Блог компании Mingjiada Electronics Supply ADI LT1952 Series Current Mode PWM Controllers

Mingjiada Electronics Supply ADI LT1952 Series Current Mode PWM Controllers

In the design of telecommunications power supplies, industrial power supplies and isolated DC-DC converters, current-mode PWM controllers are widely used due to their fast dynamic response, flexible loop compensation and ease of implementing cycle-by-cycle current limiting. Mingjiada Electronics has long supplied the [ADI] LT1952 series of current-mode PWM controllers. These devices integrate synchronous rectification control, programmable slope compensation, soft start, under-voltage lockout and programmable switching frequency, amongst other features. They are primarily intended for power supply topologies such as isolated forward converters, helping to simplify the design of isolated power supplies, improve conversion efficiency and enhance system reliability.

[ADI] LT1952: Single-switch synchronous forward controller
The LT1952 is a current-mode PWM controller optimised specifically for controlling forward converter topologies, utilising a single main MOSFET. The LT1952 provides synchronous rectifier control, thereby achieving extremely high efficiency. A programmable volt-second clamp provides a safety mechanism for transformer reset to prevent transformer saturation. This allows the MOSFET on the primary side to operate reliably at duty cycles greater than 50 per cent, enabling high utilisation of the MOSFET, transformer and rectifier. The LT1952 features a soft-start function designed to provide a controlled exit from shutdown and under-voltage lockout states. A precise 107 mV current-limit threshold, independent of duty cycle, is combined with the soft-start function to provide ‘hiccup’ short-circuit protection. The micro-power start-up enables the LT1952 to be optimised for high input voltages.

LT1952 Key Features:
High-efficiency synchronous rectifier control
Programmable volt-second clamping
Output power levels from 25W to 500W
Low inrush current
(LT1952 = 460µA; VIN on/off = 14.25V / 8.75V)
(LT1952-1 = 400 µA; VIN on/off = 7.75 V / 6.5 V)
True PWM soft start
Low-stress short-circuit protection
Precise 107 mV current limit threshold
Adjustable delay for synchronisation timing
Precise shutdown threshold with programmable hysteresis
Programmable slope compensation
Programmable pulse leading-edge blanking
Programmable frequency (100 kHz to 500 kHz)
Can be synchronised to an external clock with a frequency up to 1.5 × fOSC
Internal 1.23 V reference
2.5 V external reference
Current-mode control
Small-outline 16-pin SSOP package

Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing distributor of the ADI/LINEAR product range, with the LT1952 series of current-mode PWM controllers always in stock, including but not limited to the following:
LT1952EGN
LT1952EGN-1
LT1952IGN
LT1952IGN-1
LT1952MPGN
LT1952MPGN-1

The LT1952 series of current-mode PWM controllers are suitable for applications such as isolated forward converters, communications and data communications power supplies, industrial control power supplies, distributed power systems, base station equipment power supplies and battery-powered isolated power supplies.

Mingjiada Electronics supports both sample procurement and bulk supply. To confirm specific part numbers, stock levels and real-time prices, please visit Mingjiada Electronics (https://www.integrated-ic.com/) for further supply details.