Overview
The TL494CDRE4, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit designed primarily for switch-mode power supply control. This device integrates all the necessary functions for constructing a PWM control circuit on a single chip, offering flexibility to tailor the power-supply control circuitry to specific applications. The TL494 includes features such as on-chip error amplifiers, an adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, and a 5-V reference regulator. It supports both push-pull and single-ended output operations and is characterized for operation over a temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Voltage (VCC) | 7 | - | 40 | V |
| Collector Output Voltage (VC1, VC2) | - | - | 42 | V |
| Output Voltage (REF) | 4.75 | 5 | 5.25 | V |
| Input Regulation | - | - | 25 mV | - |
| Output Regulation | - | - | 15 mV | - |
| Output Voltage Change with Temperature | - | - | 2 mV/V | - |
| Oscillator Frequency (CT = 0.01 μF, RT = 12 kΩ) | - | 10 kHz | - | - |
| Standby Supply Current (VCC = 15 V) | 6 | 10 | - | mA |
| Average Supply Current (VCC = 40 V) | 9 | 15 | - | mA |
Key Features
- Complete Pulse Width Modulation Control Circuitry
- On-chip adjustable oscillator with master or slave operation
- On-chip error amplifiers with a common-mode voltage range from –0.3 V to VCC – 2 V
- On-chip 5-V reference regulator with ±5% precision
- Adjustable dead-time control comparator
- Pulse-steering control flip-flop for alternating output transistors
- Uncommitted output transistors rated to 500 mA source or sink
- Output control for push-pull or single-ended operation
- Undervoltage lockout
Applications
- Switch-mode power supplies
- Server power supplies
- Solar micro-inverters
- Washing machines (low-end and high-end)
- E-bikes
- Telecom/server AC/DC supplies
- Smoke detectors
- Solar power inverters
Q & A
- What is the primary function of the TL494?
The TL494 is a pulse-width-modulation (PWM) control circuit designed primarily for switch-mode power supply control.
- What are the key components of the TL494?
The TL494 includes two error amplifiers, an on-chip adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, and a 5-V reference regulator.
- What is the operating temperature range of the TL494CDRE4?
The TL494CDRE4 is characterized for operation from 0°C to 70°C.
- What types of output operations does the TL494 support?
The TL494 supports both push-pull and single-ended output operations.
- What is the precision of the on-chip 5-V reference regulator?
The on-chip 5-V reference regulator has an initial accuracy of ±5%.
- Can the oscillator be bypassed?
Yes, the oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT.
- What is the maximum collector output voltage?
The maximum collector output voltage is 42 V.
- What is the typical standby supply current at VCC = 15 V?
The typical standby supply current at VCC = 15 V is 10 mA.
- What are some common applications of the TL494?
Common applications include switch-mode power supplies, server power supplies, solar micro-inverters, and more.
- Does the TL494 have undervoltage lockout protection?
Yes, the TL494 includes undervoltage lockout protection.
