IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

Datasheet Thumbnail

Top Searches for this datasheet

Data Sheet PD94118
IRU431L IRU431AL
-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION
IRU431L family three-terminal adjustable shunt regulators that also used precision voltage references. output voltage value between VREF(1.24V) with external resistors shown typical application circuit. Other applications this device include being used merged amplifier reference applications such linear regulator secondary side controller voltage power supply applications. IRU431L only requires 80mA maximum quiescent current before regulating, making ideal voltage reference battery type applications. IRU431L initial accuracy while IRU431AL provides 60.5% initial accuracy.
FEATURES
SOT-23 Packages Voltage Reference Initial Accuracy IRU431L 0.5% IRU431AL) Operating Cathode Current (80mA max) Unconditionally Stable with only Adjustable Output from 1.24V 0.25V Typical Output Impedance Compatible with TLV431
APPLICATIONS
Precision Voltage Reference Linear Regulator Controller Secondary Side Controller voltage power supply applications
TYPICAL APPLICATION
VOUT
IRU431L
VREF
Figure Typical application IRU431L shunt regulator voltage reference.
PACKAGE ORDER INFORMATION
(°C) 5-PIN SOT-23 (L5) IRU431LCL5 IRU431ALCL5 3-PIN SOT-23 (L3) IRU431LCL3 IRU431ALCL3
Rev. 02/20/02
www.irf.com
IRU431L IRU431AL
ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous Cathode Current Range Reference Current Range Storage Temperature Range Operating Junction Temperature Range -15mA +15mA -0.05mA -658C 1508C 1508C
PACKAGE INFORMATION
5-PIN SOT-23 (L5)
VIEW
3-PIN SOT-23 (L3)
VIEW Cathode
Cathode
Anode Anode
JA=256°C/W
JA=336°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over TA=0 708C, =1mF. Typical values refer TA=258C. duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER TEST CONDITION IK=10mA, KA=VREF, TA=258C IK=10mA, VKA=VREF IK=10mA, KA=VREF, TA=258C IK=10mA, VKA=VREF VKA=VREF, IK=10mA Note IK=10mA, DVKA=VREF IK=10mA, R1=10KV, R2=open IK=10mA, R1=10KV, R2=open Note VKA=VREF VKA=6V, VREF=0V VKA=10V, VREF=0V VKA=15V, VREF=0V VKA=VREF, f<1KHz, IK=0.1 15mA, Note 1.228 1.221 1.234 1.228 1.240 1.240 1.240 1.240 0.15 0.05 0.25 UNITS 1.252 1.259 1.246 1.252 mV/V
Reference Voltage VREF IRU431L Reference Voltage VREF IRU431AL VREF Deviation over full VREF(DEV) temperature range Ratio VREF change DVREF/DVKA cathode voltage change Reference Current IREF Deviation over full IREF(DEV) temperature range Minimum Cathode Current IK(MIN) State Cathode Current Ioff
Dynamic Impedance
ZKA0
0.75
Note deviation parameters, VREF(DEV) IREF(DEV) defined differences between maximum minimum values obtained over rated temperature range. average full range temperature coefficient reference input voltage defined VREF(DEV) VREF(258C)
Where: ?aVREF? unit ppm/8C rated operating free temperature device. aVREF positive negative depending whether minimum VREF maximum VREF respectively occurs lower temperature.
?aVREF?
www.irf.com
Rev. 02/20/02
IRU431L IRU431AL
Note dynamic impedance when VKA=VREF defined ?ZKA0? DVKA When device operating with external resistors (See figure total dynamic impedance circuit given ?ZKA? ?ZKA0?
DESCRIPTIONS
SOT-23 5-PIN PIN# SOT-23 3-PIN PIN# SYMBOL DESCRIPTION Resistors from Cathode ground form divider that sets output voltage. output shunt regulator. capacitor minimum value must connected from this Anode insure unconditional stability. Ground pin. This must connected lowest potential system other pins must higher potential with respect this pin. These pins connected internally.
Cathode
Anode
BLOCK DIAGRAM
Cathode
1.24V
Anode
Figure Simplified block diagram IRU431L.
Rev. 02/20/02
www.irf.com
IRU431L IRU431AL
APPLICATION INFORMATION
Output Voltage Setting IRU431L programmed voltages range 1.24 with addition external resistors according following formula: VREF IREF example given below properly select biasing resistor. Assuming: VMIN 4.5V VMAX 3.3V 10mA maximum value biasing resistor calculated using following equations: RB(MAX) VMIN IB(MAX) IL(MAX)
IRU431L keeps constant voltage 1.240V between ground pin. placing resistor across these pins constant current flows through adding IREF current into resistor producing voltage equal 1.240 IREF which will added 1.240V output voltage shown above equation. Since input bias current 0.5mA max, adds very small error output voltage most applications ignored. example, typical 3.3V application where R2=1.21KV R1=2KV error IADJ only which about 0.03% nominal point.
IB(MAX) IK(MIN) Where: VMIN Minimum supply voltage IL(MAX) Maximum load current IB(MAX) Maximum bias current IK(MIN) Maximum value minimum cathode current spec Current through Assuming before, 1.24 1.03mA
VOUT
IRU431L
IB(MAX) 0.08 1.03 1.11mA RB(MAX) 108V 1.11
Select 100V Figure Typical application IRU431L programming output voltage. Biasing Resistor (RB) Selection biasing resistor selected such that does limit input current under minimum input supply maximum load biasing current. maximum power dissipation resistor calculated under maximum supply voltage follows: VKA) (MAX)
Where: VMAX Maximum supply voltage (MAX) Maximum power dissipation
(MAX)
3.3) 73mW
www.irf.com
Rev. 02/20/02
IRU431L IRU431AL
Thermal Design IRU431L offered surface mount SOT-23 packages. SOT-23 package maximum power dissipation capability 150mW TA=25°C with derating factor -1.2mW table below summarizes maximum power dissipation capability each package versus ambient temperature. Ambient Temperature (TA)
132mW 120mW 108mW 96mW
SOT-23
Stability IRU431L many different domains stability function cathode current. typical threeterminal shunt regulators, IRU431L many domains stability. actual domain which practical circuit operates related cathode current. general device will unconditionally stable cathode current capacitor, larger, connected between cathode anode. cathode current always higher than under minimum line maximum load conditions, capacitor value reduced 0.01mF system will stable.
150mW
previous example, maximum power dissipation device calculated under load maximum input supply condition. maximum power calculated using following equation: PMAX VMAX
Where: PMAX Maximum power dissipation 431L example: PMAX 89mW shown power dissipation table, both packages handle this power dissipation.
Rev. 02/20/02
www.irf.com
IRU431L IRU431AL
TYPICAL APPLICATION
Figure cost 3.3V 2.7V output.
Desig
Description Shunt Regulator Capacitor Resistor Resistor Resistor Heat Sink
Part Manuf IRU431L Elect,220mF, 6.3V, ECAOJFQ221 Panasonic 6.2KV, 118V, 100V, minimum square copper area load current
WORLD HEADQUARTERS: Kansas St., Segundo, California 90245, Tel: (310) 252-7105 Fax: (310) 252-7903 Visit www.irf.com sales contact information Data specifications subject change without notice. 02/01
www.irf.com
Rev. 02/20/02

IRU431L IRU431AL -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DE

Top Searches for this datasheet

Other recent searches