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DNK05S0A0R30NFA Datasheet(PDF) 11 Page - Delta Electronics, Inc. |
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DNK05S0A0R30NFA Datasheet(HTML) 11 Page - Delta Electronics, Inc. |
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11 / 15 page  DS_DNK05SIP_06042012 11 FEATURES DESCRIPTIONS (CON.) Table 1 provides Rtrim values required for some common output voltages. By using a 0.5% tolerance trim resistor, set point tolerance of ±1.5% can be achieved as specified in the electrical specification. Table 1 VO (V) Rtrim (Ω) 0.8 Open 1.2 2900 1.5 1614 1.8 1100 2.5 606 3.3 380 5.0 185.7 Voltage Margining Output voltage margining can be implemented in the DNK modules by connecting a resistor, R margin-up, from the Trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargin-down, from the Trim pin to the output pin for margining-down. Figure 39 shows the circuit configuration for output voltage margining. If unused, leave the trim pin unconnected. A calculation tool is available from the evaluation procedure which computes the values of R margin-up and Rmargin-down for a specific output voltage and margin percentage. Vo On/Off Vin GND Trim Q2 Q1 Rmargin-up Rmargin-down Rtrim Figure 39: Circuit configuration for output voltage margining FEATURES DESCRIPTIONS (CON.) Voltage Tracking The DNK family was designed for applications that have output voltage tracking requirements during power-up and power-down. The devices have a TRACK pin to implement three types of tracking method: sequential, simultaneous and ratio-metric. TRACK simplifies the task of supply voltage tracking in a power system by enabling modules to track each other, or any external voltage, during power-up and power-down. By connecting multiple modules together, customers can get multiple modules to track their output voltages to the voltage applied on the TRACK pin. The DNK family has option code A for TRACK function. The output voltage Track characteristic can be achieved when the output voltage of PS2 follows the output voltage of PS1 on a volt-to-volt basis. Figure 40: Simultaneous tracking Simultaneous tracking (Figure 40) is implemented by using a voltage divider around the TRACK pin. The objective is to minimize the voltage difference between the power supply outputs during power up and down. For type A (DNX0A0XXXX A), the simultaneous tracking can be accomplished by connecting VoPS1 to the TRACK pin of PS2 where the voltage divider is inside the PS2. |
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