IL494N资料

TECHNICAL DATA

IL494

PWM Control Circuit

The IL494 incorporates on a single monolithic chip all thefunctions required in the construction of a pulse-width-modulationcontrol circuit. Designed primarily for power supply control, the IL494contains an on-chip 5-volt regulator, two error amplifiers, adjustableoscillator, dead-time control comparator, pulse-steering flip-flop, andoutput-control circuitry. The uncommitted output transistors provideeither common-emitter or emitter-follower output capability. Push-pullor single-ended output operation may be selected through the output-control function. The architecture of the IL494 prohibits the possibilityof either output being pulsed twice during push-pull operation.• • • • • •

Complete PWM Power Control Circuitry

Uncommitted Outputs for 200 mA Sink or Source

Output Control Selects Single-Ended or Push-Pull OperationInternal Circuitry Prohibits Double Pulse at Either OutputInternal Regulator Provides a Stable 5 V Reference SupplyVariable Dead-Time Provides Control Over Total Range

ORDERING INFORMATIONIL494N PlasticIL494D SOICTA = -20°C to 85° C for all packagesPIN ASSIGNMENT

FUNCTION TABLE

Output ControlGroundedAt Vref

Output Function

Single-ended or Parallel OutputNormal Push-Pull Operation

LOGIC DIAGRAM

1

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IL494

MAXIMUM RATINGS

SymbolVCCVIVOTstg

Supply VoltageAmplifier Input VoltageCollector Output VoltageCollector Output CurrentStorage Temperature

Parameter

Value41VCC +0.341250-65 to +150

UnitVVVmA°C

RECOMMENDED OPERATING CONDITIONS

SymbolVCCVIVO

Supply VoltageAmplifier Input VoltageCollector Output Voltage

Collector Output Current (Each Transistor)Current Into Feed back Terminal

CTRTTA

Timing CapacitorTiming ResistorOscillator Frequency

Operating Free-Air Temperature

0.471.81-20

Parameter

Min7-0.3

Max40VCC - 2402000.310.000500300+85

UnitVVVmAmAnFKΩKHz°C

2

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IL494

ELECTRICAL CHARACTERISTICS (Temperature -20 ∼ 85°C, VCC = 15 V, f=10 kHz))

Symbol

Reference SectionVrefVreginVregout∆VrefISC

Output VoltageOutput regulationInput regulation

Output Voltage change withtemperature

Short-circuit output current(Note 1)Frequency

Standard deviation offrequency (Note 2)Frequency change withvoltage

Frequency change withtemperature

Input bias current (pin 4)Maximum duty cycle, eachoutput

Input threshold voltage(pin 4)

Error Amp SectionVIOIIOIIB

Input offset voltageInput offset currentInput bias currentCommon-mode inputvoltage range

AvolfbCMRRIOIO+

Open-loop voltageamplificationUnity-gain bandwidthCommon-mode rejectionratio

Output sink current (pin 3)Output source current (pin 3)

VCC=40 V, TA=25°CVID=-15 mV to -5 V,VO(pin 3)=0.7 VVID=15 mV to 5 V,VO(pin 3)=3.5 VVO(pin 3)=2.5 VVO(pin 3)=2.5 VVO(pin 3)=2.5 VVCC= 7 V to 40 V

LOWHIGH

∆VO=3 V, VO=0.5 to 3.5 V

-0.3VCC - 270100650.3-2

dBkHzdBmAmA

102501

mVnAµAV

IO=1 mA

VCC=7 V to 40 V, TA=25°CIO=1 to 10 mA, TA=25°CTA= -20°C to 85°CVref=0

4.75

5.252515150

VmVmV%mA

Parameter

Test Conditions

Min

Max

Unit

Oscillator SectionfOSCδfOSCδfOSC(∆V)δfOSC(∆T)

CT=0.01 µF, RT=12 kΩAll values of VCC, CT, RT, TAConstantVCC= 7 V to 40 V,TA=25°C

CT=0.01 µF, RT=12 kΩTA= -20°C to 85°CVI= 0 to 5.25 VVI(pin 4)=0 VZero duty cycleMaximum duty cycle

045

3.3

6

1415102

KHz%%%

Dead Time Control SectionIIB(2T)DCmaxVTHD

-10

µA%V

3

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IL494

ELECTRICAL CHARACTERISTICS(Temperature -20 ∼ 85°C, VCC = 15 V, f=10 kHz))

SymbolVTHPIItrctfctrftffIC(off)IE(off)VSAT

Parameter

Input threshold voltage(pin 3)

Input sink current (pin 3)Output voltage rise timeOutput voltage fall timeOutput voltage rise timeOutput voltage fall timeCollector off-state currentEmitter off-state currentCollector-emittersaturationvoltage

IOCHICCICCATotal Device

Standby supply currentAverage supply current

All other inputs &outputs openV(pin 4)=2 V

VCC=15 VVCC=40 V

101517

mAmA

Common-emitterEmitter-follower

Test Conditions

Zero duty cycleVO(pin 3)=0.7 V

Common-emitter configurationCommon-emitter configurationEmitter-follower configurationEmitter-follower configurationVCE=40 V, VCC=40 VVCC=VC=40 V, VE=0VE=0, IC=200 mAVC=15 V, IE=-200 mAVI=Vref

0.3

200100200100100-1001.32.53.5

mA

Min

Max4.5

UnitVmAnsnsnsnsµAµAV

PWM Comparator Section

Switching Characteristics

Output Section

Output control input current

Notes: 1. Duration of the short circuit should not exceed one second.

2. Standard deviation is a measure of the statistical disribution about the mean as derived from the formula

N

n=1

σ =

∑ (xn - x)2

N - 1

4