China
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