TL1551AC

TL1451AC TI1 | Alldatasheet

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TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 Copyright  1995, Texas Instruments Incorporated 4–1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• Complete PWM Power Control Circuitry
• Completely Synchronized Operation
• Internal Undervoltage Lockout Protection
• Wide Supply Voltage Range
• Internal Short-Circuit Protection
• Oscillator Frequency... 500 kHz Max
• Variable Dead Time Provides Control Over Total Range
• Internal Regulator Provides a Stable 2.5-V Reference Supply

description

The TL1451AC 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 TL1451AC 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. 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 V CC 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. AVAILABLE OPTIONS T PACKAGED DEVICES CHIP FORMTA SMALL OUTLINE (DB)† PLASTIC DIP (N) SMALL OUTLINE (NS) TSSOP (PW)† CHIP FORM (Y) –20°C to 85°C TL1451ACDB TL1451ACN TL1451ACNS TL1451ACPW TL1451AY † The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE). CT RT ERROR 1IN+ AMPLIFIER 1 1IN– 1FEEDBACK 1DTC 1OUT GND REF SCP 2IN+ ERROR 2IN– AMPLIFIER 2 2FEEDBACK 2DTC 2OUT V CC DB, N, NS, OR PW PACKAGE (TOP VIEW) 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.

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional block diagram Oscillator Reference Voltage 1/2 Vref R S 170 kΩ UVLO R 92 1 VCC RT CT REF GND PWM COMP PWM COMP 12 kΩ

2 DTC

IN–

2 FEEDBACK

1 FEEDBACK

IN–

1 DTC

2 OUTPUT

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL1451AY chip information This chip, when properly assembled, displays characteristics similar to the TL1451AC. Thermal compression or ultrasonic bonding may be used on the doped aluminum bonding pads. The chip may be mounted with conductive epoxy or a gold-silicon preform. BONDING PAD ASSIGNMENTS CHIP THICKNESS:

15 MILS TYPICAL

BONDING PADS: 4 × 4 MILS MINIMUM TJmax = 150°C TOLERANCES ARE ± 10%. ALL DIMENSIONS ARE IN MILS. (1) (2) (3) (4) (5) (6) (7) (8) (9)(10) (11) (12) (13) (14) (15) (16) TL1451Y (2) (14) (1) (3) (4) (5) (6) (7) (8) (16) (13) (12) (11) (10) (9) REF 2IN+ 2IN– 2FEEDBACK 2DTC 2OUT VCCGND 1DTC 1FEEDBACK 1IN – RT CT 1OUT (15) SCP 1IN+

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 absolute maximum ratings over operating free-air temperature range† † Stresses beyond those listed under “absolute maximum ratings” 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 “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE T A = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING DB 775 mW 6.2 mW/°C 496 mW 403 mW N 1000 mW 8.0 mW/ °C 640 mW 520 mW NS 500 mW 4.0 mW/ °C 320 mW 260 mW PW 700 mW 5.6 mW/°C 448 mW 364 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 Operating free-air temperature, TA –20 85 °C electrical characteristics over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted) reference section PARAMETER TEST CONDITIONS TL1451AC TL1451Y UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 2.5 V Output voltage change with temperature O utput voltage change with temperature Input voltage regulation VCC = 3.6 V to 40 V 2 12.5 2 mV Output voltage regulation IO = 0.1 mA to 1 mA 1 7.5 1 mV Short-circuit output current VO = 0 3 10 30 10 mA † All typical values are at TA = 25°C.

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 undervoltage lockout section PARAMETER TEST CONDITIONS TL1451AC, TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX UNIT Upper threshold voltage (VCC ) I0 1 A T 2 5 °C 2.72 V Lower threshold voltage (VCC ) IO(ref)=01m A T A =2 5°C 2.6 V Hysteresis (VCC ) IO(ref) = 0.1 mA, TA = 25°C 80 120 mV Reset threshold voltage (VCC ) 1.5 1.9 V † All typical values are at TA = 25°C. short-circuit protection control section PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Standby voltage (SCP) No pullup 140 185 230 185 mV Latched input voltage (SCP) No pullup 60 120 60 mV Input (source) current VI = 0.7 V, TA = 25°C –10 –15 –20 –10 –15 –20 µA Comparator threshold voltage (FEEDBACK) 1.18 1.18 V † All typical values are at TA = 25°C. oscillator section PARAMETER TEST CONDITIONS TL1451C TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Frequency C T = 330 pF, R T = 10 kΩ 200 200 kHz Standard deviation of frequency C T = 330 pF, R T = 10 kΩ 10% 10% Frequency change with voltage VCC = 3.6 V to 40 V 1% 1% Frequency change with temperature Frequency change with temperature † All typical values are at TA = 25°C. dead-time control section PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Input bias current (DTC) 1 µA Latch mode (source) current (DTC) TA = 25°C –80 –145 –80 –145 µA Latched input voltage (DTC) IO = 40 µA 2.3 V Input threshold voltage atf=1 0k H z(DTC) Zero duty cycle 2.05 2.25 2.05 VInput threshold voltage at f = 10 kHz (DTC) Maximum duty cycle 1.2 1.45 1.45 V † All typical values are at TA = 25°C.

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 error-amplifier section PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT 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 160 500 160 nA Cd i l V 3 6 V 40 V 1.05 VCommon-mode input voltage range VCC = 3.6 V to 40 V 1.05 to Vpg g CC 1.45 Open-loop voltage amplification R F = 200 kΩ 70 80 80 dB Unity-gain bandwidth 1.5 1.5 MHz Common-mode rejection ratio 60 80 80 dB Positive output voltage swing Vref–0.1 V Negative output voltage swing 1 V Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V –45 –70 –70 µA † All typical values are at TA = 25°C. output section PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Collector off-state current VO = 50 V 10 µA Output saturation voltage IO = 10 mA 1.2 2 1.2 V Short-circuit output current VO = 6 V 90 90 mA † All typical values are at TA = 25°C. pwm comparator section PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Input threshold voltage atf=1 0k H z(FEEDBACK) Zero duty cycle 2.05 2.25 2.05 VInput threshold voltage at f = 10 kHz (FEEDBACK) Maximum duty cycle 1.2 1.45 1.45 V † All typical values are at TA = 25°C. total device PARAMETER TEST CONDITIONS TL1451AC TL1451AY UNITPARAMETER TEST CONDITIONS MIN TYP † MAX MIN TYP † MAX UNIT Standby supply current Off-state 1.3 1.8 1.3 mA Average supply current R T = 10 kΩ 1.7 2.4 1.7 mA † All typical values are at TA = 25°C.

Figure 1. Test Circuit

2.8 V TYP

Figure 2. TL1451AC Timing Diagram

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–11POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 0 50 100 150 tpe – Protection Enable Time – s PROTECTION ENABLE TIME vs PROTECTION ENABLE CAPACITANCE 200 250 tpe C PE – Protection Enable Capacitance – µF Protection Latch SR C PE U.V.L.O.ERROR AMP 1 ERROR AMP 2 1.25 V Short-circuit Protection Comparator 12 kΩ 15 16 SCP V ref 170 kΩ Vref Vref Figure 14

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 1.75 1.5 0.75 2.25 1.25 1 k 10 k 100 k 1 M 10 M Error Amp Maximum Output Voltage Swing – V f – Frequency – Hz ERROR AMP MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY 0.5 0.25 VCC = 5 V TA = 25°C 100 1 k 10 k 100 k 1 M 2 M Open-Loop Voltage Amplification – dB f – Frequency – Hz OPEN-LOOP VOLTAGE AMPLIFICATION vs FREQUENCY VCC = 5 V TA = 25°C Figure 15 Figure 16 –20 1 k 10 k 100 k G – Gain – dB f – Frequency – Hz GAIN (AMPLIFIER IN UNITY-GAIN CONFIGURATION) vs FREQUENCY

1 M 10 M

–10 –15 VCC = 5 V TA = 25°C Figure 17

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–13POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 47 pF 470 pF 4700 pF C X: Phase Shift (Right Scale) Closed-Loop Gain (Left Scale) VCC = 5 V R ref = 150 Ω C ref = 470 pF TA = 25°C 100 1 k 10 k 100 k 1 M Closed-Loop Gain – dB f – Frequency – Hz CLOSED-LOOP GAIN AND PHASE SHIFT vs FREQUENCY –10° –20° –30° –40° –50° –60° –70° –80° –90° Phase Shift C x R ref C ref Vref 39 kΩ 39 kΩ Test Circuit Figure 18

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 47 pF 470 pF 4700 pF C X: Phase Shift (Right Scale) Closed-Loop Gain (Left Scale) VCC = 5 V R ref = 15 Ω C ref = 470 pF TA = 25°C 100 1 k 10 k 100 k 1 M Closed-Loop Gain – dB f – Frequency – Hz CLOSED-LOOP GAIN AND PHASE SHIFT vs FREQUENCY –10° –20° –30° –40° –50° –60° –70° –80° –90° Phase Shift C x R ref C ref Vref 39 kΩ 39 kΩ Test Circuit Figure 19

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–15POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 47 pF 470 pF 4700 pF C X: Phase Shift (Right Scale)Closed-Loop Gain (Left Scale) VCC = 5 V R ref = 15 Ω C ref = 470 pF TA = 25°C 100 1 k 10 k 100 k 1 M Closed-Loop Gain – dB f – Frequency – Hz CLOSED-LOOP GAIN AND PHASE SHIFT vs FREQUENCY –10° –20° –30° –40° –50° –60° –70° –80° –90° Phase Shift C x R ref C ref Vref 39 kΩ 39 kΩ Test Circuit Figure 20

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS Phase Shift (Right Scale) Closed-Loop Gain (Left Scale) VCC = 5 V C ref = 470 pF TA = 25°C 100 1 k 10 k 100 k 1 M Closed-Loop Gain – dB f – Frequency – Hz CLOSED-LOOP GAIN AND PHASE SHIFT vs FREQUENCY –10° –20° –30° –40° –50° –60° –70° –80° –90° Phase Shift C ref Vref 39 kΩ 39 kΩ Test Circuit Figure 21

TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995 4–19POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

470 Ω 1 µF220 Ω 33 kΩ 33 kΩ 470 Ω 150 Ω220 kΩ 0.47 µF 50 kΩ 500 pF pF C5 R5 500 87654321 910111213141516 330 pF 33 kΩ 33 kΩ Vref 33 kΩ 33 kΩ 470 Ω 470 Ω VCC Step-Up Output Step-Down Output TL1451AC NOTE A. Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application. Figure 28. High-Speed Dual Switching Regulator

4–20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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