DPA424P-TL POWERINT [Power Integrations, Inc.], DPA424P-TL Datasheet

DPA424P-TL

Manufacturer Part Number

DPA424P-TL

Description

Highly Integrated DC-DC Converter ICs for Distributed Power Architectures

Manufacturer

POWERINT [Power Integrations, Inc.]

Datasheet

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DPA423-426

DPA-Switch Family

Highly Integrated DC-DC Converter ICs

for Distributed Power Architectures

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

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

• 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.

through-hole (P package) options for designs ≤35 W

limits gate drive voltage range from transformer winding

Product Highlights

™

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.

Table 1. Notes: 1. Maximum output power is limited by device internal

current limit. 2. See Applications Considerations section for complete

description of assumptions and for output powers with other input voltage

ranges. 3. For device dissipation of 1.5 W or below, use P or G packages.

Device dissipation above 1.5 W is possible only with R package. 4. See

Part Ordering Information. 5. Due to higher switching losses, the DPA425

may not deliver additional power compared to a smaller device.

Figure 1. Typical Forward Converter Application.

Total Device

V IN

Total Device

PRODUCT

Dissipation

DPA423

DPA424

DPA425

DPA426

DPA423

DPA424

DPA425

CIRCUIT

RESET/

CLAMP

36-75 VDC INPUT RANGE (FORWARD)

DPA-Switch

36-75 VDC INPUT RANGE (FLYBACK)

OUTPUT POWER TABLE

0.5 W 1 W 2.5 W

12 W 16 W

16 W 23 W 35 W

23 W 32 W 50 W 62 W

25 W 35 W 55 W 70 W 83 W 100 W

10 W 14.5 W 18 W

0.5 W

9 W

CONTROL

0.75 W

13 W

1 W

4 W

25.5 W 52 W

24 W

1.5 W

6 W

CIRCUIT

SENSE

January 2004

PI-2770-032002

2,4

Output

Power

18 W

35 W

70 W

13 W

26 W

Max

V O

Related parts for DPA424P-TL

DPA424P-TL Summary of contents

Page 1

DPA423-426 DPA-Switch 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 ...

Page 2

DPA423-426 Functional Block Diagram ......................................................................................................................................... 3 Pin Functional Description ........................................................................................................................................ 3 DPA-Switch Family Functional Description .............................................................................................................. 4 CONTROL (C) Pin Operation ................................................................................................................................. 4 Oscillator and Switching Frequency ....................................................................................................................... 5 Pulse Width Modulator & Maximum Duty Cycle ..................................................................................................... 6 Minimum Duty ...

Page 3

V C CONTROL ( SHUNT REGULATOR/ ERROR AMPLIFIER - + 5 (LIMIT) CURRENT LIMIT START ADJUST ON/OFF EXTERNAL CURRENT LIMIT ( LINE-SENSE ( OV/UV ...

Page 4

DPA423-426 DPA-Switch Family Functional Description DPA-Switch is an integrated switched mode power supply chip that converts a current at the control input to a duty cycle at the open drain output of a high voltage power MOSFET. During normal operation ...

Page 5

V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the duty cycle of the MOSFET from zero to the maximum value over approximately 5 ms. The high voltage current source is turned ...

Page 6

DPA423-426 Pulse Width Modulator and Maximum Duty Cycle The pulse width modulator implements voltage mode control by driving the output MOSFET with a duty cycle inversely proportional to the current into the CONTROL pin that is in excess of the ...

Page 7

CONTROL pin voltage reaches 5.8.V. If the power supply loses regulation before reaching the UV lower threshold, the device will enter auto-restart. At the end of each auto-restart cycle (S7), the UV comparator is ...

Page 8

DPA423-426 (typical), the CONTROL pin goes into the hysteretic mode of operation. In this mode, the CONTROL pin goes through alternate charge and discharge cycles between 4.8 V and 5.8 V (see CONTROL Pin Operation section above) and the IC ...

Page 9

Using Feature Pins FREQUENCY (F) Pin Operation The FREQUENCY pin is a digital input pin. Shorting the FREQUENCY pin to SOURCE pin selects the nominal switching frequency of 400 kHz (Figure 9) which is suited for most applications. For other ...

Page 10

DPA423-426 (Enabled) Output MOSFET Switching (Disabled) I (Default) LIMIT Current Limit -21.5 µA -25.5 µ Pin Voltage -250 -200 -150 -100 X Pin Current (µA) Note: These figures provide idealized functional characteristics with typical performance values. Please ...

Page 11

CONTROL Pin EXTERNAL CURRENT LIMIT (X) LINE-SENSE (L) Figure 8. LINE-SENSE (L), and EXTERNAL CURRENT LIMIT (X) Pin Input Simplified Schematic. DPA-Switch 230 µA (Negative Current Sense - ON/OFF, Current Limit Adjustment (Voltage Sense) 1 ...

Page 12

DPA423-426 Typical Uses of FREQUENCY (F) Pin + DC D Input CONTROL Voltage Figure 9. 400 kHz Frequency Operation. Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins + DC Input Voltage D L CONTROL ...

Page 13

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont Input CONTROL Voltage Figure 15. Externally Set Current Limit output or can be replaced by a manual ...

Page 14

DPA423-426 Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.) + 619 kΩ Input CONTROL Voltage Figure 21. Active-on Remote ON/OFF with LINE-SENSE and EXTERNAL CURRENT ...

Page 15

Application Examples µH IN 2.5 A 36-75 VDC R1 619 kΩ 1% C1, C2 & µF 100 CONTROL CONTROL S X VR1 SMBJ 18.2 kΩ 150 V IN *Optional components Figure ...

Page 16

DPA423-426 + VDC J1 MΩ 619 kΩ 200 V VDC C1 VR1 1 µF D SMAJ 100 V 150A CONTROL J1-2 ...

Page 17

R8 and R9 and is fed to the low voltage 1.24 V reference U3. Feedback compensation is provided by R6, R7 and C11 together with C4 and R4. Capacitor C10 provides a soft-finish characteristic, preventing output overshoot during start-up. ...

Page 18

DPA423-426 OUTPUT POWER TABLE 24-48 VDC RANGE (FLYBACK) Total Device Dissipation 0 PRODUCT DPA423 8 DPA424 DPA425 Table 6. Flyback Output Power ...

Page 19

Primary Side Connections The tab of DPA-Switch R package is the intended return path for the high switching currents. Therefore, the tab should be connected by wide, low impedance traces back to the input decoupling capacitor. The SOURCE pin should ...

Page 20

DPA423-426 Solder Side Component Side TOP VIEW DPA-Switch Maximize hatched copper area for optimum heat sinking Via between board layers V Figure 27. Layout Considerations for DPA-Switch Using R Package. Top Side PCB Bottom ...

Page 21

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 CONTROL Current ............................................... 100 mA LINE SENSE ...

Page 22

DPA423-426 Parameter Symbol CONTROL FUNCTIONS (cont.) Softstart Time t SOFT PWM Gain DC reg PWM Gain Temperature Drift Dynamic Z Impedance C Dynamic Impedance Temperature Drift CONTROL Pin Internal Filter Pole SHUTDOWN/AUTO-RESTART CONTROL Pin I C(CH) Charging Current Charging Current ...

Page 23

Parameter Symbol LINE-SENSE (L) AND EXTERNAL CURRENT LIMIT (X) INPUTS (cont) Line Overvoltage or Remote ON/ I OFF Threshold OV Current and Hysteresis (L pin) Remote ON/OFF Negative Thresh- I REM old Current and Hysteresis (X pin) L pin Short ...

Page 24

DPA423-426 Parameter Symbol FREQUENCY (F) INPUT FREQUENCY Pin V Threshold Voltage F FREQUENCY Pin I Input Current F FREQUENCY Pin t Delay Time delay(VF) CIRCUIT PROTECTION Self Protection Current Limit I LIMIT (See Note B) Initial Current Limit I INIT ...

Page 25

Parameter Symbol OUTPUT (cont) OFF-State Drain I DSS Leakage Current Breakdown BV Voltage DSS t Rise Time R Fall Time t F SUPPLY VOLTAGE CHARACTERISTICS DRAIN Supply Voltage Shunt Regulator V C(SHUNT) Voltage Shunt Regulator Temperature Drift l CONTROL CD1 ...

Page 26

DPA423-426 VOLTAGE Figure 29. Duty Cycle Measurement. 120 100 Dynamic 1 = Impedance Slope CONTROL Pin Voltage (V) Figure 30. CONTROL Pin I-V Characteristic 470 Ω 0-15 V NOTE: ...

Page 27

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS The following precautions should be followed when testing DPA-Switch by itself outside of a power supply. The schematic shown in Figure 32 is suggested for laboratory testing of DPA-Switch. When the DRAIN ...

Page 28

DPA423-426 Typical Performance Characteristics (cont.) 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - 100 125 150 Junction Temperature (°C) Figure 35. Frequency vs. Temperature. 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - ...

Page 29

Typical Performance Characteristics (cont.) 1 1.375 - I x 843 kΩ 1.4 ≤ ≤ -200 µA I -25 µA X 1.2 1.0 0.8 0.6 0.4 0.2 0 -225 -175 -125 -250 -200 -150 -100 EXTERNAL CURRENT ...

Page 30

DPA423-426 Typical Performance Characteristics (cont Scaling Factors °C DPA423 = 0.18 CASE 16 DPA424 = 0.36 DPA425 = 0.72 DPA426 = 1. CASE ...

Page 31

PART ORDERING INFORMATION DPA 423 DPA-Switch Product Family Series Number G Plastic Surface Mount DIP P Plastic DIP R Plastic TO-263-7C (available only with TL option) Package/Lead Options TL Tape & Reel, (G Package: 1000 min., R ...

Page 32

DPA423-426 DIM inches mm A 0.367-0.387 9.32-9.83 B 0.240-0.260 6.10-6.60 C 0.125-0.145 3.18-3.68 G 0.015-0.040 0.38-1.02 H 0.120-0.140 3.05-3.56 J1 0.057-0.068 1.45-1.73 J2 0.014-0.022 0.36-0.56 K 0.008-0.015 0.20-0.38 L 0.100 BSC 2.54 BSC M 0.030 (MIN) 0.76 (MIN) N 0.300-0.320 ...

Page 33

Ref .024 (0.61) .034 (0.86) .315 (8.00) .380 (9.65) .638 (16.21) .050 (1.27) .038 (0.97) TO-263-7C .245 (6.22) min. .225 (5.72) min. .580 (14.73) ...

Page 34

DPA423-426 K 34 1/04 ...

Page 35

Revision Notes F 1) Final release data sheet Updated Figure 25 and text description Corrected missing text on page 9 and corrected Table 4. 2) Updated R package description. 3) Revised thermal impedances (θ 4) Updated ...

Page 36

DPA423-426 For the latest updates, visit our Web site: www.powerint.com PATENT INFORMATION Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from ...

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