Fairchild Semiconductor KA431Z, KA431LZ, KA431LD, KA431D, KA431AZ Datasheet

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KA431/KA431A/KA431L

Programmable Shunt Regulator

Features

•Programmable Output Voltage to 36 Volts

•Low Dynamic Output Impedance 0.20 Typical

•Sink Current Capability of 1.0 to 100mA

•Equivalent Full-Range Temperature Coefficient of 50ppm/° C Typical

•Temperature Compensated for Operation Over Full Rated Operating Temperature Range

•Low Output Noise Voltage

•Fast Turn-on Response

Description

The KA431/KA431A/KA431L are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2W Active output circuitry provides a very sharp turn on characteristic, making these devices excellent replacement for zener diodes in many applications.

TO-92

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1. Ref 2. Anode 3. Cathode
8-DIP	8-SOP
1	1
1.Cathode 2.3.4.5.7.NC	1.Cathode 2.3.6.7.Anode
6.Anode 8.Ref	4.5.NC 8.Ref

Internal Block Diagram

CATHODE

REFERENCE

2.5 Vref

ANODE

CATHODE (K)

REFERENCE (R)

ANODE(A)

Rev. 1.0.6

©2002 Fairchild Semiconductor Corporation

KA431/KA431A/KA431L

Absolute Maximum Ratings

(Operating temperature range applies unless otherwise specified.)

Parameter	Symbol	Value	Unit
Cathode Voltage	VKA	37	V
Cathode Current Range (Continuous)	IKA	-100 ~ +150	mA
Reference Input Current Range	IREF	0.05 ~ +10	mA
Power Dissipation
D, Z Suffix Package	PD	770	mW
DIP Package		1000	mW
Junction Temperature	TJ	150	° C
Operating Temperature Range	TOPR	-25 ~ +85	° C
Storage Temperature Range	TSTG	-65 ~ +150	° C

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit
Cathode Voltage	VKA	VREF	-	36	V
Cathode Current	IKA	1.0	-	100	mA

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KA431/KA431A/KA431L

Electrical Characteristics

(TA = +25° C, unless otherwise specified)

Parameter	Symbol	Conditions				KA431			KA431A				KA431L				Unit
					Min.	Typ.		Max.	Min.	Typ.	Max.	Min.		Typ.	Max.
Reference Input	VREF	VKA=VREF,			2.450	2.500		2.550	2.470	2.495	2.520	2.482		2.495		2.508	V
Voltage		IKA=10mA
Deviation of
Reference	∆ VREF/	VKA=VREF,
Input Voltage	∆ T	IKA=10mA			-	4.5		17	-	4.5	17	-		4.5		17	mV
Over-		TMIN≤ TA≤ TMAX
Temperature
Ratio of Change	∆ VREF/			∆ VKA=10
in Reference					-	-1.0		- 2.7	-	-1.0	- 2.7	-		-1.0		-2.7
	∆ VKA			V-VREF
Input Voltage		IKA
																	mV/V
to the Change in		=10mA		∆ VKA=36
Cathode					-	-0.5		-2.0	-	-0.5	-2.0	-		-0.5		-2.0
				V-10V
Voltage
Reference Input	IREF	IKA=10mA,			-	1.5		4	-	1.5	4	-		1.5		4		A
Current		R1=10kΩ		,R2=∞
Deviation of
Reference		IKA=10mA,
Input Current					-				-			-
		R1=10kΩ		,R2=∞		0.4		1.2		0.4	1.2			0.4		1.2
Over Full	∆ IREF/∆ T																	A
		TA =Full Range
Temperature
Range
Minimum
Cathode Cur-	IKA(MIN)	VKA=VREF			-	0.45		1.0	-	0.45	1.0	-		0.45		1.0	mA
rent for
Regulation
Off - Stage		VKA=36V,
Cathode	IKA(OFF)				-	0.05		1.0	-	0.05	1.0	-		0.05		1.0		A
		VREF=0
Current
Dynamic		VKA=VREF,
Impedance	ZKA	IKA=1 to 100mA			-	0.15		0.5	-	0.15	0.5	-		0.15		0.5	Ω
		f ≥ 1.0kHz

• TMIN = -25° C, TMAX = +85° C

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KA431/KA431A/KA431L

Test Circuits

Figure 1. Test Circuit for VKA=VREF

Figure 2. Test Circuit for VKA≥ VREF

Figure 3. Test Circuit for lKA(OFF)

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