DPA423 Power Integrations, Inc., DPA423 Datasheet
DPA423
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DPA423 Summary of contents
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... DPA424 DPA425 DPA426 Total Device Dissipation PRODUCT DPA423 DPA424 DPA425 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 below, use packages. ...
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... 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 Cycle and Cycle Skipping ............................................................................................................... 6 Error Amplifier ......................................................................................................................................................... 6 On-chip Current Limit with External Programmability ............................................................................................. 6 Line Under-Voltage Detection (UV) ........................................................................................................................ 6 Line Overvoltage Shutdown (OV) ...
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... SOURCE pin and 300 kHz if connected to CONTROL pin. SOURCE (S) Pin: Output MOSFET source connection for the power return. Primary side control circuit common and reference point. P Package (DIP-8) G Package (SMD- MAX Figure 3. Pin Configuration (top view). DPA423-426 0 INTERNAL SUPPLY CURRENT LIMIT COMPARATOR CONTROLLED TURN-ON GATE DRIVER S ...
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... 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 the duty cycle of the power MOSFET decreases linearly with increasing CONTROL pin current as shown in Figure 4 ...
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... CONTROL pin, lowers the switching frequency to 300 kHz, which may be preferable in some applications such as those employing secondary synchronous rectification. Otherwise, the FREQUENCY pin should be connected to the SOURCE pin for the default 400 kHz DPA423-426 4 within a C 5.8 V PI-2545-050602 ...
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... 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 internal supply current of the chip (see Figure 4). ...
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... If the DPA-Switch is held in remote-off state for longer than 10 µs f ≥ 128 kHz; t ≤ 7.7 µs; 120 ns ≤ t SYNC OFF OFF DPA423-426 ≤ 2250 ns for f = 400 kHz ON OSC ≤ 3080 ns for f = 300 kHz OSC Time t OFF ...
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... 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 runs entirely off the high voltage DC input, but with very low power consumption (30 mW typical with LINE-SENSE and EXTERNAL CURRENT LIMIT pins open) ...
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... SOURCE pin through a resistor. The pin can also be used as a remote on/off control input. Table DPA423-426 (+50 µA typical UV (+135 µA typical OV reduction, MAX Line feed MAX ...
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... 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 refer to the parametric table and typical performance characteristics sections of the data sheet for measured data. ...
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... 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 (Positive Current Sense - Under-Voltage, Overvoltage, ON/OFF Maximum Duty Cycle Reduction) 240 µA DPA423-426 PI-2765-080801 L 11 4/04 ...
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... 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 Figure 11. Three Terminal Operation (LINE-SENSE and EXTERNAL CURRENT LIMIT Features Disabled. FREQUENCY Pin can be tied to SOURCE or CONTROL Pin) ...
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... For kΩ 64% LIMIT Input For kΩ IL Voltage I = 34% LIMIT C ON/OFF kΩ PI-2856-072602 Figure 20. Active-off Remote ON/OFF with Externally Set Current DPA423-426 + I = 100 VDC LIMIT VDC LIMIT 363 kΩ CONTROL 4.2 kΩ ...
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... 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 LIMIT. + 619 KΩ Input CONTROL Voltage kΩ ...
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... Diode D4 resets the voltage on capacitor C17 before the next switching cycle. During the primary off-time, the diode D2 provides a conduction path for the energy in inductor L2 while Q1 is still off. The transformer DPA423-426 C10 C11 C12 100 µF 100 µ ...
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... The DPA-Switch flyback power supply provides a cost effective solution for high density PoE and VoIP DC-DC applications. Figure 26 shows a typical implementation of a single output flyback converter using the DPA423G. For applications that require input to output isolation, this simple, low component count design delivers 6 3.3 V from a 36 VDC to 57 VDC input with a nominal efficiency at 48 VDC of 80% ...
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... W. In the same converter, DPA425 would dissipate 0.5 W. Selecting DPA425 with associated reduced dissipation would increase overall converter efficiency by approximately 2%. Issues Affecting Dissipation: 1) Using synchronous rectification will tend to reduce device dissipation. DPA423-426 2 Max 2 Power 1 ...
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... OUTPUT POWER TABLE 24-48 VDC RANGE (FLYBACK) Total Device Dissipation 0 PRODUCT DPA423 8 DPA424 DPA425 Table 6. Flyback Output Power Table for 24 VDC Minimum 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 ...
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... R monitoring device temperatures, note that the junction-to- case thermal resistance should be accounted for when estimating die temperature. Design Tools Up-to-date information on design tools is available at the Power Integrations Web site: www.powerint.com. DPA423-426 does not DS DSS variation. When DS(ON) L ...
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... 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 Side PCB TOP VIEW (Two sided printed circuit board) ...
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... 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 Pin Voltage ................................ -0 EXTERNAL CURRENT LIMIT Pin Voltage .. -0 FREQUENCY Pin Voltage ............................... -0 Thermal Impedance Package: (θ ) ...................... 70 °C/W JA (3) ......................................... 11 °C/W (θ ...
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... 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 Temperature Drift Auto-restart Upper V Threshold Voltage C (AR)U Auto-restart Lower ...
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... Floating 400 kHz OSC f = 300 kHz OSC From Synchronous On to Drain Turn-On DPA423-426 Min Typ Max Units 135 149 µA 117 131 4 -27 -21.5 -16 µA -25.5 4.5 175 240 380 µA -230 -170 -270 ...
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... ON-State R Resistance DS(ON 4/04 Conditions (Unless Otherwise Specified) See Figure 32 ; SOURCE = -40 to 125 ° DPA423 di/dt = 300 mA/µs DPA424 di/dt = 600 mA/µ °C J DPA425 di/dt = 1.25 A/µs DPA426 di/dt = 1.75 A/µ ° )/2 C C(skip °C DPA423 ...
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... DPA423 Output MOSFET Enabled DPA424 DPA425 400 kHz DPA426 OSC Output MOSFET Disabled 400 kHz L OSC specification by ramping the DRAIN pin voltage up to DSS . DPA423-426 Min Typ Max Units 65 130 µA 260 360 220 5.6 5.85 6.0 V ± ...
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... 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: This test circuit is not applicable for current limit or output characteristic measurements. Figure 32. 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 DPA423-426 power supply be turned on first C - (kΩ 4/04 27 ...
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... 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 - 100 125 150 Junction Temperature (°C) Figure 37. External Current Limit vs. Temperature =12 k Ω . with R IL 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - 100 125 150 Junction Temperature (° ...
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... Figure 42. CONTROL Pin Current at Minimum Duty 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Figure 44. I 1.1 1.0 0.9 Figure 46 Breakdown Voltage vs. Temperature. DPA423-426 -50 - 100 125 150 Junction Temperature (°C) Cycle vs. Temperature DRAIN Voltage (V) vs. DRAIN Voltage. C -50 - 100 125 150 Junction Temperature (° ...
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... Figure 48. On-resistance vs. Temperature. 2.5 Data taken from a typical 2 forward converter design. 1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 In-Circuit Peak Drain Current Normalized to Nominal Device Internal Current Limit Figure 50. Typical Switching Loss 100 125 150 Temperature (°C) Scaling Factors: DPA423 = 0.08 DPA424 = 0.20 DPA425 = 0.55 DPA426 = 1.00 ...
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... 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 Package: 750 min.) DPA423-426 (423, 424 & 425 only 4/04 ...
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... 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 7.62-8.13 P 0.300-0.390 7.62-9.91 Q 0.300 BSC 7.62 BSC Notes: 1. Package dimensions conform to JEDEC specification MS-001-AB for standard dual in-line (DIP) package ...
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... Notes: 1. Package Outline Exclusive of Mold Flash & Metal Burr. 2. Package Outline Inclusive of Plating Thickness. .128 (3.25) 3. Foot Length Measured at Intercept Point Between Datum A Lead Surface. 4. Controlling Dimensions are in Inches. Millimeter Dimensions are shown in Parentheses. DPA423-426 .045 (1.14) .055 (1.40) .000 (0.00) .010 (0.25) .090 (2.29) .110 (2.79) -A- .010 (0.25) ...
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... DPA423-426 L 34 4/04 ...
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... Updated R package description. 3) Revised thermal impedances (θ 4) Updated Figure 25 and description in text Corrected text errors on pp and 20 Figure 25 and description in text updated Added P and G packages Corrected Figure and MIN F F DSS DPA423-426 Date 6/02 9/02 4/03 5/03 5/03 1/04 4/ 4/04 ...
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... DPA423-426 For the latest updates, visit our Web site: www.powerint.com Power Integrations may make changes to its products at any time. Power Integrations has no liability arising from your use of any information, device or circuit described herein nor does it convey any license under its patent rights or the rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS ...