Datasheet ADP1071-1, ADP1071-2 (Analog Devices)

Isolated Synchronous Flyback Controller with Integrated
i
Coupler Preliminary Technical Data ADP1071-1 /ADP1071-2 FEATURES GENERAL DESCRIPTION Current Mode Controller for flyback topology
The ADP1071-1/ADP1071-21 is a PWM current mode fixed
ADP1071-1: Programmable LLM or CCM for high V IN
frequency synchronous flyback control er designed for isolated
applications
DC-to-DC power supplies. Analog Devices, Inc., proprietary
ADP1071-2: Forced CCM operation
iCoupler devices are integrated in the ADP1071-1/ADP1071-2
Programmable slope compensation
to eliminate the bulky signal transformers and opto-couplers
Integrated 5 kV isolation with Analog Devices i Coupler
while reducing system design complexity, cost and component
technology
count, and improving overall system reliability. With the
Wide voltage supply range
integrated isolators and drivers on both the primary and
Primary V : Upto 60 V (ADP1071-2 only) DD
secondary, the ADP1071-1/ADP1071-2 offers a compact system
Secondary V : Upto 36 V DD2
level design and yields a higher efficiency than a diode rectified
Integrated 1A primary side MOSFET driver for
flyback converter at heavy loads.
Integrated 1A secondary side MOSFET driver for
Output regulation is achieved by sensing the output voltage on
synchronous rectification
the secondary side, where the feedback and the PWM signals
Integrated error amplifier and < 1% accurate reference
are transmitted between the primary and secondary through
voltage
the iCouplers.
Programmable frequency range: 50 kHz – 600 kHz Duty cycle clamp limit 85%
The ADP1071-1/ADP1071-2 is offered in the 16L SOIC_W
Programmable soft start and soft start from pre-charged
with an isolation voltage rating of 5 kVRMS. The ADP1071-2 is
load
designed for isolated DC-DC applications typical y with input
Protection features such as short circuit,
voltage less than 36V, and the ADP1071-1 targets high input
output overvoltage, and over temperature protection
voltage applications, where the DC input voltage can exceed
Power saving light load mode using MODE pin (ADP1071-1
60V.
only)
The ADP1071-1/ADP1071-2 offers features such as input
Cycle-by-cycle input overcurrent protection
current protection, output over-voltage protection (OVP),
Precision enable UVLO with hysteresis
under voltage lockout (UVLO), precision enable with adjustable
Frequency synchronization
hysteresis, over temperature protection (OTP) and light-load
Power Good pin for system flagging
power saving mode (LLM).
Available in 24-pin SOIC_W package APPLICATIONS Isolated DC/DC or AC/DC Power conversion Telecom, Industrial Small Cell PoE Powered Device Enterprise switches/routers
1 Protected by U.S. Patent US 7,075,329 B2.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS TYPICAL APPLICATION CIRCUITS SPECIFICATIONS REGULATORY INFORMATION ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS SIMPLIFIED BLOCK DIAGRAM APPLICATIONS INFORMATION INSULATION LIFETIME OUTLINE DIMENSIONS