Fairchild Semiconductor KA78T15TU, KA78T12TU, KA78T12, KA78T05TU, KA78T05 Datasheet

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KA78TXX

3-Terminal 3A Positive Voltage Regulator

Features

•Output current in excess of 3.0A

•Output transistor safe operating area compensation

•Power dissipation :25W

•Internal short circuit current limiting

•Internal thermal overload protection

•Output voltage offered in 4% tolerance

•No external components required

•Output voltage of 5, 12 and 15V

Description

This family of fixed voltage regulators are monolithic integrated circuit capable of driving loads in excess of 3.0 A.

TO-220

1.Input 2. GND 3. Output

Internal Block Diagram

Rev. 1.0.0

KA78TXX

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Input Voltage (for VO = 5V to 12V)	VI	35	V
(for VO = 15V)	VI	40	V
(for VO = 15V)		40	V
Power Dissipation	PD	Internally limited	-

Thermal Resistance, Junction to Air	Rθ JA	65	° C/W
Tc = +25 ° C	Rθ JA	65	° C/W
Tc = +25 ° C
Thermal Resistance ,Junction to Case	Rθ JC	2.5	° C/W

Operating Junction Temperature Range	TJ	0 ~ +150	° C

Storage Temperature Range	TSTG	-65 ~ +150	° C

Electrical Characteristics(KA78T05)

(VI = 10V, IO = 3.0 A, 0 ° C ≤	TJ ≤	+125 ° C, Po ≤ PMAX , unless otherwise specified.)

Parameter	Symbol				Conditions		Min.	Typ.	Max.	Unit
Output Voltage	Vo		5mA ≤	Io ≤	3.0A , TJ = +25 ° C		4.8	5.0	5.2	V
Output Voltage	Vo		7.3V ≤	VI ≤	20V, 5mA ≤ Io ≤ 2.0A		4.75	5.0	5.25	V
			7.3V ≤	VI ≤	20V, 5mA ≤ Io ≤ 2.0A		4.75	5.0	5.25
			7.2V ≤	VI ≤	35V , Io=5mA, TJ =+25 ° C
Line Regulation (Note1)	∆	VO	7.2V ≤	VI ≤	35V , Io=1.0A, TJ = +25 ° C		-	3.0	2.5	mV
Line Regulation (Note1)	∆	VO	7.5V ≤	VI ≤	20V, Io =2.0A		-	3.0	2.5	mV
			7.5V ≤	VI ≤	20V, Io =2.0A
			8.0V ≤	VI ≤	12V, Io =3.0A

Load Regulation (Note1)	∆	VO	5mA ≤	Io ≤	3.0A , TJ = +25 ° C		-	10	30	mV
Load Regulation (Note1)	∆	VO	5mA ≤	Io ≤	3.0A		-	15	80	mV
			5mA ≤	Io ≤	3.0A			15	80	mV
Thermal Regulation	REGT		Pulse =10ms, P = 20W				-	0.002	0.03	%Vo/W
	REGT		TA = +25 ° C				-	0.002	0.03	%Vo/W
			TA = +25 ° C

Quiescent Current	IQ		5mA ≤	Io ≤	3.0A , TJ = +25 ° C		-	3.5	5.0	mA
Quiescent Current	IQ		5mA ≤	Io ≤	3.0A		-	4.0	6.0	mA
			5mA ≤	Io ≤	3.0A			4.0	6.0	mA
	∆	IQ	7.2V ≤	VI ≤	35V, Io = 5mA
Quiescent Current	∆	IQ	TJ = +25 ° C ;				-	0.1	0.8	mA
Quiescent Current			TJ = +25 ° C ;
Change			7.5V ≤	VI ≤	20V, Io =2.0A ;
Change			7.5V ≤	VI ≤	20V, Io =2.0A ;
			5mA ≤	Io ≤	3.0A

Ripple Rejection	RR		f = 120Hz, 8V ≤ VI ≤			18V, Io = 2.0A	-	75	-	dB

Dropout Voltage	VD		Io = 3A ,TJ = +25 ° C				-	2.2	2.5	V

Output Noise Voltage	VN		TA = +25 ° C, 10Hz ≤			f ≤ 100KHz	-	10	-	µ V/Vo
Peak Output Current	IPK		TA = +25 ° C				-	5.0	-	A

Output Resistance	Ro		f = 1.0kHz				-	2.0	-	m Ω

Short Circuit Current Limit	Isc		VI = 35V, TJ =+25 ° C				-	1.5	2.5	A
Average Temperature	∆ VO/∆ T
Coefficient of Output	∆ VO/∆ T		Io = 5.0mA				-	0.2	-	mV/° C
Voltage

Note:

1.Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into account separately. Pulse testing with low duty is used .( PMAX = 25W)

KA78TXX

Electrical Characteristics(KA78T12)

(VI = 19V, IO = 3.0 A, 0 ° C ≤ TJ ≤ +125 ° C, Po ≤ PMAX , unless otherwise specified.)

Parameter	Symbol					Conditions	Min.	Typ.	Max.	Unit
Output Voltage	Vo	5mA ≤		Io ≤	3.0A , TJ =+25 ° C		11.5	12	12.5	V
Output Voltage	Vo	14.5V	≤	VI ≤		27V, 5mA ≤ Io ≤ 2.0A	11.4	12	12.8	V
		14.5V	≤	VI ≤		27V, 5mA ≤ Io ≤ 2.0A	11.4	12	12.8
		14.5V	≤	VI ≤		35V , Io=5mA, TJ =+25 ° C
Line Regulation (Note1)	∆ VO	14.5V	≤	VI ≤		35V , Io=1.0A, TJ =+25 ° C	-	6.0	45	mV
Line Regulation (Note1)	∆ VO	14.9V	≤	VI ≤		28V, Io =2.0A	-	6.0	45	mV
		14.9V	≤	VI ≤		28V, Io =2.0A
		16V ≤	VI ≤		22V, Io =3.0A

Load Regulation (Note1)	∆ VO	5mA ≤		Io ≤	3.0A , TJ =+25 ° C		-	10	30	mV
Load Regulation (Note1)	∆ VO	5mA ≤		Io ≤	3.0A		-	15	80	mV
		5mA ≤		Io ≤	3.0A			15	80	mV
Thermal Regulation	REGT	Pulse =10ms, P = 20W					-	0.002	0.03	%Vo/W
	REGT	TA = +25 ° C					-	0.002	0.03	%Vo/W
		TA = +25 ° C
Quiescent Current	IQ	5mA ≤		Io ≤	3.0A , TJ =+25 ° C		-	3.5	5.0	mA
Quiescent Current	IQ	5mA ≤		Io ≤	3.0A		-	4.0	6.0	mA
		5mA ≤		Io ≤	3.0A			4.0	6.0	mA
Quiescent Current	∆ IQ	14.5V	≤	VI ≤		35V, Io = 5mA
	∆ IQ	TJ =+25 ° C ;					-	0.1	0.8	mA
		TJ =+25 ° C ;
Change		14.9V	≤	VI ≤		27V, Io =2.0A ;
Change		14.9V	≤	VI ≤		27V, Io =2.0A ;
		5mA ≤		Io ≤	3.0A

Ripple Rejection	RR	f = 120Hz, 15V ≤ VI ≤ 25V, Io = 2.0A					57	67	-	dB

Dropout Voltage	VD	Io = 3A ,TJ =+25 ° C					-	2.2	2.5	V
Output Noise Voltage	VN	TA =+25 ° C, 10Hz ≤ f ≤ 100KHz					-	10	-	µ V/Vo
Peak Output Current	IPK	TA =+25 ° C					-	5.0	-	A

Output Resistance	Ro	f = 1.0kHz					-	2.0	-	mΩ

Short Circuit Current Limit	Isc	VI = 35V, TJ =+25 ° C					-	1.5	2.5	A
Average Temperature	∆ VO/∆ T
Coefficient of Output	∆ VO/∆ T	Io = 5.0mA					-	0.5	-	mV/° C
Voltage

Note:

1.Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W)

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