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FIGURE 7 – BASIC RH1084 POSITIVE ADJUSTABLE REGULATOR APPLICATION

VRG8653/54

VIN

Vout

ADJ

VREF

22µF

Tant.

IADJ = 55µA

VREF = 1.25V,

+Reg = VOUT = VREF (1+R2/R1) + (IADJ x R2)

(RH1084)

10µF

Tant.

FIGURE 8 – BASIC RH1185 NEGATIVE ADJUSTABLE REGULATOR APPLICATION

R1 & R2 LOCATION & PROPER CONNECTION OF

POSITIVE SENSE LEAD

SETTING OUTPUT VOLTAGE

The RH1185 output voltage is set by two external resistors.

Internal reference voltage is trimmed to

2.37V so that a standard 1% 2.37k resistor (R1) can be

used to set divider current at 1mA. R2 is then selected

from:

for R1 = 2.37k and VREF = 2.37V, this reduces to:

R2 =

10 -3

OUT – 2.37

suggested values of 1% resistors are shown.

VOUT

R2 WHEN R1 = 2.37k

130

930

2.5V

3.3V

2.67k

R2 =

(VOUT – 2.37) R1

VREF

–

2.37k

REF

GND

VOUT

RH1185

RLIM

–

VIN

VOUT

LOAD

PARASITIC

LEAD RESISTANCES

– rb +

IGND

*R1 SHOULD BE CONNECTED DIRECTLY TO GROUND LEAD, NOT TO THE LOAD,

SO THAT ra ≈ 0Ω. THIS LIMITS THE OUTPUT VOLTAGE ERROR TO (IGND)(rb).

ERRORS CREATED BY ra ARE MULTIPLIED BY (1 + R2/R1). NOTE THAT VOUT

INCREASES WITH INCREASING GROUND PIN CURRENT. R2 SHOULD BE CONNECTED

DIRECTLY TO LOAD FOR REMOTE SENSING. C1 = C2 > 2µF Tantalum.

VRG8653/54

(RH1185)

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