Sunday, December 27, 2015

LG BD370 POWER SUPPLY CIRCUIT

LG BD370 

278R12 VOLTAGE REGULATOR 
Description
The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipment. It provides a constant voltage power source in a TO-220 4-lead full-mold package. The dropout voltage is below 0.5 V in full-rated current (2 A). This regulator has peak current protection, thermal shutdown, and over-voltage protection.
KA278RXXC-Series (33 / 05 / 12)
• 3.3 V, 5 V, 12 V Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
• Output Disable Function
KA278RA05C
• Nominal 5 V Output without Adjusting
• Output Adjustable between 1.27 V and 32 V
• 2 A Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
STR W6251 SMPS DRIVER 
Description
STR-W6200D series are power ICs for switching power supplies, incorporating a power MOSFET and a current mode PWM controller IC in one package. Including a startup circuit and a standby function in the controller, the product achieves low power consumption, low standby power, and high cost-effectiveness in power supply systems, while reducing external components.
Features and Benefits
TO-220 fully-molded package with 6 pins
Current mode PWM control
PWM and frequency modulation functions: reduces EMI noise, simplifies EMI filters, and cuts cost by external part reduction
Built-in Slope Compensation circuit: avoids subharmonic oscillation
Automatic Standby Mode function (Input Power < 40 mW at no load)
Normal operation: PWM mode
Light load operation: Standby mode (burst oscillation)
Built-in Audible Noise Suppression function during Standby mode
Built-in startup circuit: reduces power consumption in standby operation, and eliminates external components
Bias-Assist function: improves startup operation, suppresses VCC pin voltage drop in operation, and allows use of smaller VCC capacitor
Built-in Leading Edge Blanking function
Protection Functions:
Overcurrent Protection function (OCP); pulse-by-pulse, built-in compensation circuit to minimize OCP point variation on AC input voltage
Applications:
Switching power supplies for electronic devices such as:
• White goods
• Consumer electronics
• Office automation
• Industrial equipment
• Communication equipment
LVT817 OPTO COUPLER 
Features
Current transfer ratio
(CTR : MIN. 50% at IF=5mA, VCE=5V)
High input-output isolation voltage:
(VISO : 5,000Vrms)
Compact dual-in-line package
LTV-817 : 1-channel type
LTV-827 : 2-channel type
LTV-847 : 4-channel type
UL approved (No. E113898)
TUV approved (No. R9653630)
CSA approved (No. CA91533-1)
FIMKO approved (No. 202634)
NEMKO approved (No. P98101945)
DEMKO approved (No. 307857)
SEMKO approved (No. 9832157/01-03)
VDE approved (No. 094722)
Options available :
-Leads with 0.4"(10.16mm)spacing (M Type)
-Leads bends for surface mounting(S Type)
-Tape and Reel of Type I for SMD(Add"-TA"Suffix)
-Tape and Reel of Type II for SMD(Add"-TA1"Suffix)
-VDE 0884 approvals (Add"-V"Suffix)
Applications
1. Computer terminals.
2. System appliances, measuring instruments.
3. Registers, copiers, automatic vending machines.
4. Electric home appliances such as fan heaters, etc.
5. Signal transmission between circuits of different
potentials and impedances.
POWER SUPPLY SCHEMATIC 
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