<Linear IC>

RT9H321C
Adjustable Precision Shunt Regulator

PIN CONFIGURATION ［UNIT：mm］

The RT9H321C is adjustable shuntregulator, which provides a highly accurate 1.0%. Output voltage can be set toany value between VREF and 36V with two external resistors.

1.1● Reference voltage : VREF=1.250V±1%(Ta=25℃)● Adjustable output voltage : VREF to 36V● Low output impedance : |ZKA|=0.25Ω(Typ.)● Small package : SC-59

0.33②③0～0.1

APPLICATION

0.5

①0.8

2.9
1.90
0.95 0.95

FEATURE

2.5
1.50.50.16

DESCRIPTION●Source of reference voltage, such as a general electric device●Secondary side control of a switching power supply

Outline : SC-59①Reference voltage(VREF)②Cathode(K)③Anode(A)BLOCK DIAGRAM

K

VREF
1.25V

A

211029

<Linear IC>

RT9H321C
Adjustable Precision Shunt Regulator
ABSOLUTE MAXIMUM RATINGS ( Ta=25℃, unless otherwise noted )SymbolParameter
VKA
Cathode voltage
IK
Cathode current
IREF
Reference input current
Tj0PT
Operating junction temperature ( Non condensing )TSTG
Storage temperature
Pd
Power dissipation

Ratings
37-80～80-0.05～10-40～+150-55～＋150200

Unit
VmA
mA℃℃
mW

RECOMMENDED OPERATING CONDITIONS ( Ta=25℃, unless otherwise noted )LimitsSymbolParameter
Unit
Min.
Max.
VKA
Cathode voltage
VREF
36Ｖ
ＩＫ
Cathode current
0.2
80mA

ELECTRICAL CHARACTERISTICS ( Ta=25℃, unless otherwise noted )SymbolParameter

Test condition

Min.

Limits
Typ.

Max.

1.237

1.250

1.236

Ｖ

30

mV

Unit

Reference voltage

VKA=VREF，IK=1mA⊿ＶＲＥＦ/⊿Ｔａ

Deviation of reference input
voltage over temperature

VKA=VREF，IK=1mA，Ta=-20～85℃--Ratio of VREF change in cathodevoltage change⊿VKA=VREF～5V，IK=1mA-2.7-1.4-mV/V⊿ＶＲＥＦ/⊿VK⊿VKA=5V～36V，IK=1mA-2-1-mV/V

VREF

Reference input current

IK=10mA,R1=10K，R2=∞

-0.2

0.5uA

⊿ＩＲＥＦ/⊿Ta

Deviation of reference input current
over temperature

IK=10mA,R1=10K，R2=∞, Ta=-20～85℃

-

0.1

0.5uA

Ikmin

Minimum cathode current forregulation

VKA=VREF

-0.08

0.20

mA

IOFF

Off-state cathode current

VKA=28V，VREF=0V

-0.1

1.0uA

|ZKA|

Dynamic impedance

VKA=VREF,IK=0.5～80mA，f<1.0KHz

-0.25

0.50

Ω

IREF

211029

<Linear IC>

RT9H321C
Adjustable Precision Shunt Regulator

PARAMETER MEASUREMENT INFORMATION(2)VKA＞VREF(1)VKA=VREF
VO=VKAVIN

VO=VKA

VIN

K

R1 IRE

A

R2

VRE

K

VREF
A

VO=(1+R1/R2)・(3)IOFF
VO=VKA

VIN
K
VREF
A

211029

<Linear IC>

RT9H321C
Adjustable Precision Shunt Regulator
Pd-Ta

VREF-Tj

IK-VKA （1）IK-VKA （2）⊿VREF-VKA

IREF-Tj

211029

<Linear IC>

RT9H321C
Adjustable Precision Shunt Regulator
IOFF-Tj|ZKA|-fPulse response

Av-f

Stability boundary conditions

A:VKA=VREF
B:VKA=2.5V
C:VKA=5V
D:VKA=10V
Cathode voltage temperature Ta=25℃
IKA=10mA CL=:Ceramic capacitor

211029

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Oct.2021