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TL494 The TL494 PWM Controller incorporates 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 TL494 PWM Controller contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.The error amplifiers exhibit a common-mode voltage range from -0.3 V to VCC -2 V. The dead-time control 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 drive the common circuits in synchronous multiple-rail power supplies.The uncommitted output transistors provide either common-emitter or emitter-follower output capability. This PWM Controller provides 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 PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.

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Description

The TL494 PWM Controller incorporates 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 TL494 PWM Controller contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.The error amplifiers exhibit a common-mode voltage range from -0.3 V to VCC -2 V. The dead-time control 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 drive the common circuits in synchronous multiple-rail power supplies.The uncommitted output transistors provide either common-emitter or emitter-follower output capability. This PWM Controller provides 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 PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.

Title

PWM Controller (up to 200 kHz)

ECAD Module
Manufacturer Part Number: TL494
Brand: EST
DateCode: 10+
Package / Case: SOP16
Category: Integrated Circuits (ICs)
Warranty: 100% Perfect Functions

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ECAD Module

Product Attributes

Description: The TL494 is a fixed frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply. Features: Internal Regulated 5V Reference Pulse-Width Modulation Control Circuitry Output Control for Single-Ended or Push-Pull Configuration Output Clamp Diodes Output Offset Voltage Adjustment Internal Dead-Time Control Internal Soft-Start Internal Frequency Compensation Output Current Limiting Thermal Shutdown Applications: Switching Power Supplies Uninterruptible Power Supplies Motor Control Lighting Control Battery Chargers DC-DC Converters (For reference only)

TL494 is a PWM (pulse width modulation) control IC. It can be used in any application where PWM control can be used from a feedback signal input such as voltage regulators, Power supplies, heating element temperature controllers, motor speed controllers etc. TL494 consist of all the required peripherals which require to PWM control a load. TL494 comes in a 16 pin DIP package. you can see the pinout of the TL494 in below.

SupplierFile/202006/05/f_e250e685b5684de4bf6ca18c2d041613.png

Lets go through some of the features of the TL494 PWM controller IC,

· Output selectable sink or source current outputs

· Selectable single ended or push pull output operation types

· Inbuilt double pulse prevention circuitry

· Variable dead time capabilities throughout the whole range

· Internal 5V stable reference voltage

· Easy synchronization capabilities

As discussed, earlier TL494 is suitable for lots of application we are going to consider high current power supply. Usually voltage regulator IC can handle couple of amperes in output side. However, when high current is needed we need to go for SMPS which are expensive when the output current is high. So lets see how to build 5V 10A regulator using TL494. You can see the circuit for the above mentioned circuit in below image.

SupplierFile/202006/05/f_cc9471853ab9472ca4ec5a90decce95c.png

In here one signal transistor and one power transistor is used to control the load power. R8 and R9 are acting in a voltage divider to give TL494 a feedback on the output voltage. When the output voltage varies from the set voltage TL494 will increase or decrease the pulse width of the switching signal to match the output voltage to the set voltage. There are some filter and reference RC circuitry in the circuit. The connections for these RC circuits are given in the datasheet of the TL494 IC. By using high power transistors and suitable values or the voltage divider we can built any voltage current regulators using TL494 PWM controller IC. Also this can be used with a variable voltage divider to build a variable supply suitable for a lab bench supply.

Preview of the first 3 pages of the data sheet

Document Preview

SWITCHMODETM Pulse Width Modulation Control Circuit

The is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control.

Features

Complete Pulse Width Modulation Control Circuitry On-Chip Oscillator with Master or Slave Operation On-Chip Error Amplifiers On-Chip 5.0 V Reference Adjustable Deadtime Control Uncommitted Output Transistors Rated 500 mA Source or Sink Output Control for Push-Pull or Single-Ended Operation Undervoltage Lockout NCV Prefix for Automotive and Other Applications Requiring Site

MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted.)
Power Supply Voltage Collector Output Voltage
Collector Output Current (Each transistor) (Note 1)

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. Maximum thermal limits must be observed.

I = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package

*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.

See detailed ordering and shipping information in the package dimensions section on page 4 of this data sheet.

Power Supply Voltage Collector Output Voltage Collector Output Current (Each transistor) Amplified Input Voltage Current Into Feedback Terminal Reference Output Current Timing Resistor Timing Capacitor Oscillator Frequency

ELECTRICAL CHARACTERISTICS (VCC = 0.01 mF, = 12 kW, unless otherwise noted.) For typical values = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.

Collector-Emitter Saturation Voltage (Note 2) Common-Emitter (VE = 200 mA) Emitter-Follower (VC = -200 mA)

Output Control Pin Current Low State (VOC 0.4 V) High State (VOC = Vref)
Output Voltage Rise Time Common-Emitter (See Figure 12) Emitter-Follower (See Figure 13)
Output Voltage Fall Time Common-Emitter (See Figure 12) Emitter-Follower (See Figure 13)

2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

ERROR AMPLIFIER SECTION Input Offset Voltage (VO (Pin 2.5 V) Input Offset Current (VO (Pin 2.5 V) Input Bias Current (VO (Pin 2.5 V) Input Common Mode Voltage Range (VCC = 25°C) Open Loop Voltage Gain (DVO = 2.0 kW) Unity-Gain Crossover Frequency (VO = 2.0 kW) Phase Margin at Unity-Gain (VO = 2.0 kW) Common Mode Rejection Ratio (VCC 40 V) Power Supply Rejection Ratio (DVCC = 2.0 kW) Output Sink Current (VO (Pin 0.7 V) Output Source Current (VO (Pin 3.5 V)

PWM COMPARATOR SECTION (Test Circuit Figure 11) Input Threshold Voltage (Zero Duty Cycle)

Input Sink Current (V(Pin 0.7 V) DEADTIME CONTROL SECTION (Test Circuit Figure 11) Input Bias Current (Pin 4) (VPin 5.25 V) Maximum Duty Cycle, Each Output, Push-Pull Mode

(VPin = 0.01 mF, = 12 kW) (VPin = 0.001 mF, = 30 kW) Input Threshold Voltage (Pin 4) (Zero Duty Cycle) (Maximum Duty Cycle)

Frequency Change with Temperature (DTA = Tlow to Thigh) (CT = 0.01 mF, = 12 kW)
Standby Supply Current (Pin 6 at Vref, All other inputs and outputs open) (VCC 15 V) (VCC 40 V)
Average Supply Current (CT = 0.01 mF, = 12 kW, V(Pin 2.0 V) (VCC 15 V) (See Figure 12)

* Standard deviation is a measure of the statistical distribution about the mean as derived from the formula, s

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mauricio galvez ve17343

TL494

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Very satisfied with

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TL494

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TL4941

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Fast shipping. Everything works. Thanks seller

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TL494C

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TL494CDR

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TL494IN

Spain Mostoles

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TL494C

Peru jesus maria

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Todo muy bien. atte el che

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TL494CN

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TL494 The TL494 PWM Controller incorporates 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 TL494 PWM Controller contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.The error amplifiers exhibit a common-mode voltage range from -0.3 V to VCC -2 V. The dead-time control 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 drive the common circuits in synchronous multiple-rail power supplies.The uncommitted output transistors provide either common-emitter or emitter-follower output capability. This PWM Controller provides 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 PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.

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Alternate Names

TL494

TL494 has several brands around the world that may have alternate names for TL494 due to regional differences or acquisition. TL494 may also be known as the following names: