LX1570MY

LX1570MY Datasheet

LX1570 / LX1571

Part	Datasheet
LX1570MY	LX1570MY (pdf)

Related Parts	Information
LX1570CM	LX1570CM
LX1571IDM	LX1571IDM
LX1571IM	LX1571IM
LX1571MY	LX1571MY
LX1570IM	LX1570IM
LX1571CM	LX1571CM
LX1571CDM	LX1571CDM
LX1570CDM	LX1570CDM
LX1570IDM	LX1570IDM

PDF Datasheet Preview
INFINITE POWER OF INNOVATION Not Recommended For new Design LX1570 / LX1571 PHASE MODULATED AC SYNCHRONOUS-SIDE CONTROLLER PRELIMINARY DATA SHEET The LX1570/71 series of controller ICs are only approach a certain maximum duty cycle, designed to provide all control functions in a limited by the minimum delay and the magnetic secondary-side regulator for isolated auxiliary or BH loop characteristic of the Mag Amp core. secondary power supplies. Auxiliary or This forces an increase in the size of the main secondary-side controllers are used in a variety transformer as well as the output inductor, of applications including multiple output off-line resulting in higher overall system cost. The power supplies, commonly found in desktop LX1570/71 eliminates all the disadvantages of computers, as well as telecommunications the Mag Amp approach as well as improving applications. Although they can be used in all system performance and reducing overall secondary output applications requiring system cost. The LX1570/71 is a current mode precision regulation, they are mainly optimized controller IC that controls the duty cycle of a for outputs delivering more than 3A current switch in series with the secondary AC output of where standard three-terminal regulators lack the power transformer in buck-derived desired efficiency. For these applications, the applications, such as forward or bridge Mag Amp regulators have traditionally been topologies. It offers features such as 100% duty used. However, Mag Amps have several cycle operation for maximum energy transfer, disadvantages. First, because they have to pulse-by-pulse and hiccup current limiting with withstand the maximum input voltage during a long off-time between the cycles for reduced short-circuit condition, they are "over designed", power dissipation, high-frequency operation for typically by 2 times, increasing the cost and size smaller magnetics, soft start, and current mode of the power supply. Second, Mag Amps are control for excellent dynamic response. inherently leading edge modulators, so they can IMPORTANT For the most current data, consult MICROSEMI’s website: PRODUCT HIGHLIGHT Aux Output 12V/8A KEY FEATURES - REPLACES COSTLY MAG-AMP CORES WITH A LOW ONRESISTANCE MOSFET - LOOK-AHEAD SWITCHINGTM ENSURES SWITCH TURN ON BEFORE THE AC INPUT TO ACHIEVE 100% ENERGY TRANSFER - LOWER OVERALL SYSTEM COST - LOWER PEAK CURRENT STRESS ON THE PRIMARY SWITCH - ALLOWS HIGHER OPERATING FREQUENCY AND SMALLER OUTPUT INDUCTOR - EASY SHORT-CIRCUIT PROTECTION - CURRENT MODE APPROACH ACHIEVES EXCELLENT DYNAMIC RESPONSE - SECONDARY-SIDE REGULATOR IN OFF-LINE POWER SUPPLIES - COMPUTER POWER SUPPLIES, 3.3V OUTPUT FOR NEW LOW-VOLTAGE PROCESSORS AND MEMORIES - TELECOMMUNICATION AND MILITARY DC/DC CONVERTERS OUT DRV C.S. LX1571 COMP S.S. Available Options Per Part# Part # C.L. Threshold C.S. Option Application LX1570

PDF Datasheet Preview

INFINITE POWER OF INNOVATION

Not Recommended For new Design

LX1570 / LX1571

PHASE MODULATED AC SYNCHRONOUS-SIDE CONTROLLER

PRELIMINARY DATA SHEET

The LX1570/71 series of controller ICs are only approach a certain maximum duty cycle, designed to provide all control functions in a limited by the minimum delay and the magnetic secondary-side regulator for isolated auxiliary or BH loop characteristic of the Mag Amp core. secondary power supplies. Auxiliary or This forces an increase in the size of the main secondary-side controllers are used in a variety transformer as well as the output inductor, of applications including multiple output off-line resulting in higher overall system cost. The power supplies, commonly found in desktop LX1570/71 eliminates all the disadvantages of computers, as well as telecommunications the Mag Amp approach as well as improving applications. Although they can be used in all system performance and reducing overall secondary output applications requiring system cost. The LX1570/71 is a current mode precision regulation, they are mainly optimized controller IC that controls the duty cycle of a for outputs delivering more than 3A current switch in series with the secondary AC output of where standard three-terminal regulators lack the power transformer in buck-derived desired efficiency. For these applications, the applications, such as forward or bridge Mag Amp regulators have traditionally been topologies. It offers features such as 100% duty used. However, Mag Amps have several cycle operation for maximum energy transfer, disadvantages. First, because they have to pulse-by-pulse and hiccup current limiting with withstand the maximum input voltage during a long off-time between the cycles for reduced short-circuit condition, they are "over designed", power dissipation, high-frequency operation for typically by 2 times, increasing the cost and size smaller magnetics, soft start, and current mode of the power supply. Second, Mag Amps are control for excellent dynamic response. inherently leading edge modulators, so they can

IMPORTANT For the most current data, consult MICROSEMI’s website:

PRODUCT HIGHLIGHT

Aux Output 12V/8A

KEY FEATURES
- REPLACES COSTLY MAG-AMP

CORES WITH A LOW ONRESISTANCE MOSFET
- LOOK-AHEAD SWITCHINGTM

ENSURES SWITCH TURN ON BEFORE THE AC INPUT TO ACHIEVE 100% ENERGY TRANSFER
- LOWER OVERALL SYSTEM

COST
- LOWER PEAK CURRENT

STRESS ON THE PRIMARY SWITCH
- ALLOWS HIGHER OPERATING

FREQUENCY AND SMALLER OUTPUT INDUCTOR
- EASY SHORT-CIRCUIT

PROTECTION
- CURRENT MODE APPROACH

ACHIEVES EXCELLENT DYNAMIC RESPONSE
- SECONDARY-SIDE

REGULATOR IN OFF-LINE POWER SUPPLIES
- COMPUTER POWER

SUPPLIES, 3.3V OUTPUT FOR NEW LOW-VOLTAGE PROCESSORS AND MEMORIES
- TELECOMMUNICATION AND

MILITARY DC/DC CONVERTERS

OUT DRV

C.S.

LX1571

COMP

S.S.

Available Options Per Part#

Part #

C.L. Threshold

C.S. Option

Application

LX1570

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Datasheet ID: LX1570MY 649003