Fairchild KA431SAMF, KA431SAMF2, KA431SLMF, KA431SLMF2, KA431SMF Schematic [ru]

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KA431S/KA431SA/KA431SL

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 KA431S/KA431SA/KA431SL 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.

SOT-23F

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1 2

MF- 1.Cathode 2. Ref 3. Anode

MF2- 1. Ref 2. Cathode 3. Anode

Internal Block Diagram

REFERENCE

+

CATHODE

-

2.5 Vref

ANODE

CATHODE (K)

REFERENCE (R)

ANODE(A)

Rev. 1.0.6

©2005 Fairchild Semiconductor Corporation

KA431S/KA431SA/KA431SL

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
	Thermal Resistance Junction-Air (Note1,2)	Rθ JA	350	° C/W
	MF Suffix Package
	Power Dissipation (Note3,4)	PD	350	mW
	MF Suffix Package
	Junction Temperature	TJ	150	° C
	Operating Temperature Range	TOPR	-25 ~ +85	° C
	Storage Temperature Range	TSTG	-65 ~ +150	° C

Note :

1. Thermal resistance test board

Size: 76.2mm * 114.3mm * 1.6mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7

2.Assume no ambient airflow.

3.TJMAX = 150° C, Ratings apply to ambient temperature at 25° C

4.Power dissipation calculation: PD = (TJ - TA)/Rθ JA

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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KA431S/KA431SA/KA431SL

Electrical Characteristics

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

Parameter	Symbol	Conditions				KA431S				KA431SA			KA431SL			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	∆ VREF/
Reference		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
	∆ IREF/∆ T	R1=10kΩ		,R2=∞	-					-			-			A
Over Full							0.4		1.2		0.4	1.2		0.4	1.2
		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,														A
Cathode	IKA(OFF)				-		0.05		1.0	-	0.05	1.0	-	0.05	1.0
		VREF=0
Current
Dynamic		VKA=VREF,														Ω
Impedance	ZKA	IKA=1 to 100mA			-		0.15		0.5	-	0.15	0.5	-	0.15	0.5
		f ≥ 1.0kHz

• TMIN = -25° C, TMAX = +85° C

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KA431S/KA431SA/KA431SL

Test Circuits

KA431S

			KA431S
Figure 1. Test Circuit for VKA=VREF			Figure 2. Test Circuit for VKA≥ VREF

KA431S

Figure 3. Test Circuit for lKA(OFF)

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