Datasheet ADP1074 (Analog Devices) - 3

Data Sheet ADP1074 GENERAL DESCRIPTION
The ADP1074 is a current mode, fixed frequency, active clamp, The secondary side pins provide functions for differential output synchronous forward control er designed for isolated dc to dc voltage sensing, overvoltage, power good, tracking, and power supplies. Analog Devices proprietary iCouplers® are programmable light load mode setting. integrated in the ADP1074 to eliminate the bulky signal trans- The feedback signal and timing of synchronous rectifier pulse- formers and optocouplers that transmit signals over the isolation width modulations (PWMs) are transmitted from primary to boundary. Integrating the iCouplers reduces system design secondary or from secondary to primary sides through the complexity, cost, and component count and improves overal iCouplers using a proprietary transmission scheme. system reliability. With the integrated isolators and metal-oxide semiconductor field effect transistor (MOSFET) drivers on both The ADP1074 also offers features such as input current the primary and the secondary side, the ADP1074 offers a compact protection, undervoltage lockout (UVLO), precision enable system level design and yields a higher efficiency than a non- with adjustable hysteresis, overtemperature protection (OTP), synchronous forward converter at heavy loads. and power saving light load mode (LLM). The primary side pins provide functions for programming the switching frequency, maximum duty cycle, external frequency synchronization, and slope compensation.
Table 1. Related Products1 Part Temperature Lead Free Finish Tape and Reel2 Marking Package Description Range3
LT8672EMS#WPBF LT8672EMS#WTRPBF LTGYT 10-lead plastic MSOP −40°C to +125°C LT8672IMS#WPBF LT8672IMS#WTRPBF LTGYT 10-lead plastic MSOP −40°C to +125°C LT8672JMS#WPBF LT8672JMS#WTRPBF LTGYT 10-lead plastic MSOP −40°C to +150°C LT8672HMS#WPBF LT8672HMS#WTRPBF LTGYT 10-lead plastic MSOP −40°C to +150°C LT8672EDDBM#WTRMPBF LT8672EDDBM#WTRPBF LHJR 10-lead, 3 mm × 2 mm, plastic side wettable −40°C to +125°C DFN package LT8672IDDBM#WTRMPBF LT8672IDDBM#WTRPBF LHJR 10-lead, 3 mm × 2 mm, plastic side wettable −40°C to +125°C DFN package LT8672JDDBM#WTRMPBF LT8672JDDBM#WTRPBF LHJR 10-lead, 3 mm × 2 mm, plastic side wettable −40°C to +150°C DFN package 1 Versions of these devices are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact a local Analog Devices account representative for specific product ordering information and to obtain the specific automotive reliability reports for these models. 2 Some packages are available in 500 unit reels through designated sales channels. These versions feature the #TRMPBF suffix. 3 Contact the factory for devices specified with wider operating temperature ranges. The temperature grade is identified by a label on the shipping container. Rev. C | Page 3 of 32 Document Outline FEATURES APPLICATIONS SIMPLIFIED BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY GENERAL DESCRIPTION SPECIFICATIONS INSULATION AND SAFETY RELATED SPECIFICATIONS REGULATORY INFORMATION DIN V VDE V 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS DIN V VDE V 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION DETAILED BLOCK DIAGRAM PRIMARY SIDE SUPPLY, INPUT VOLTAGE, AND LDO SECONDARY SIDE SUPPLY AND LDO PRECISION ENABLE SOFT START PROCEDURE OUTPUT VOLTAGE SENSING AND FEEDBACK LOOP COMPENSATION AND STEADY STATE OPERATION SLOPE COMPENSATION INPUT/OUTPUT CURRENT-LIMIT PROTECTION TEMPERATURE SENSING FREQUENCY SETTING (RT PIN) MAXIMUM DUTY CYCLE FREQUENCY SYNCHRONIZATION SYNCHRONOUS RECTIFIER (SR) DRIVERS OUTPUT OVERVOLTAGE PROTECTION (OVP) ACTIVE CLAMP (PGATE) LEADING EDGE BLANKING GATE DELAY AND SR DEAD TIME LIGHT LOAD MODE (LLM) AND SR PHASE IN EXTERNAL START-UP CIRCUIT SOFT STOP POWER GOOD OCP/FEEDBACK RECOVERY OUTPUT VOLTAGE TRACKING REMOTE SYSTEM RESET OCP COUNTER INSULATION LIFETIME LAYOUT GUIDELINES TYPICAL APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE NOTES