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Description
M51995A is the primary switching regulator controller which is especially designed to get the regulated DC voltage from AC power supply.
This IC can directly drive the MOS-FET with fast rise and fast fall output pulse.
Type M51995A has the functions of not only high frequency OSC and fast output drive but also current limit with fast response and high sensibility so the true “fast switching regulator” can be realized.
It has another big feature of current protection to short and over current, owing to the integrated timer-type protection circuit, if few parts are added to the primary side.
The M51995A is equivalent to the M51977 with externally re-settable OVP (over voltage protection) circuit.
Features
● 500 kHz operation to MOS FET
— Output current : ±2A
— Output rise time 60ns, fall time 40ns
— Modified totempole output method with small through current
● Compact and light-weight power supply
— Small start-up current : 90μA typ.
— Big difference between “start-up voltage” and “stop voltage” makes the smoothing capacitor of the power input section small.
Start-up threshold 16V, stop voltage 10V
— Packages with high power dissipation are used to with-stand the heat generated by the gate-drive current of MOS FET.
16-pin DIP, 20-pin SOP 1.5W (at 25℃)
● Simplified peripheral circuit with protection circuit and built-in large-capacity totempole output
— High-speed current limiting circuit using pulse-by-pulse method (Two system of CLM+pin, CLM?pin)
— Protection by intermittent operation of output over current : Timer protection circuit — Over-voltage protection circuit with an externally re-settable latch (OVP)
— Protection circuit for output miss action at low supply voltage (UVLO)
● High-performance and highly functional power supply
— Triangular wave oscillator for easy dead time setting
Application
Feed forward regulator, fly-back regulator
Recommended Operating Conditions
● Supply voltage range: 12 to 36V
● Operating frequency: less than 500kHz
● Oscillator frequency setting resistance
— T-ON pin resistance RON: 10k to 75k?
— T-OFF pin resistance ROFF: 2k to 30k?
Block Diagram
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
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Substitute (equivalent) Product
| Substitute Product | Description |
|---|---|
| UC3843N | High-performance current mode controller for switch-mode power supplies, providing an internal oscillator, a precise reference, and a low supply current. Widely used in off-line and DC to DC converter applications. |
| KA5L0380RTU | Fairchild's integrated switching regulator offering higher efficiency and protection features. Suitable for use in flyback converters. |
| MC34063 | DC to DC converter controller capable of step-up, step-down, and inverting applications. Incorporates a wide range of features like current limiting, output switch, and adjustable reference. |
| TL494 | Pulse-width-modulation control circuit primarily used for switching power supplies, covering both current and voltage mode control. Offers various integrated functions for greater versatility in design. |
| LM2576 | A step-down voltage regulator from Texas Instruments, providing high efficiency and reduced complexity for applications requiring a fixed 3.3V or adjustable output. Ideal for use in voltage regulation and power management. |
Product Usage
The M51995AFP is a Power Factor Correction (PFC) control IC typically used in circuits that require correction and improvement of the power factor in AC-DC conversion systems. Some common applications and circuits where the M51995AFP might be used include:
Switching Power Supplies (SMPS): These power supplies often use PFC circuits to minimize the phase difference between the voltage and current, thereby improving efficiency and reducing harmonic distortion.
LED Drivers: High-efficiency LED drivers utilize PFC to ensure that the power drawn from the AC mains is used more effectively, leading to improved longevity and reliability of the LED lighting systems.
Consumer Electronics: Devices like televisions, monitors, and audio systems use PFC to comply with regulatory standards for power consumption and electromagnetic interference (EMI).
Industrial Power Supplies: Industrial equipment such as motor drives, welding machines, and other heavy-duty electrical equipment leverage PFC to enhance power quality and system efficiency.
Uninterruptible Power Supplies (UPS): UPS systems use PFC to ensure that they can handle the power requirements of connected devices more effectively, especially under varying load conditions.
Computing Equipment: Servers, desktop computers, and other high-power computing devices incorporate PFC to reduce power loss and improve overall energy efficiency.
The M51995AFP is specifically designed to manage and control the PFC stage in these applications, helping to ensure that the power factor is as close to unity as possible, thereby improving the overall performance and efficiency of the power conversion process.
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| Express | Standard Shipping | Express (0.5kg) | Standard Shipping (0.05kg) | ||
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Returns are normally accepted when completed within 90 days from the date of the parcel delivered.
Defective ( Please provide a third party quality report of nonconforming products)
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Warranty
All UTSOURCE purchases have a 90 days money back return policy, plus a 100 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
M51995AFP
M51995AFP has several brands around the world that may have alternate names for M51995AFP due to regional differences or acquisition. M51995AFP may also be known as the following names:
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