NCP1565 Datasheet, PDF (1/2 Pages) ON Semiconductor – PWM Controller, Highly Integrated Dual-Mode Active Clamp

Product Overview
NCP1565: PWM Controller, Highly Integrated Dual-Mode Active Clamp
For complete documentation, see the data sheet
Product Description
The NCP1565 is a highly integrated dual-mode active-clamp PWM controller targeting next-generation high-density, high-
performance and small to medium power level isolated dc-dc converters for use in telecom and datacom industries. It can be
configured in either voltage mode control with input voltage feed-forward or peak current mode control. Peak current mode control
may be implemented with input voltage feed forward as well. Adjustable adaptive overlap time optimizes system efficiency based on
input voltage and load conditions.
This controller integrates all the necessary control and protection functions to implement an isolated active clamp forward or
asymmetric half-bridge converter. It integrates a high-voltage startup bias regulator. The NCP1565 has a line undervoltage detector,
cycle-by-cycle current limiting, line voltage dependent maximum duty ratio limit, and programmable overtemperature protection using
an external thermistor. It also includes a dual-function FLTSD pin used for communicating the presence of a fault but also for
shutting down the controller.
For complete datasheet please contact your local ON Semiconductor Sales office or [e-mail]
Features
• Both Voltage Mode Control and Current Mode Control
• Line feedforward
• Adaptive Overlap time Control
• Integrated 200V HV Startup
• Programmable Line Undervoltage Lockout (UVLO) with
Adjustable Hysteresis
• Cycle by Cycle Peak Current Limiting
• Overcurrent Protection Based on Average Current
• Programmable Duty Ratio Clamp
• Programmable Soft-Start
• Programmable Shutdown and Restart Delays
Benefits
• Flexible topology solution
• Stable constant crossover across input voltage range
• Extended ZVS across input & output operating conditions
• Lossless startup and reduced Vcc capacitor via dynamic
startup
• Safely limits operating input voltage range
• Increased converter robustness
• Precise output power limit
• Efficiently prevents transformer saturation
• Lowers components stress at startup
• Robustness and flexibility of design
Applications
• High Efficiency Isolated dc?dc Converters
• Server Power Supplies
• 24 V and 48 V Telecom systems
• 42 V Automotive Applications
End Products
• Telecom systems
• Servers
Part Electrical Specifications
Product
NCP1565MNTXG
Compliance Status
Topolog Control f_sw Typ Stand- UVLO
y
Mode (kHz) by Mode (V)
Pb-free
ProductPre Forward Current/ Up to Yes
Yes
view
Voltage 1.5 MHz
Halide free
Mode
Short
Circuit
Protecti
on
Yes
Latch
Yes
Soft
Start
Yes
V_CC Max Drive
(V)
Cap.
(mA)
Packag
e Type
20 V
2000 / QFN-24
3000