Overview
The TL598CDR, produced by Texas Instruments, is a pulse-width-modulated (PWM) power-control integrated circuit designed primarily for power-supply control applications. This device integrates all the necessary functions for constructing PWM controlled systems on a single chip, providing system engineers with the flexibility to tailor power-supply control circuits to specific applications. The TL598CDR includes two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC) comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output control circuits. It features totem-pole outputs capable of sinking or sourcing 200 mA of current, which is ideal for power FET control.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 7 | 40 | V | |
| Amplifier Input Voltage (VI) | 0 | VCC - 2 | V | |
| Output Current (each output), sink or source | 200 | mA | ||
| Oscillator Frequency (fosc) | 1 | 300 | kHz | |
| Operating Free-Air Temperature (TA) | 0 | 70 | °C | |
| Reference Output Voltage (REF) | 4.95 | 5 | 5.05 | V |
| Output Voltage Rise Time | 60 | 150 | ns | |
| Output Voltage Fall Time | 35 | 75 | ns |
Key Features
- Complete PWM power-control function on a single chip.
- Totem-pole outputs for 200-mA sink or source current.
- Output control selects parallel or push-pull operation.
- Internal circuitry prohibits double pulse at either output.
- Variable dead-time provides control over total range.
- Internal regulator provides a stable 5-V reference supply, trimmed to 1% tolerance.
- On-board output current-limiting protection.
- Undervoltage lockout for low-VCC conditions.
- Separate power and signal grounds.
- Exceptional rise- and fall-time performance for power FET control.
Applications
- Buck, Boost, Flyback, Forward Converter.
- Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output.
- Step-Down, Step-Up/Step-Down DC-DC converters.
- Synchronous multiple supply operations.
- Power-supply control circuits in various electronic systems.
Q & A
- What is the primary function of the TL598CDR?
The TL598CDR is designed primarily for power-supply control, providing a complete PWM power-control function on a single chip.
- What types of outputs does the TL598CDR have?
The TL598CDR features totem-pole outputs capable of sinking or sourcing 200 mA of current.
- How can the output operation be controlled?
The output control function allows selection between parallel or push-pull operation.
- What is the purpose of the internal regulator?
The internal regulator provides a stable 5-V reference supply, trimmed to 1% tolerance.
- What protection features does the TL598CDR include?
The device includes on-board output current-limiting protection and undervoltage lockout for low-VCC conditions.
- How does the TL598CDR handle dead-time control?
The device features variable dead-time control, which provides control over the total range, and internal circuitry that prohibits double pulse at either output.
- What is the operating temperature range of the TL598CDR?
The operating free-air temperature range is from 0°C to 70°C.
- What are the typical applications of the TL598CDR?
The TL598CDR is used in Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and other DC-DC converter applications.
- How can the oscillator frequency be adjusted?
The oscillator frequency can be adjusted externally using the RT and CT pins.
- What is the significance of separate power and signal grounds?
The separate power and signal grounds help eliminate errors caused by high current-induced voltage drops and common-mode noise.
