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1 2 3 4 5 6 7 816 15 14 13 12 11 10 9
1IN+
1IN−FEEDBACK
DTC
CT
RT
开斋节的习俗GND
C12IN+
2IN−冬瓜排骨汤做法大全
REF
OUTPUT CTRL V CC
C2
E2
E1
D, DB, N, NS, OR PW PACKAGE
(TOP VIEW) DESCRIPTION TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E–JANUARY1983–REVISED FEBRUARY2005
•Complete PWM Power-Control Circuitry
•Uncommitted Outputs for200-mA Sink or历届金像奖影帝
Source Current
•Output Control Selects Single-Ended or
Push-Pull Operation
•Internal Circuitry Prohibits Double Pulse at
Either Output
•Variable Dead Time Provides Control Over
Total Range
•Internal Regulator Provides a Stable5-V
Reference Supply With5%Tolerance
•Circuit Architecture Allows Easy
Synchronization
The TL494incorporates all the functions required in the construction of a pulse-width-modulation(PWM)control circuit on a single chip.Designed primarily for power-supply control,this device offers the flexibility to tailor the power-supply control circuitry to a specific application.
The TL494contains two error amplifiers,an on-chip adjustable oscillator,a dead-time control(DTC)co
mparator, a pulse-steering control flip-flop,a5-V,5%-precision regulator,and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from–0.3V to V CC–2V.The dead-time control comparator has a fixed offset that provides approximately5%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 drive the common circuits in synchronous multiple-rail power supplies.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability.The TL494provides for push-pull or single-ended output operation,which can be selected through the output-control function.The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.
The TL494C is characterized for operation from0°C to70°C.The TL494I is characterized for operation from –40°C to85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES(1)
SHRINK SMALL THIN SHRINK T A SMALL OUTLINE PLASTIC DIP SMALL OUTLINE
OUTLINE SMALL OUTLINE
(D)(N)(NS)
(DB)(PW) 0°C to70°C TL494CD TL494CN TL494CNS TL494CDB TL494CPW –40°C to85°C TL494ID TL494IN———
(1)The D,DB,NS,and PW packages are available taped and reeled.Add the suffix R to device ,TL494CDR).
Please be aware that an important notice concerning availability,standard warranty,and use in critical applications of Texas
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GND
V CC
C1E1
C2E2
FEEDBACK
REF
大学数学公式大全TL494
公顷与亩的换算PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005
FUNCTION TABLE
INPUT TO OUTPUT FUNCTION OUTPUT CTRL V I =GND Single-ended or parallel output V I =V ref
Normal push-pull operation
FUNCTIONAL BLOCK DIAGRAM
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Absolute Maximum Ratings(1) Recommended Operating Conditions
TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E–JANUARY1983–REVISED FEBRUARY2005
over operating free-air temperature range(unless otherwise noted)
MIN MAX UNIT V CC Supply voltage(2)41V
V I Amplifier input voltage V CC+0.3V
V O Collector output voltage41V
I O Collector output current250mA
D package73
DB package82
θJA Package thermal impedance(3)(4)N package67°C/W
NS package64
PW package108 Lead temperature1,6mm(1/16inch)from case for10seconds260°C
T stg Storage temperature range–65150°C (1)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.
(2)All voltages are with respect to the network ground terminal.
(3)Maximum power disipation is a function of T J(max),θJA,and T A.The maximum allowable power dissipation at any allowable ambient
temperatire is P D=(T J(max)–T A)/θJA.Operating at the absolute maximum T J of150°C can affect reliability.
(4)The package thermal impedance is calculated in accordance with JESD51-7.
竹石古诗翻译MIN MAX UNIT V CC Supply voltage740V
V I Amplifier input voltage–0.3V CC–2V
V O Collector output voltage40V Collector output current(each transistor)200mA
Current into feedback terminal0.3mA f OSC Oscillator frequency1300kHz C T Timing capacitor0.4710000nF
R T Timing resistor 1.8500kΩ
TL494C070
T A Operating free-air temperature°C
TL494I–4085
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