6

LT1033

1033fc

C3

C1

D2**

1N4002

D1* 1N4002

R1

R2

ADJ

LT1033

+

+

LT1033 • F02

*D1 PROTECTS THE REGULATOR FROM INPUT SHORTS TO GROUND. IT IS

REQUIRED ONLY WHEN C3 IS LARGER THAN 20

THAN 6V

** D2 PROTECTS THE ADJUST PIN OF THE REGULATOR FROM OUTPUT

SHORTS IF C2 IS LARGER THAN 10

Figure 2

LEAD RESISTANCE HERE DOES

NOT AFFECT LOAD REGULATION

CONNECT R1

DIRECTLY TO

REGULATOR PIN

R1

R2

ADJ

LOAD

LT1033

LT1033 • F03

LEAD RESISTANCE HERE

DEGRADES LOAD

REGULATION. MINIMIZE

THE LENGTH OF THIS LEAD

Figure 3

larger than 10

µF may be used, but if the output is larger

than 25V, a diode, D2, should be added between the output

and adjustment pins (see Figure 2).

Proper Connection of Divider Resistors

The LT1033 has a load regulation specification of 0.8%

and is measured at a point 1/8" from the bottom of the

package. To prevent degradation of load regulation, the

resistors which set output voltage, R1 and R2, must be

connected as shown in Figure 3. Note that the positive side

of the load has a true force and sense (Kelvin) connection,

but the negative side of the load does not.

R1 should be connected

directly to the output lead of the

regulator, as close as possible to the specified point 1/8"

from the case. R2 should be connected to the positive

side of the load separately from the positive (ground)

connection to the raw supply. With this arrangement, load

regulation is degraded only by the resistance between the

regulator output pin and the load. If R1 is connected to the

load, regulation will be degraded.