Optocoupler driver IC for isolated power supplies improves transient response

20 October 2004 Power Electronics / Power Management

Linear Technology has introduced an optocoupler driver for isolated power supplies that need tight regulation, fast transient response and overshoot protection.

The LT4430, housed in a small

6-pin SOT-23 package, includes a precision low voltage reference (0,6 V, ±0,75%), a high-bandwidth (9 MHz) error amplifier, an inverting optocoupler driver and an overshoot control circuit.

The device simplifies loop frequency compensation as the error amplifier's high bandwidth minimises phase shift and ground-referenced optocoupler drive eliminates the secondary feedback path present with existing optocoupler drivers, says Linear. The LT4430 has a wide input supply range from 3 V to 20 V and the short-circuit protected optocoupler driver can supply up to 10 mA. The device has applications in 48 V input isolated DC/DC converters, industrial control systems, automotive and heavy equipment power supplies.

The optocoupler driver IC has a unique overshoot control circuit that provides independent control of startup and short-circuit recovery characteristics without compromising loop bandwidth and resultant transient response. Existing optocoupler drivers often require sub-optimum small-signal frequency compensation to control both large-signal dynamic and output overshoot at startup, says the company, which degrades the power supply's overall performance. The LT4430's reference stability and error amplifier's 80 dB open loop DC gain help ensure tight DC regulation over all input line and output load conditions.

Further reading:

High-precision current transducer
Power Electronics / Power Management
Danisense announces its new high-precision DP12IP current transducer designed for isolated DC and AC current measurement in demanding PCB-mounted power electronics applications.

Read more...

---

Secure holder for protected 18650 batteries
Power Electronics / Power Management
Designed for protected 18650 batteries up to 70 mm long, the holder offers secure retention for portable, industrial, and embedded applications.

Read more...

---

More room to scale
Altron Arrow Power Electronics / Power Management
With the latest STM32H5 lines from STMicroelectronics, you can now scale within the same platform, from a compact 1 Mbyte device to higher-memory MCUs for graphics-rich and feature-heavy designs.

Read more...

---

Surface mount power amplifier for high-power applications
RF Design Power Electronics / Power Management
The GNA-63-5W+, from Mini-Circuits, is a GaN MMIC Power Amplifier (PA) designed for demanding RF applications requiring high efficiency, excellent linearity, and a compact footprint.

Read more...

---

1200 V QSiC modules
Power Electronics / Power Management
SemiQ Inc has launched the QSiC Dual3, a family of 1200 V half-bridge MOSFET modules for motor drives in data centre cooling systems, grid converters in energy storage systems, and industrial drivers.

Read more...

---

MCOTS transient filter for military applications
RFiber Solutions Power Electronics / Power Management
SynQor has announced the new MCOTS-F-28-T-HE transient half-brick filter, the latest addition to its MCOTS product family.

Read more...

---

Expanded range of high-thermal-performance QSiC modules
Power Electronics / Power Management
SemiQ’s half-bridge series for data centre power converters and industrial motor drives features low RDSON SiC MOSFETs and parallel SBD diodes for best-in-class power density and conversion efficiency.

Read more...

---

Transporting lithium batteries and IoT devices
Power Electronics / Power Management
With billions of rechargeable and non-rechargeable lithium cells and batteries powering most of the world’s consumer and industrial electronic devices, shipping them to customers through vast global logistics chains is often an overlooked topic.

Read more...

---

Setting a new benchmark for high-power DC load testing
Conical Technologies Test & Measurement Power Electronics / Power Management
The new ITECH IT8900G/L high-speed, high-power DC electronic load offers a powerful combination of speed, scalability, precision and high-power density.

Read more...

---

Quality batteries are critical for IIoT
Uniross Batteries Power Electronics / Power Management
Batteries intended for use in industrial operations must indeed offer complete reliability under extreme environmental conditions, resistance to vibration and harsh environments.

Read more...

---