IL494D

IL494 INTEGRAL | Alldatasheet

Document overview

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Technical content

The IL494 incorporates on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control, the IL494 contains an on-chip 5-volt regulator, two error amplifiers, adjustable oscillator, dead-time control comparator, pulse-steering flip-flop, and output-control circuitry. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Push-pull or single-ended output operation may be selected through the output- control function. The architecture of the IL494 prohibits the possibility of 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 Operation
• Internal Circuitry Prohibits Double Pulse at Either Output
• Internal Regulator Provides a Stable 5 V Reference Supply
• Variable Dead-Time Provides Control Over Total Range IL494

ORDERING INFORMATION

TA = -20°C to 85° C for all packages PIN ASSIGNMENT FUNCTION TABLE Output Control Output Function Grounded Single-ended or Parallel Output At Vref Normal Push-Pull Operation LOGIC DIAGRAM

Symbol Parameter Value Unit VCC Supply Voltage 41 V VI Amplifier Input Voltage V CC +0.3 V VO Collector Output Voltage 41 V Collector Output Current 250 mA Tstg Storage Temperature -65 to +150 °C RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit VCC Supply Voltage 7 40 V VI Amplifier Input Voltage -0.3 V CC - 2 V VO Collector Output Voltage 40 V Collector Output Current (Each Transistor) 200 mA Current Into Feed back Terminal 0.3 mA CT Timing Capacitor 0.47 10.000 nF RT Timing Resistor 1.8 500 KΩ Oscillator Frequency 1 300 KHz TA Operating Free-Air Temperature -20 +85 °C

ELECTRICAL CHARACTERISTICS (Temperature -20 ∼ 85°C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit Reference Section Vref Output Voltage I O=1 mA 4.75 5.25 V Vregin Output regulation VCC=7 V to 40 V, TA=25°C 25 mV Vregout Input regulation IO=1 to 10 mA, TA=25°C 15 mV ∆Vref Output Voltage change with temperature TA= -20°C to 85°C 1% ISC Short-circuit output current (Note 1) Vref=0 50 mA Oscillator Section fOSC Frequency CT=0.01 µF, RT=12 kΩ 6 14 KHz δfOSC Standard deviation of frequency (Note 2) All values of VCC, CT, RT, TA Constant 15 % δfOSC(∆V) Frequency change with voltage VCC= 7 V to 40 V, TA=25°C 10 % δfOSC(∆T) Frequency change with temperature CT=0.01 µF, RT=12 kΩ TA= -20°C to 85°C Dead Time Control Section IIB(2T) Input bias current (pin 4) V I= 0 to 5.25 V -10 µA DCmax Maximum duty cycle, each output VI(pin 4)=0 V 45 % VTHD Input threshold voltage Zero duty cycle 3.3 V (pin 4) Maximum duty cycle 0 Error Amp Section VIO Input offset voltage V O(pin 3)=2.5 V 10 mV IIO Input offset current V O(pin 3)=2.5 V 250 nA IIB Input bias current V O(pin 3)=2.5 V 1 µA Common-mode input V CC= 7 V to 40 V LOW -0.3 V voltage range HIGH V CC - 2 Avol Open-loop voltage amplification ∆VO=3 V, VO=0.5 to 3.5 V 70 dB fb Unity-gain bandwidth 100 kHz CMRR Common-mode rejection ratio VCC=40 V, TA=25°C 65 dB IO Output sink current (pin 3) V ID=-15 mV to -5 V, VO(pin 3)=0.7 V 0.3 mA IO+ Output source current (pin 3) V ID=15 mV to 5 V, VO(pin 3)=3.5 V -2 mA

ELECTRICAL CHARACTERISTICS(Temperature -20 ∼ 85°C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit PWM Comparator Section VTHP Input threshold voltage (pin 3) Zero duty cycle 4.5 V II Input sink current (pin 3) V O(pin 3)=0.7 V 0.3 mA Switching Characteristics trc Output voltage rise time Common-emitter configuration 200 ns tfc Output voltage fall time Common-emitter configuration 100 ns trf Output voltage rise time Emitter-follower configuration 200 ns tff Output voltage fall time Emitter-follower configuration 100 ns Output Section IC(off) Collector off-state current V CE=40 V, VCC=40 V 100 µA IE(off) Emitter off-state current V CC=VC=40 V, VE=0 -100 µA VSAT Collector- emitter Common- emitter VE=0, IC=200 mA 1.3 V saturation voltage Emitter- follower VC=15 V, IE=-200 mA 2.5 IOCH Output control input current V I=Vref 3.5 mA Total Device ICC Standby supply current All other inputs & V CC=15 V 10 mA outputs open V CC=40 V 15 ICCA Average supply current V (pin 4)=2 V 17 mA 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 ∑ (xn - x)2 n=1 σ = N - 1