dpa422 Power Integrations, Inc., dpa422 Datasheet
dpa422
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dpa422 Summary of contents
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... W DPA424 DPA425 DPA426 36-75 VDC Input Range (Flyback) Total Device 3 Dissipation 0 Product DPA422 6.5 W 9.0 W DPA423 DPA424 10 W 14.5 W DPA425 - 6 - Table 1. Output Power Table. ® , Notes: 1. Maximum output power is limited by device internal current limit. ...
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... DPA422-426 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 ........................................................................................................ 5 Minimum Duty Cycle and Cycle Skipping ................................................................................................................. 6 Error Amplifi er .......................................................................................................................................................... 6 On-chip Current Limit with External Programmability ................................................................................................ 6 Line Under-Voltage Detection (UV) ...
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... COMPARATOR CYCLE SKIPPING SOURCE (S) Pin: Output MOSFET source connection for the power return. Primary side control circuit common and reference point. (TO-263-7C) ) reduction, MAX Figure 2. Pin Confi guration (Top View). DPA422-426 INTERNAL SUPPLY - + CURRENT LIMIT COMPARATOR CONTROLLED TURN-ON GATE DRIVER S ...
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... DPA422-426 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 the duty cycle of the power MOSFET decreases linearly with increasing CONTROL pin current as shown in Figure 4 ...
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... MOSFET. The pulse width modulator resets the latch, turning off the output MOSFET. Note that a minimum current must be driven into the CONTROL pin before the duty cycle begins to change DPA422-426 4 5.8 V PI-3867-050602 5 ...
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... DPA422-426 The maximum duty cycle set at a default maximum MAX value of 75% (typical). However, by connecting the LINE-SENSE to the DC input bus through a resistor with appropriate value, the maximum duty cycle can be made to decrease from 75% to 33% (typical) as shown in Figure 7 when input line voltage ...
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... Figure 24). Please refer to Figure 6 for the timing waveforms of synchronization operation. ≥ 128 kHz; t ≤ 7.7 μs; 120 ns ≤ SYNC OFF OFF DPA422-426 ≤ 2250 ns for f = 400 kHz ON OSC ≤ 3080 ns for f = 300 kHz OSC Time t OFF SYNC ...
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... DPA422-426 In order to be recognized as a synchronization pulse, the LINE-SENSE pin needs to stay low (on-time) for at least 120 ns but no more than 2250 ns for 400 kHz (or 3080 ns for 300 kHz) internal switching frequency. In addition, the off-time must be kept below 7.7 μs, which is a limitation set by the lowest synchronization frequency of 128 kHz allowed by the chip ...
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... ON/OFF, the vertical axis represents the enable/ disable states of the output. For external current limit, the vertical axis represents the magnitude of the I graphs in the Typical Performance Characteristics section for the current limit programming range and the selection of the appropriate resistor value. DPA422-426 UV (+135 OV reduction lowers MAX (+55 μ ...
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... DPA422-426 (Enabled) Output MOSFET Switching (Disabled) I (Default) LIMIT Current Limit -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 refer to the parametric table and typical performance characteristics sections of the data sheet for measured data. ...
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... For Values Shown 33 Input Voltage PI-2852-121504 Figure 14. Line-Sensing for Overvoltage Only (Under-Voltage Disabled). Maximum Duty Cycle will be reduced at Low Line. DPA422-426 D CONTROL 619 kΩ ...
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... DPA422-426 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 switch Input CONTROL Voltage KΩ - Figure 17. Active-on (Fail Safe) Remote ON/OFF. ...
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... Input Voltage C For kΩ 64% LIMIT See Figure 34 for other resistor values ( select different I LIMIT values PI-2837-011904 Figure 24. Synchronization. DPA422-426 Q can be an optocoupler + R output or can be replaced 619 kΩ MOSFET or manual 1% switch. Q For R R ON/OFF 47 kΩ ...
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... DPA422-426 Application Examples μ 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 25. A High Effi ciency Telecom Input DC-DC Converter. High Effi ciency 30 W Forward Converter ...
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... The basic circuitry to support IEEE standard 802.3af Power over Ethernet (PoE) is straightforward. Class 0 signature and classifi cation circuits can be implemented with a single resistor (30 V rather RRM and the required under-voltage lockout function is a voltage DPA422-426 L1 1 μ 330 μF 1 μ ...
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... DPA422-426 Ethernet (RJ-45) D101 Connector DL4002 PoE Interface (1,2) VR51 DL4002 28 V D102 R52 20 kΩ D103 DL4002 (4,5) R51 24.9 kΩ DL4002 1% 1/4 W D104 D105 DL4002 (3,6) C51 1 nF D51 50 V DL4002 BAV19 D106 D52 BAV19 D107 R53 DL4002 R54 20 kΩ 20 Ω (7,8) Q51 TIP29C (100 V/1 A) ...
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... Flyback Output Power Table for 24-48 VDC Input Voltage. Notes: 1. Maximum output power is limited by device internal current limit. 2. See text in this section for a complete description of assumptions. 3. See Part Ordering Information. 4. Higher switching losses may prevent DPA425 from delivering more power than a smaller device. DPA422-426 2 Max 2 Power ...
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... DPA422-426 give little or no improvement in effi ciency due to the improvement in conduction losses being negated by larger device switching losses. Figure 50 provides information on switching losses. This together with conduction loss calculations give an estimate of device dissipation. Primary Clamp A primary clamp network is recommended to keep the peak ...
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... R does not monitoring device temperatures, note that the junction-to- DS case thermal resistance should be accounted for when estimating die temperature. to allow DSS Design Tools Up-to-date information on design tools is available at the Power Integrations website: www.powerint.com. DPA422-426 variation. When DS(ON) 19 Rev. S 12/07 ...
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... DPA422-426 Solder Side Component Side TOP VIEW DPA-Switch In - Maximize hatched copper area for optimum heat sinking Via between board layers V Figure 28. Layout Considerations for DPA-Switch Using R Package. Top Side PCB Bottom Side PCB TOP VIEW (Two sided printed circuit board) ...
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... Absolute Maximum Ratings DRAIN Voltage .....................................................-0 220 V DRAIN Peak Current: DPA422......................................1.31 A DPA423......................................1.75 A DPA424....................................... 3.5 A DPA425...........................................7 A DPA426....................................... 9.6 A CONTROL Voltage ................................................ -0 CONTROL Current .........................................................100 mA LINE SENSE Pin Voltage ...................................... -0 EXTERNAL CURRENT LIMIT Pin Voltage ........ -0 FREQUENCY Pin Voltage ....................................... -0 ...
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... DPA422-426 Parameter Symbol Control Functions (cont.) Softstart Time t SOFT PWM Gain DC reg PWM Gain Temperature Drift Dynamic Impedance Z C Dynamic Impedance Temperature Drift CONTROL Pin Internal Filter Pole Shutdown/Auto-Restart CONTROL Pin I Charging Current C(CH)) Charging Current Temperature Drift Auto-Restart Upper V Threshold Voltage ...
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... 400 kHz OSC f = 300 kHz OSC From Synchronous On to Drain Turn- DPA422 di/dt = 225 mA/μs DPA423 di/dt = 300 mA/μ °C DPA424 di/dt = 600 mA/μs J DPA425 di/dt = 1.25 A/μs DPA426 di/dt = 1.75 A/μs DPA422-426 Min Typ Max Units 175 240 380 μA ...
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... 600 100 ° °C DPA425 1. 100 ° °C DPA426 1. 100 ° DPA422 Floating; DPA423 150 V; D DPA424 T = 125 °C; J DPA425 )/2 C C(skip) B DPA426 Floating °C; ...
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... DPA425 f = 400 kHz OSC DPA426 Output MOSFET Disabled OSC = 400 kHz L specifi cation by ramping the DRAIN pin voltage up to but not DSS ) vs. DRAIN voltage for low voltage operation characteristics. C DPA422-426 Min Typ Max Units 16 V 5.6 5.85 6.0 V ±50 PPM/°C 1.6 2.0 2 ...
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... DPA422-426 VOLTAGE Figure 30. Duty Cycle Measurement. 120 100 Dynamic 1 = Impedance Slope CONTROL Pin Voltage (V) Figure 31. CONTROL Pin I-V Characteristic 470 Ω 0-15 V NOTE: This test circuit is not applicable for current limit or output characteristic measurements. Figure 33. DPA-Switch General Test Circuit. ...
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... Temporarily shorting the CONTROL pin to the SOURCE pin will reset DPA-Switch, which then will come up in the correct state. -180 -130 -80 I (μA) X Maximum Typical External Current Limit Resistor R DPA422-426 - (kΩ) IL Rev. S 12/ ...
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... DPA422-426 Typical Performance Characteristics (cont.) 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - Junction Temperature (°C) Figure 36. Frequency vs. Temperature. 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - Junction Temperature (°C) Figure 38. External Current Limit vs. Temperature with kΩ. IL 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - Junction Temperature (°C) Figure 40. Under-Voltage Threshold vs. Temperature. 28 Rev. S 12/07 75 100 125 150 Figure 37 ...
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... Junction Temperature (°C) Figure 46. Remote OFF DRAIN Supply Current vs. Temperature. www.powerint.com -75 -25 -50 0 Figure 43. CONTROL Pin Current at Minimum Duty 75 100 125 150 Figure 45 100 125 150 Figure 47. Breakdown Voltage vs. Temperature. DPA422-426 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - 100 125 150 Junction Temperature (°C) Cycle vs ...
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... DPA422-426 Typical Performance Characteristics (cont Scaling Factors: T DPA423 = 0.18 CASE 16 DPA424 = 0.36 DPA425 = 0.72 DPA426 = 1. Drain Voltage (V) Figure 48. Output Characteristics. 10000 1000 100 100 120 140 160 DRAIN Voltage (V) Figure 50. C vs. DRAIN Voltage. OSS ...
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... D S .004 (.10 - SMD-8 .046 .060 .060 .046 Pin 1 .086 .186 -D- .286 Solder Pad Dimensions -F- .004 (.10 DPA422-426 - - 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 0.004-0.012 0.10-0.30 .420 H 0.036-0.044 0.91-1.12 J1 ...
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... DPA422-426 .390 (9.91) .420 (10.67) .055 (1.40) .066 (1.68) .326 (8.28) .336 (8.53) .208 (5.28) Ref .024 (0.61) .034 (0.86) .315 (8.00) .380 (9.65) .638 (16.21) .050 (1.27) .038 (0.97) 32 Rev. S 12/07 TO-263-7C .245 (6.22) MIN .225 (5.72) MIN .580 (14.73) .620 (15.75) 0.68 (1.73) MIN .100 (2.54) .050 (1.27) REF .165 (4.19) Solder Pad .185 (4.70) Dimensions Notes: 1. Package Outline Exclusive of Mold Flash & Metal Burr. ...
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... Notes DPA422-426 33 Rev. S 12/07 ...
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... DPA422-426 34 Rev. S 12/07 Notes www.powerint.com ...
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... Corrected Figure 3. M Added package information to Table 1. Revised Figure 13. Added lead-free ordering information. N Minor error corrections. O Added S-PAK. P Added notes to Table 6. Q Updated Figure 27 to best refl ect current requirements for PoE. R Added DPA422. S Removed S-Pack. www.powerint.com ), and MIN F F DSS ...
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... The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, EcoSmart, Clampless, E-Shield, Filterfuse, StakFET, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. ©2007, Power Integrations, Inc. ...