DPA424R Integrated Circuit Chip Highly Integrated DC-DC Converter ICs

DPA423-426

DPA-Switch^TM Family

Highly Integrated DC-DC Converter ICs for Distributed Power Architectures

Product Highlights

Highly Integrated Solution

• Eliminates 20-50 external components–saves space, cost

• Integrates 220 V high frequency MOSFET, PWM control

• Lower cost plastic DIP surface mount (G package) and through-hole (P package) options for designs ≤35 W

Superior Performance and Flexibility

• Eliminates all external current sensing circuitry

• Built-in auto-restart for output overload/open loop protection

• Pin selectable 300/400 kHz fixed frequency

• Wide input (line) voltage range: 16-75 VDC

• Source connected tab reduces EMI

• Line under-voltage (UV) detection: meets ETSI standards

• Line overvoltage (OV) shutdown protection

• Low cost synchronous rectification: line UV/OV shut down limits gate drive voltage range from transformer winding

• Fully integrated soft-start for minimum stress/overshoot

• Externally programmable current limit

• Supports forward or flyback topology

• Cycle skipping: regulation to zero load without pre-load

• Hysteretic thermal shutdown for automatic fault recovery

EcoSmart - Energy Efficient

• Extremely low consumption at no load

• Cycle skipping at light load for high standby efficiency

Applications

• Telco central office equipment: xDSL, ISDN, PABX, etc.

• Distributed power architectures (24 V/48 V bus, etc.)

• Digital feature phones, VoIP phones, PoE

• Industrial controls (24 V/48 V)

Description

The DPA-Switch IC family introduces a highly integrated solution for DC-DC conversion applications in the 16-75 VDC input range.

DPA-Switch uses the same proven topology as TOPSwitch, cost effectively integrating the high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a single CMOS chip. High performance features are enabled with three user configurable pins.

The following transparent or built-in features are also provided: soft-start, cycle skipping down to zero load and hysteretic thermal shutdown. In addition, all critical parameters (i.e. current limit, frequency, PWM gain) have tight temperature and absolute tolerance, to simplify design and optimize system cost.

ABSOLUTE MAXIMUM RATINGS^{(1, 4)}

DRAIN Voltage ............................................. -0.3 to 220 V

DRAIN Peak Current: DPA423 ............................... 1.75 A

                                  DPA424 ................................. 3.5 A

                                  DPA425 .................................... 7 A

                                  DPA426 ................................. 9.6 A

CONTROL Voltage .......................................... -0.3 to 9 V

CONTROL Current ...............................................100 mA

LINE SENSE Pin Voltage ................................. -0.3 to 9 V

EXTERNAL CURRENT LIMIT Pin Voltage ........ -0.3 to 9 V

FREQUENCY Pin Voltage................................. -0.3 to 9 V

Storage Temperature ................................... -65 to 150 °C

Operating Junction Temperature ⁽²⁾ ............. -40 to 150 °C

Lead Temperature ⁽³⁾ ............................................. 260 °C

Notes:

1. All voltages referenced to SOURCE, T_A = 25 °C.

2. Normally limited by internal circuitry.

3. 1/16" from case for 5 seconds.

4. Maximum ratings specified may be applied, one at a time, without causing permanent damage to the product. Exposure to Absolute Maximum Rating conditions for extended periods of time may affect product reliability.

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