Texas Instruments TL1451AQDR, TL1451AQD, TL1451AMJB, TL1451AMJ, TL1451AMFKB Datasheet

TL1451A DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

DComplete PWM Power Control Circuitry

DCompletely Synchronized Operation

DInternal Undervoltage Lockout Protection

DWide Supply Voltage Range

DInternal Short-Circuit Protection

DOscillator Frequency . . . 500 kHz Max

DVariable Dead Time Provides Control Over Total Range

DInternal Regulator Provides a Stable 2.5-V Reference Supply

DAvailable in Q-Temp Automotive

HighRel Automotive Applications Configuration Control / Print Support Qualification to Automotive Standards

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

D, DB, N, NS, PW, OR J PACKAGE

(TOP VIEW)

		CT		1		16		REF
		RT		2		15		SCP
ERROR		1IN+		3		14		2IN+			ERROR
AMPLIFIER 1		1IN±		4		13		2IN±			AMPLIFIER 2
1FEEDBACK				5		12		2FEEDBACK
	1DTC			6		11		2DTC
	1OUT			7		10		2OUT
		GND		8		9		VCC
			FK PACKAGE
				(TOP VIEW)
		RT		CT	NC	REF		SCP

description

The TL1451A incorporates on a single monolithic chip all the functions required in the construction of two pulse-width-modulation (PWM) control circuits. Designed primarily for power-supply control, the TL1451A contains an on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common-emitter output transistor circuits.

	3	2	1	20	19
1IN+	4				18	2IN+
1IN±	5				17	2IN±
NC	6				16	NC
1FEEDBACK	7				15	2FEEDBACK
IDTC	8				14	2DTC
	9	10	11	12	13
	1OUT	GND	NC	CC	2OUT
				V

The uncommitted output transistors provide common-emitter output capability for each

controller. The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The on-chip oscillator can be operated by terminating RT and CT. During low VCC conditions, the undervoltage lockout control circuit feature locks the outputs off until the internal circuitry is operational.

The TL1451AC is characterized for operation from ±20°C to 85°C. The TL1451AQ is characterized for operation from ±40°C to 125°C. The TL1451AM is characterized for operation from ±55°C to 125°C.

AVAILABLE OPTIONS

				PACKAGED DEVICES
	TA	SMALL	SMALL	PLASTIC DIP	SMALL	TSSOP	CHIP	CERAMIC
		OUTLINE	OUTLINE		OUTLINE		CARRIER	DIP
				(N)		(PW)²
		(D)	(DB)²		(NS)		(FK)	(J)
	± 20°C to 85°C	Ð	TL1451ACDB	TL1451ACN	TL1451ACNS	TL1451ACPW	Ð	Ð
	± 40°C to 125°C	TL1451AQD	Ð	Ð	Ð	Ð	Ð	Ð
	± 55°C to 125°C	Ð	Ð	Ð	Ð	Ð	TL1451AMFK	TL1451AMJ

² The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright 1999, Texas Instruments Incorporated

On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

functional block diagram

				VCC RT		CT
2 DTC		11		9	2	1
ERROR	IN +	14	+				10 2 OUTPUT
AMPLIFIER 2	IN ±	13	±
		12
2 FEEDBACK			1/2 Vref		Oscillator		PWM
		5					COMP
1 FEEDBACK
			12 kΩ	Reference			16	REF
	SCP	15		Voltage
			170 kΩ	R		UVLO
						R
				S
ERROR	IN +	3	+				7 1 OUTPUT
AMPLIFIER 1	IN ±	4	±
							PWM
							COMP
1 DTC		6					8
								GND

COMPONENT COUNT

Resistors	65
Capacitors	8
Transistors	105
JFETs	18

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

	TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
	SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999
absolute maximum ratings over operating free-air temperature range²
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 V
Amplifier input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Collector output voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 V
Collector output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 mA
Continuous power total dissipation . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA C suffix . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . ±20°C to 85°C
Q suffix . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . ±40°C to 125°C
M suffix . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . ±55°C to 125°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . ±65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C

²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

	PACKAGE	TA ≤ 25°C	DERATING FACTOR	TA = 70°C	TA = 85°C	TA = 125°C
		POWER RATING	ABOVE TA = 25°C	POWER RATING	POWER RATING	POWER RATING
	D	1088 mW	8.7 mW/°C	696 mW	566 mW	218 mW
	DB	775 mW	6.2 mW/°C	496 mW	403 mW	Ð
	N	1000 mW	8.0 mW/°C	640 mW	520 mW	Ð
	NS	500 mW	4.0 mW/°C	320 mW	260 mW	Ð
	PW	838 mW	6.7 mW/°C	536 mW	436 mW	168 mW
	FK	1375 mW	11.0 mW/°C	880 mW	715 mW	275 mW
	J	1375 mW	11.0 mW/°C	880 mW	715 mW	275 mW

recommended operating conditions

		MIN	MAX	UNIT
Supply voltage, VCC		3.6	50	V
Amplifier input voltage, VI		1.05	1.45	V
Collector output voltage, VO			50	V
Collector output current, IO			20	mA
Current into feedback terminal			45	µA
Feedback resistor, RF		100		kΩ
Timing capacitor, CT		150	15000	pF
Timing resistor, RT		5.1	100	kΩ
Oscillator frequency		1	500	kHz
	C suffix	± 20	85
Operating free-air temperature, TA				°C
	Q suffix	± 40	125
	M suffix	± 55	125

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)

reference section

	PARAMETER	TEST CONDITIONS		TL1451AC		UNIT
			MIN	TYP²	MAX
	Output voltage (pin 16)	IO = 1 mA	2.4	2.5	2.6	V
	Output voltage change with temperature	TA = ±20°C to 25°C		± 0.1%	±1%
		TA = 25°C to 85°C		± 0.2%	±1%
	Input voltage regulation	VCC = 3.6 V to 40 V		2	12.5	mV
	Output voltage regulation	IO = 0.1 mA to 1 mA		1	7.5	mV
	Short-circuit output current	VO = 0	3	10	30	mA
	² All typical values are at T = 25°C.
	A
	undervoltage lockout section

	PARAMETER	TEST CONDITIONS	TL1451AC			UNIT
			MIN	TYP²	MAX
	Upper threshold voltage (VCC)			2.72		V
	Lower threshold voltage (VCC)	IO(ref) = 0.1 mA, TA = 25°C		2.6		V
	Hysteresis (VCC)		80	120		mV
	Reset threshold voltage (VCC)		1.5	1.9		V
	² All typical values are at T = 25°C.
	A
	short-circuit protection control section

	PARAMETER	TEST CONDITIONS		TL1451AC			UNIT
				MIN	TYP²	MAX
	Input threshold voltage (SCP)	TA = 25°C		0.65	0.7	0.75	V
	Standby voltage (SCP)	No pullup		140	185	230	mV
	Latched input voltage (SCP)	No pullup			60	120	mV
	Input (source) current	VI = 0.7 V,	TA = 25°C	±10	±15	±20	µA
	Comparator threshold voltage (FEEDBACK)				1.18		V
	² All typical values are at T = 25°C.
	A
	oscillator section

	PARAMETER	TEST CONDITIONS			TL1451C		UNIT
				MIN	TYP²	MAX
	Frequency	CT = 330 pF,	RT = 10 kΩ		200		kHz
	Standard deviation of frequency	CT = 330 pF,	RT = 10 kΩ		10%
	Frequency change with voltage	VCC = 3.6 V to 40 V			1%
	Frequency change with temperature	TA = ±20°C to 25°C			± 0.4%	± 2%
		TA = 25°C to 85°C			± 0.2%	± 2%

² All typical values are at TA = 25°C.

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

dead-time control section

	PARAMETER	TEST CONDITIONS	TL1451AC			UNIT
			MIN	TYP²	MAX
	Input bias current (DTC)				1	µA
	Latch mode (source) current (DTC)	TA = 25°C	± 80	±145		µA
	Latched input voltage (DTC)	IO = 40 µA	2.3			V
	Input threshold voltage at f = 10 kHz (DTC)	Zero duty cycle		2.05	2.25	V
		Maximum duty cycle	1.2	1.45
	² All typical values are at T = 25°C.
	A
	error-amplifier section

	PARAMETER	TEST CONDITIONS			TL1451AC		UNIT
				MIN	TYP²	MAX
	Input offset voltage	VO (FEEDBACK) = 1.25 V				± 6	mV
	Input offset current	VO (FEEDBACK) = 1.25 V				±100	nA
	Input bias current	VO (FEEDBACK) = 1.25 V			160	500	nA
				1.05
	Common-mode input voltage range	VCC = 3.6 V to 40 V		to			V
				1.45
	Open-loop voltage amplification	RF = 200 kΩ		70	80		dB
	Unity-gain bandwidth				1.5		MHz
	Common-mode rejection ratio			60	80		dB
	Positive output voltage swing			Vref ± 0.1			V
	Negative output voltage swing					1	V
	Output (sink) current (FEEDBACK)	VID = ± 0.1 V,	VO = 1.25 V	0.5	1.6		mA
	Output (source) current (FEEDBACK)	VID = 0.1 V,	VO = 1.25 V	± 45	±70		µA
	² All typical values are at T = 25°C.
	A
	output section

	PARAMETER	TEST CONDITIONS	TL1451AC			UNIT
			MIN	TYP²	MAX
	Collector off-state current	VO = 50 V			10	µA
	Output saturation voltage	IO = 10 mA		1.2	2	V
	Short-circuit output current	VO = 6 V		90		mA
	² All typical values are at T = 25°C.
	A
	pwm comparator section

	PARAMETER	TEST CONDITIONS	TL1451AC			UNIT
			MIN	TYP²	MAX
	Input threshold voltage at f = 10 kHz (FEEDBACK)	Zero duty cycle		2.05	2.25	V
		Maximum duty cycle	1.2	1.45
	² All typical values are at T = 25°C.
	A
	total device

PARAMETER	TEST CONDITIONS	TL1451AC			UNIT
		MIN	TYP²	MAX
Standby supply current	Off-state		1.3	1.8	mA
Average supply current	RT = 10 kΩ		1.7	2.4	mA
² All typical values are at T = 25°C.
A

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5

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)

reference section

PARAMETER		TEST CONDITIONS		TL1451AQ, TL1451AM			UNIT
				MIN	TYP²	MAX
Output voltage (pin 16)		IO = 1 mA	TA = 25°C	2.40	2.50	2.60	V
			TA = MIN and 125°C	2.35	2.46	2.65
Output voltage change with temperature					± 0.63% *±4%
			TA = 25°C		2.0	12.5
Input voltage regulation		VCC = 3.6 V to 40 V	TA = 125°C		0.7	15	mV
			TA = MIN		0.3	30
			TA = 25°C		1.0	7.5
Output voltage regulation		IO = 0.1 mA to 1 mA	TA = 125°C		0.3	14	mV
			TA = MIN		0.3	20
Short-circuit output current		VO = 0		3	10	30	mA
*These parameters are not production tested.
² All typical values are at T	= 25°C unless otherwise indicated.
A
undervoltage lockout section

PARAMETER		TEST CONDITIONS		TL1451AQ, TL1451AM			UNIT
				MIN	TYP²	MAX
			TA = 25°C		2.72
Upper threshold voltage (VCC)			TA = 125°C		1.70		V
			TA = MIN		3.15
			TA = 25°C		2.60
Lower threshold voltage (VCC)			TA = 125°C		1.65		V
			TA = MIN		3.09
			TA = 25°C	80	120
Hysteresis (VCC)			TA = 125°C	10	50		mV
			TA = MIN	10	60
			TA = 25°C	1.50
Reset threshold voltage (VCC)			TA = 125°C	0.95			V
			TA = MIN	1.50
² All typical values are at T = 25°C unless otherwise indicated.
A

6	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

short-circuit protection control section

	PARAMETER	TEST CONDITIONS	TL1451AQ, TL1451AM			UNIT
			MIN	TYP²	MAX
		TA = 25°C	650	700	750
	Input threshold voltage (SCP)	TA = 125°C	400	478	550	mV
		TA = MIN	800	880	950
	Standby voltage (SCP)		140	185	230	mV
		TA = 25°C		60	120
	Latched input voltage (SCP)	TA = 125°C		70	120	mV
		TA = MIN		60	120
	Equivalent timing resistance			170		kΩ
	Comparator threshold voltage (FEEDBACK)			1.18		V
	² All typical values are at T = 25°C unless otherwise indicated.
	A
	oscillator section

	PARAMETER	TEST CONDITIONS		TL1451AQ, TL1451AM			UNIT
				MIN	TYP²	MAX
		CT = 330 pF,	TA = 25°C		200
	Frequency		TA = 125°C		195		kHz
		RT = 10 kΩ
			TA = MIN		193
	Standard deviation of frequency	CT = 330 pF,	RT = 10 kΩ		2%
			TA = 25°C		1%
	Frequency change with voltage	VCC = 3.6 V to 40 V	TA = 125°C		1%
			TA = MIN		3%
	Frequency change with temperature				1.37%	*± 10%
	*These parameters are not production tested.
	² All typical values are at T = 25°C unless otherwise indicated.
	A
	dead-time control section

	PARAMETER	TEST CONDITIONS	TL1451AQ, TL1451AM			UNIT
			MIN	TYP²	MAX
	Input bias current (DTC)	TA = 25°C			1	µA
		TA = MIN and 125°C			3
	Latch mode (source) current (DTC)		± 80	±145		µA
		TA = 25°C	2.30
	Latched input voltage (DTC)	TA = 125°C	2.22	2.32		V
		TA = MIN	2.28	2.40
	Input threshold voltage at f = 10 kHz (DTC)	Zero duty cycle		2.05	*2.25	V
		Maximum duty cycle	*1.20	1.45

*These parameters are not production tested.

² All typical values are at TA = 25°C unless otherwise indicated.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

7

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

error-amplifier section

	PARAMETER	TEST CONDITIONS		TL1451AQ, TL1451AM			UNIT
				MIN	TYP²	MAX
			TA = 25°C			± 6
	Input offset voltage	VO (FEEDBACK) = 1.25 V	TA = 125°C			± 10	mV
			TA = MIN			± 12
			TA = 25°C			±100
	Input offset current	VO (FEEDBACK) = 1.25 V	TA = 125°C			±100	nA
			TA = MIN			±200
			TA = 25°C		160	500
	Input bias current	VO (FEEDBACK) = 1.25 V	TA = 125°C		100	500	nA
			TA = MIN		142	700
				1.05
	Common-mode input voltage range	VCC = 3.6 V to 40 V		to			V
				1.45
			TA = 25°C	70	80
	Open-loop voltage amplification	RF = 200 kΩ	TA = 125°C	70	80		dB
			TA = MIN	64	80
	Unity-gain bandwidth				1.5		MHz
	Common-mode rejection ratio			60	80		dB
	Positive output voltage swing			2			V
	Negative output voltage swing					1	V
			TA = 25°C	0.5	1.6
	Output (sink) current (FEEDBACK)	VID = ± 0.1 V, VO = 1.25 V	TA = 125°C	0.4	1.8		mA
			TA = MIN	0.3	1.7
			TA = 25°C	± 45	± 70
	Output (source) current (FEEDBACK)	VID = 0.1 V, VO = 1.25 V	TA = 125°C	± 25	± 50		µA
			TA = MIN	± 15	± 70

² All typical values are at TA = 25°C unless otherwise indicated.

output section

	PARAMETER	TEST CONDITIONS	TL1451AQ, TL1451AM			UNIT
			MIN	TYP²	MAX
	Collector off-state current	VO = 50 V			10	µA
		TA = 25°C		1.20	2.0
	Output saturation voltage	TA = 125°C		1.60	2.4	V
		TA = MIN		1.36	2.2
	Short-circuit output current	VO = 6 V		90		mA
	² All typical values are at T = 25°C unless otherwise indicated.
	A
	pwm comparator section

	PARAMETER	TEST CONDITIONS	TL1451AQ, TL1451AM			UNIT
			MIN	TYP²	MAX
	Input threshold voltage at f = 10 kHz (FEEDBACK)	Zero duty cycle		2.05	*2.25	V
		Maximum duty cycle	*1.20	1.45

*These parameters are not production tested.

² All typical values are at TA = 25°C unless otherwise indicated.

8	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E ± FEBRUARY 1983 ± REVISED NOVEMBER 1999

total device

	PARAMETER	TEST CONDITIONS	TL1451AQ, TL1451AM			UNIT
			MIN	TYP²	MAX
	Standby supply current	Off-state		1.3	1.8	mA
	Average supply current	RT = 10 kΩ		1.7	2.4	mA
	² All typical values are at T = 25°C unless otherwise indicated.
	A

PARAMETER MEASUREMENT INFORMATION

		S1					Test		VCC = 5 V
							Input
										RL
		CPE	0.47 µF							4.7 kΩ	OUT1
										RL
										4.7 kΩ	OUT2
			16	15	14	13	12	11 10		9
					TL1451A
			1	2	3	4	5	6	7	8
			CT	RT
			330 pF	10 kΩ
							Test
							Input
			Figure 1. Test Circuit
Oscillator Triangle Waveform
Error Amplifier Output											2.0 V
Dead-Time Input Voltage											1.6 V
Short-Circuit Protection											1.4 V
											1.25 V
Comparator Input Voltage											H
PWM Comparator Output Voltage
											L
											Dead Time 100%
Output Transistor Collector											H
											L
Waveform
Protection Enable											0.6 V
											0 V
Terminal Waveform
											tpe²
Short-Circuit Protection											H
Comparator Output											L
Power Supply Voltage			2.8 V TYP								3.6 V
											0 V
² Protection Enable Time, t	pe	= (0.051 x 106 x C ) in seconds
			pe

Figure 2. TL1451A Timing Diagram

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9