Thursday, January 14, 2016

HARMAN KARDON DMC250 -230 DIGITAL MEDIA CENTER Power supply circuit – ICE3B0365 - DVD Player Repair and Service

                                                  Category: DVD media player repair and service 

Contents of this article 

  • Power supply circuit diagram 
  • ICE3B0365 Description 


HARMAN KARDON DMC250 -DMC230

ICE3B0365 Off-Line SMPS Current Mode Controller
Description
The CoolSET F3(Jitter version) meets the requirements for Off-Line Battery Adapters and low cost SMPS for the lower power range. By use of a BiCMOS technology a wide VCC range up to 26V is provided. This covers the changes in the auxiliary supply voltage if a CV/CC regulation is implemented on the secondary side. Furthermore an Active Burst Mode is integrated to fullfill the lowest Standby Power Requirements <100mW at no load and Vin = 270VAC. As during Active Burst Mode the controller is always active there is an immediate response on load jumps possible without any black out in the SMPS. In Active Burst Mode the ripple of the output voltage can be reduced <1%. Furthermore Auto Restart Mode is entered in case of Overtemperature, VCC Overvoltage, Output Open loop or Overload and VCC Undervoltage. By means of the internal precise peak current limitation, the dimension of the transformer and the secondary diode can be lowered which leads to more cost efficiency.
Features
# 650V Avalanche Rugged CoolMOS with built in switchable Startup Cell
# Active Burst Mode for lowest Standby Power
@ light load controlled by Feedback Signal
# Fast Load Jump Response in Active Burst Mode
# 67 kHz fixed Switching Frequency
# Auto Restart Mode for Over temperature Detection
# Auto Restart Mode for Overvoltage Detection
# Auto Restart Mode for Overload and Open Loop
# Auto Restart Mode for VCC Undervoltage
# User defined Soft Start
# Minimum of external Components required
# Max Duty Cycle 75%
# Overall Tolerance of Current Limiting < ±5%
# Internal Leading Edge Blanking
# BiCMOS technology provides wide VCC Range
# Frequency Jittering for Low EM
PIN CONFIGURATION 
Pin
Symbol
Function
1
SoftS
Soft-Start
2
FB
Feedback
3

CS

Current Sense/
650V1) CoolMOS® Source
4
Drain
650V1) CoolMOS® Drain
5
Drain
650V1) CoolMOS® Drain
6
N.C.
Not Connected
7
VCC
Controller Supply Voltage
8
GND
Controller Ground
Pin Functionality
SoftS (Soft Start, Auto Restart & Frequency Jittering Control)
The SoftS pin combines the function of Soft Start during Start Up and error detection for Auto Restart Mode. These functions are implemented and can be adjusted by means of an external capacitor at SoftS to ground. This capacitor also provides an adjustable blanking window for high load jumps, before the IC enters into Auto Restart Mode. Furthermore this pin is also used to control the period of frequency jittering during normal load.
FB (Feedback)
The information about the regulation is provided by the FB Pin to the internal Protection Unit and to the internal PWM-Comparator to control the duty cycle. The FBSignal controls in case of light load the Active Burst Mode of the controller.
CS (Current Sense)
The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the integrated CoolMOS. If CS reaches the internal threshold of the Current Limit Comparator, the Driver output is immediately switched off. Furthermore the current information is provided for the PWMComparator to realize the Current Mode.
Drain (Drain of integrated CoolMOS)
Pin Drain is the connection to the Drain of the internal CoolMOS.
VCC (Power supply)
The VCC pin is the positive supply of the IC. The operating range is between 10.3V and 26V.
GND (Ground)
The GND pin is the ground of the controller.
POWER SUPPLY CIRCUIT 
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