Texas Instruments TL594CDR, TL594CD, TL594IN, TL594IDR, TL594ID Datasheet

TL594

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C ± APRIL 1988 ± REVISED JULY 1999

D Complete PWM Power Control Circuitry	D OR N PACKAGE
D Uncommitted Outputs for 200-mA Sink or			(TOP VIEW)
Source Current	1IN+					2IN+
			1	16
D Output Control Selects Single-Ended or
	1IN±		2	15		2IN±
Push-Pull Operation
	FEEDBACK		3	14		REF
D Internal Circuitry Prohibits Double Pulse at
	DTC		4	13		OUTPUT CTRL
Either Output
	CT		5	12		VCC
D Variable Dead Time Provides Control Over
	RT		6	11		C2
Total Range	GND		7	10		E2
D Internal Regulator Provides a Stable 5-V	C1		8	9		E1
Reference Supply Trimmed to 1%
D Circuit Architecture Allows Easy
Synchronization
D Undervoltage Lockout for Low VCC
Conditions

description

The TL594 incorporates all the functions required in the construction of a pulse-width-modulation control circuit on a single chip. Designed primarily for power-supply control, these devices offer the systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.

The TL594 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator with a precision of 1%, an undervoltage lockout control circuit, and output control circuitry.

The error amplifiers exhibit a common-mode voltage range from ±0.3 V to VCC ±2 V. The DTC comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can be used to drive the common circuitry in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, with selection by means of the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.

The TL594C is characterized for operation from 0°C to 70°C. The TL594I is characterized for operation from ±40°C to 85°C.

	FUNCTION TABLE
INPUT
	OUTPUT FUNCTION
OUTPUT
CTRL
VI = ±0	Single-ended or parallel output
VI = Vref	Normal push-pull operation

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

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

TL594

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C ± APRIL 1988 ± REVISED JULY 1999

AVAILABLE OPTIONS

		PACKAGED DEVICES		CHIP FORM
	TA
		SMALL OUTLINE	PLASTIC DIP
				(Y)
		(D)	(N)
	0°C to 70°C	TL594CD	TL594CN	TL594Y
	±40°C to 85°C	TL594ID	TL594IN

The D package is available taped and reeled. Add ªRº suffix to device type (e.g.,

TL594CDR). Chip forms are tested at 25°C.

functional block diagram

					OUTPUT CTRL
					(see Function Table)
					13
	RT	6		Oscillator
		5
	CT				8
						C1
				DTC	1D
					9
	≈ 0.1 V			Comparator		E1
	DTC	4			C1
				PWM	11	C2
		1	Error Amplifier 1 Comparator
	IN+			+	10	E2
		2		1	Pulse-Steering
	IN±
				±	Flip-Flop
			Error Amplifier 2		12	VCC
		16			Undervoltage
	IN+			+
					Lockout
	IN±	15		2	Control
				±
					Reference
					Regulator
					14	REF
	FEEDBACK	3			7	GND
				0.7 mA

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TL594

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C ± APRIL 1988 ± REVISED JULY 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²

				TL594X	UNIT
	Supply voltage, VCC (see Note 1)			41	V
	Amplifier input voltage			VCC+0.3	V
	Collector output voltage			41	V
	Collector output current			250	mA
	Package thermal impedance, θJA	(see Notes 2 and 3)	D package	73	°C
			N package	88
	Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds			260	°C
	Storage temperature range, Tstg			±65 to 150	°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.

NOTES: 1. All voltage values, except differential voltages, are with respect to the network ground terminal.

2.Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) ± TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability.

3.The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero.

recommended operating conditions

			MIN	MAX	UNIT
	Supply voltage, VCC		7	40	V
	Amplifier input voltage, VI		±0.3	VCC±2	V
	Collector output voltage, VO			40	V
	Collector output current (each transistor)			200	mA
	Current into feedback terminal			0.3	mA
	Timing capacitor, CT		0.47	10000	nF
	Timing resistor, RT		1.8	500	kΩ
	Oscillator frequency, fosc		1	300	kHz
	Operating free-air temperature, TA	TL594C	0	70	°C
		TL594I	±40	85	°C

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

4

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

s + N * 1

# Temperature coefficient of timing capacitor and timing resistor not taken into account.

(xn * X)2

N

n+1

TL594

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C ± APRIL 1988 ± REVISED JULY 1999

electrical characteristics over recommended operating conditions, VCC = 15 V, (unless otherwise noted)

reference section

	PARAMETER	TEST CONDITIONS²		TL594C, TL594I			UNIT
				MIN	TYP³	MAX
	Output voltage (REF)	IO = 1 mA,	TA = 25°C	4.95	5	5.05	V
	Input regulation	VCC = 7 V to 40 V,	TA = 25°C		2	25	mV
	Output regulation	IO = 1 to 10 mA,	TA = 25°C		14	35	mV
	Output-voltage change with temperature	TA = MIN to MAX			2	10	mV/V
	Short-circuit output current§	V = 0		10	35	50	mA
		ref
	² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
	³ All typical values except for parameter changes with temperature are at T = 25°C.
	§ Duration of the short circuit should not exceed one second.	A

amplifier section (see Figure 1)

PARAMETER		TEST CONDITIONS						TL594C, TL594I			UNIT
								MIN	TYP³	MAX
Input offset voltage, error amplifier	FEEDBACK = 2.5 V								2	10	mV
Input offset current	FEEDBACK = 2.5 V								25	250	nA
Input bias current	FEEDBACK = 2.5 V								0.2	1	µA
Common-mode input voltage range,								0.3
	VCC = 7 V to 40 V							to			V
error amplifier
								VCC±2
Open-loop voltage amplification, error	VO = 3 V,		RL = 2 kΩ,			VO = 0.5 V to 3.5 V		70	95		dB
amplifier
Unity-gain bandwidth	VO = 0.5 V to 3.5 V,		RL = 2 kΩ						800		kHz
Common-mode rejection ratio, error	VCC = 40 V,		TA = 25°C					65	80		dB
amplifier
Output sink current, FEEDBACK	VID = ±15 mV to ±5 V,		FEEDBACK = 0.5 V					0.3	0.7		mA
Output source current, FEEDBACK	VID = 15 mV to 5 V,		FEEDBACK = 3.5 V					±2			mA
³ All typical values except for parameter changes with temperature are at T					= 25°C.
				A
oscillator section, CT = 0.01 µF, RT = 12 kΩ (see Figure 2)
PARAMETER			TEST CONDITIONS²					TL594C, TL594I			UNIT
								MIN	TYP³	MAX
Frequency									10		kHz
Standard deviation of frequency¶		All values of V		CC	, C , R , and T constant				100		Hz/kHz
					T	T	A
Frequency change with voltage		VCC = 7 V to 40 V,				TA = 25°C			1		Hz/kHz
Frequency change with temperature#		T = MIN to MAX								50	Hz/kHz
		A
² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
³ All typical values except for parameter changes with temperature are at T					= 25°C.
				A

¶ Standard deviation is a measure of the statistical distribution about the mean as derived from the formula: