DK1203 AC-DC Switch Mode Power Controlling IC DIP-8

DK1203 AC-DC Switch Mode Power Controlling IC DIP-8 is a highly integrated, cost-effective power conversion solution designed specifically for small to medium-power offline switch-mode power supplies (SMPS). This controller IC simplifies the design of non-isolated or isolated flyback converters, consequently minimizing the external component count significantly. The DK1203 integrates both a high-voltage power MOSFET and a PWM controller into a single 8-pin package, making it exceptionally compact and efficient. Furthermore, its unique current mode control and variable frequency operation maximize overall system efficiency across a wide load range. Therefore, engineers utilize the DK1203 IC to design reliable and high-performance power adapters and auxiliary power supplies.

Key Features:

• High Integration: It combines a PWM controller and a 700V power MOSFET into one monolithic chip, simplifying PCB layout and reducing system cost.
• Wide Input Voltage Range: The IC handles AC input voltages from 85 V_AC to 265 V_AC, making it ideal for worldwide universal power applications.
• Excellent Regulation: The proprietary current mode control scheme delivers superb output voltage regulation and fast transient response.
• Built-in Protection Circuits: Includes comprehensive protection features like Over Temperature Protection (OTP), Over Current Protection (OCP), and Over Load Protection (OLP), ensuring rugged system reliability.
• Low Standby Power: The IC automatically enters a burst mode at light loads, consequently achieving extremely low standby power consumption (< 0.3W).
• Soft Start Function: Incorporates a soft start circuit, which minimizes stress on the MOSFET and reduces peak current during power-up.

Technical Specifications:

• Maximum Output Power (P_out): Up to 12 W (Isolated Flyback, Universal Input)
• Integrated MOSFET Voltage (V_DS): 700 V
• Switching Frequency (F_sw): Varies with load (typically 65 kHz at heavy load)
• Supply Voltage Range (V_CC): 8 V to 36 V
• Operating Temperature Range: −40°C to +125°C (Junction Temperature)
• Start-up Current: Low start-up current (≈ 10 μA) simplifies the startup power circuit design.

Mechanical Specifications:

• Package Style: DIP-8 (Dual In-line Package)
• Pin Material: Tinned Copper
• Mounting: Through-Hole Technology (THT)
• Moisture Sensitivity Level (MSL): MSL 3

Dimensions:

• Body Length: ≈ 9.8 mm
• Body Width: ≈ 6.5 mm
• Pin Pitch (Pin-to-Pin): 2.54 mm (0.1 inch)
• Row Spacing (Across the Body): 7.62 mm (0.3 inch)
• Overall Height: ≈ 3.3 mm

Pinout and Wiring:

• Pin 1 (GND): Connect to the primary side ground.
• Pin 2 (FB): Feedback Pin. Connect to the voltage regulation sensing circuit (e.g., via optocoupler cathode).
• Pin 3 (NC): No Connection.
• Pin 4 (V_CC): Supply Voltage Pin. Connect to the external bias capacitor.
• Pins 5, 6, 7, 8 (DRAIN): High-voltage MOSFET Drain terminal. Connect these pins directly to the primary coil of the transformer.
• Wiring Note: Ensure you minimize the loop area formed by the V_CC capacitor and the GND pin to reduce EMI.

Datasheet Reference:

• Download DK1203 AC-DC SMPS Controller Datasheet

Commonly Used in:

• Small Power Adapters: Used extensively in power bricks for routers, set-top boxes, and USB chargers.
• LED Lighting Drivers: Providing the isolated power supply for non-dimmable LED fixtures up to 12W.
• Auxiliary Power Supplies: Serving as the standby power source in large appliances or industrial control boards.

Applications:

• Home Appliances: Powering control boards and displays in small consumer electronics like electric kettles and coffee makers.
• Security Systems: Providing reliable power for surveillance cameras and alarm system modules.
• Metering Devices: Used in electricity meters and smart grid components that require constant, low-power monitoring.

Equivalent Models:

• PN8015: A similar high-voltage BJT-integrated controller, frequently used as a substitute in low-power flyback designs.
• OB2535: This is a common AC-DC switching regulator IC, however, verify its power rating and pin functions for direct replacement.
• TNY274-278 Series (Power Integrations): Functionally equivalent series (TinySwitch-III), but you will need to review the power level to select the exact matching part number.

Package Includes:

• 1 x DK1203 AC-DC Switch Mode Power Controlling IC DIP-8