NCP1565_16 Datasheet, PDF (1/31 Pages) ON Semiconductor – Highly Integrated Dual-Mode Active Clamp PWM Controller

NCP1565
Highly Integrated
Dual-Mode Active Clamp
PWM Controller
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 FLT/SD pin
used for communicating the presence of a fault but also for shutting
down the controller.
www.onsemi.com
QFN24
MN SUFFIX
CASE 485CW
MARKING
DIAGRAM
1
1565
ALYWG
G
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
General Features
• Support Voltage Mode Control and Peak Current Mode Control
• Line Feedforward
• Adaptive Overlap time Control for Improved Efficiency
• Integrated 120 V High Voltage Startup Circuit
• Programmable Line Undervoltage Lockout (UVLO) with Adjustable
24 23 22 21 20 19
RAMP 1
SS ₂
DLMT ₃
18 ^REFA
17 FLT/SD
16 _OUTA
Hysteresis
DT ₄
15 PGND
• Cycle by Cycle Peak Current Limiting
RT ₅
14 OUTM
• Overcurrent Protection Based on Average Current
• Short Circuit Protection
• Programmable Duty Ratio Clamp
AGND ₆
13 VCC
7 8 9 10 11 12
• Programmable Soft−Start
• Programmable Shutdown and Restart Delays
• Programmable External Overtemperature Protection Using
Thermistor
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 30 of this data sheet.
• FLT/SD pin Used for Fault reporting and Shutdown Input
• Programmable Oscillator with 1.5 MHz Maximum Frequency
• 5 V/2% Voltage Reference
• Main Switch Drive Capability of −2 A/3 A
• Active Clamp Switch Drive Capability of −2 A/1 A
• V_CC Range: from 6.5 V to 20 V
• These Devices are Pb−Free, Halogen Free/BFR Free
Typical Applications
• High Efficiency Isolated dc−dc Converters
• Server Power Supplies
• 24 V and 48 V Telecom systems
• 42 V Automotive Applications
and RoHS Compliant
© Semiconductor Components Industries, LLC, 2016
1
January, 2016 − Rev. 4
Publication Order Number:
NCP1565/D