Fairchild Semiconductor KA3S0765RF-YDTU, KA3S0765RF-TU, KA3S0765R-YDTU, KA3S0765R-TU Datasheet

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KA3S0765R/KA3S0765RF

Fairchild Power Switch(SPS)

Features		Description
• Wide operatimg frequency range up to (150kHz)		The SPS product family is specially designed for an offline
• Pulse by pulse over current limiting		SMPS with minimal external components. The SPS consist
•	Over load protection	of high voltage power SenseFET and current mode PWM
• Over voltage protecton (Min. 23V)		IC. Included control IC features a trimmed oscillator, under
• Internal thermal shutdown function		voltage lock-out, leading edge blanking, optimized gate turn-
•	Under voltage lockout	on/turn-off driver, thermal shut down protection, over volt-
• Internal high voltage sense FET		age protection, temperature compensated precision current
•	External sync terminal	sources for loop compensation and fault protection circuit.
•	Auto Restart Mode	Compared to discrete MOSFET and controller or RCC
		switching converter solution, a SPS can reduce total compo-
		nent count, design size, weight and at the same time increase
		& efficiency, productivity, and system reliabilit. It has a
		basic platform well suited for cost-effective C-TV power
		supply.
		TO-3P-5L	TO-3PF-5L
		1	1
		1. DRAIN 2. GND 3. Vcc 4. FB 5. Sync

Internal Block Diagram

#3 VCC
32V						5V		Internal	#1 DRAIN
						Vref		bias	SFET
							Good
#5 Sync			−				logic
						OSC
5V		+
							S
					6.4V			Q
							R
#4 FB			2.5R			−	L.E.B
2µ A	1mA					+
	9V			1R
							0.1V
	+
7.5V	−							S	#2 GND
	+				Thermal S/D			R Q
25V	−		OVER VOLTAGE S/D					Power on reset

Rev.1.0.1

©2001 Fairchild Semiconductor Corporation

KA3S0765R/KA3S0765RF

Absolute Maximum Ratings

	Characteristic	Symbol	Value	Unit
	Maximum drain voltage (1)	VD,MAX	650	V
	Drain-gate voltage (RGS=1MΩ )	VDGR	650	V
	Gate-source (GND) Voltage	VGS	± 30	V
	Drain current pulsed (2)	IDM	28.0	ADC
	Avalanche current	IAS	20	A
	Continuous drain current (TC=25° C)	ID	7.0	ADC
	Continuous drain current (TC=100° C)	ID	5.6	ADC
	Maximum supply voltage	VCC,MAX	30	V
	Input voltage range	VFB	− 0.3 to VSD	V
	Total power dissipation	PD (watt H/S)	140	W
		Derating	1.11	W/° C
	Operating ambient temperature	TA	− 25 to +85	° C
	Storage temperature	TSTG	− 55 to +150	° C

Notes:

1.Tj=25° C to 150° C

2.Repetitive rating: Pulse width limited by maximum junction temperature

3. L=24mH, VDD=50V, RG=25Ω, starting Tj=25 ° C

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KA3S0765R/KA3S0765RF

Electrical Characteristics (SFET part)

(Ta = 25° C unless otherwise specified)

	Characteristic	Symbol	Test condition	Min.	Typ.	Max.	Unit
	Drain-source breakdown voltage	BVDSS	VGS=0V, ID=50 A	650	-	-	V
			VDS=Max., Rating,	-	-	50	A
	Zero gate voltage drain current	IDSS	VGS=0V
			VDS=0.8Max., Rating,	-	-	200	mA
			VGS=0V, TC=125° C
	Static drain-source on resistance (note)	RDS(ON)	VGS=10V, ID=4.0A	-	1.25	1.6	W
	Forward transconductance (note)	gfs	VDS=15V, ID=4.0A	3.0	-	-	S
	Input capacitance	Ciss	VGS=0V, VDS=25V,	-	1600	-	pF
	Output capacitance	Coss		-	310	-
			f=1MHz
	Reverse transfer capacitance	Crss		-	120	-
	Turn on delay time	td(on)	VDD=0.5BVDSS, ID=7.0A	-	25	-	nS
	Rise time	tr	(MOSFET switching	-	55	-
			time are essentially
	Turn off delay time	td(off)		-	80	-
			independent of
			operating temperature)
	Fall time	tf		-	50	-
	Total gate charge	Qg	VGS=10V, ID=7.0A,	-	-	72	nC
	(gate-source+gate-drain)		VDS=0.5BVDSS (MOSFET
			switching time are
	Gate-source charge	Qgs		-	9.3	-
			essentially independent of
	Gate-drain (Miller) charge	Qgd	operating temperature)	-	29.3	-

Note:

Pulse test: Pulse width < 300 S, duty cycle < 2%

S 1

= ---

R

3

KA3S0765R/KA3S0765RF

Electrical Charcteristics (CONTROL part)

(Ta = 25° C unless otherwise specified)

Characteristic		Symbol		Test condition		Min.		Typ.		Max.		Unit
UVLO SECTION
Start threshold voltage		VSTART		-		14		15		16		V
Stop threshold voltage		VSTOP		After turn on		9		10		11		V
OSCILLATOR SECTION
Initial accuracy		FOSC		Ta=25° C		18		20		22		kHz
Frequency change with temperature (2)		∆ F/∆ T		− 25° C≤ Ta≤ +85° C		-		± 5		± 10		%
Maximum duty cycle		Dmax		-		92		95		98		%
FEEDBACK SECTION
Feedback source current		IFB		Ta=25° C, Vfb=GND		0.7		0.9		1.1		mA
Shutdown Feedback voltage		VSD		-		6.9		7.5		8.1		V
Shutdown delay current		Idelay		Ta=25° C, 5V≤ Vfb≤ VSD		1.4		1.8		2.2		µ A
SYNC. & SOFT START SECTION
Soft start voltage		VSS		VFB=2V		4.7		5.0		5.3		V
Soft start current		ISS		Sync & S/S=GND		0.8		1.0		1.2		mA
Sync threshold voltage(3)		VSYTH		Vfb=5V		6.0		6.4		6.8		V
REFERENCE SECTION
Output voltage (1)		Vref		Ta=25° C		4.80		5.00		5.20		V
Temperature Stability (1)(2)		Vref/∆ T		− 25° C≤ Ta≤ +85° C		-		0.3		0.6		mV/° C
CURRENT LIMIT (SELF-PROTECTION)		SECTION
Peak Current Limit		IOVER		Max. inductor current		4.40		5.00		5.60		A
PROTECTION SECTION
Thermal shutdown temperature (Tj) (1)		TSD		-		140		160		-		° C
Over voltage protection voltage		VOVP		-		23		25		28		V
TOTAL DEVICE SECTION
Start Up current		ISTART		VCC=14V		0.1		0.3		0.55		mA
Operating supply current		IOP		Ta=25° C		6		12		18		mA
(control part only)
VCC zener voltage		VZ		ICC=20mA		30		32.5		35		V

NOTE:

1.These parameters, although guaranteed, are not 100% tested in production

2.These parameters, although guaranteed, are tested in EDS(water test) process

3.The amplitude of the sync. pulse is recommended to be between 2V and 3V for stable sync. function.

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KA3S0765R/KA3S0765RF

Typical Performance Characteristics

(These characteristic graphs are normalized at Ta = 25° C)

Fig.1 Operating Frequency

	1.2
1.15
	1.1
1.05
Fosc	1
0.95
	0.9
0.85
	0.8
	-25	0	25	50	75	100	125	150
			Temperature [° C]

Figure 1. Operating Frequency

Fig.3 Operating Current

	1.2
1.15
	1.1
1.05
Iop	1
0.95
	0.9
0.85
	0.8
	-25	0	25	50	75	100	125	150
			Temperature [° C]

Figure 3. Operating Supply Current

	1.2		Fig.2 Feedback Source Current
1.15
	1.1
1.05
Ifb		1
IFB
0.95
	0.9
0.85
	0.8
		-25	0	25	50	75	100	125	150
				Temperature [° C]

Figure 2. Feedback Source Current

Fig.4 Max Inductor Current

1.1
1.05
IIpoveakr 1
0.95
0.9
0.85
0.8
-25	0	25	50	75	100	125	150
		Temperature [° C]

Figure 4. Peak Current Limit

Fig.5 Start up Current

1.5
1.3
IstartST 1.1
0.9
0.7
0.5
-25	0	25	50	75	100	125	150
		Temperature [° C]

Figure 5. Start up Current

Fig.6 Start Threshold Voltage

1.15
	1.1
1.05
Vth(H)	1
start
0.95
	0.9
0.85
	-25	0	25	50	75	100	125	150
			Temperature [° C]

Figure 6. Start Threshold Voltage

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