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DNM04S0A0S06PFD Datasheet(PDF) 10 Page - Delta Electronics, Inc. |
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DNM04S0A0S06PFD Datasheet(HTML) 10 Page - Delta Electronics, Inc. |
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10 / 17 page  DS_DNS04SMD6A_10202006 10 Vo(V) Vtrim(V) 0.7525 Open 1.2 0.624 1.5 0.573 1.8 0.522 2.5 0.403 3.3 0.267 Vo(V) Rtrim(KΩ) 0.7525 Open 1.2 41.97 1.5 23.08 1.8 15.00 2.5 6.95 3.3 3.16 Table 2 Vo TRIM GND RLoad Vtrim + _ Figure 38: Circuit Configuration for programming output voltage using external voltage source Table 1 provides Rtrim values required for some common output voltages, while Table 2 provides value of external voltage source, Vtrim, for the same common output voltages. By using a 1% tolerance trim resistor, set point tolerance of ±2% can be achieved as specified in the electrical specification. Table 1 Vo TRIM GND RLoad Rtrim Figure 37: Circuit configuration for programming output voltage using an external resistor ( ) 7525 . 0 1698 . 0 7 . 0 − × − = Vo Vtrim For example, to program the output voltage of a DNS module to 3.3 Vdc, Vtrim is calculated as follows ( ) V Vtrim 267 . 0 7525 . 0 3 . 3 1698 . 0 7 . 0 = − × − = FEATURES DESCRIPTIONS (CON.) Over-Temperature Protection The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold the module will shut down. The module will try to restart after shutdown. If the over-temperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification. Remote Sense The DNS provide Vo remote sensing to achieve proper regulation at the load points and reduce effects of distribution losses on output line. In the event of an open remote sense line, the module shall maintain local sense regulation through an internal resistor. The module shall correct for a total of 0.5V of loss. The remote sense line impedance shall be < 10 Ω. Vo Sense Vin GND RL Distribution Losses Distribution Losses Distribution L Distribution Figure 36: Effective circuit configuration for remote sense operation Output Voltage Programming The output voltage of the DNS can be programmed to any voltage between 0.75Vdc and 3.3Vdc by connecting one resistor (shown as Rtrim in Figure 37) between the TRIM and GND pins of the module. Without this external resistor, the output voltage of the module is 0.7525 Vdc. To calculate the value of the resistor Rtrim for a particular output voltage Vo, please use the following equation: Ω ⎥⎦ ⎤ ⎢⎣ ⎡ − − = 5110 7525 . 0 21070 Vo Rtrim For example, to program the output voltage of the DNS module to 1.8Vdc, Rtrim is calculated as follows: Ω = Ω ⎥⎦ ⎤ ⎢⎣ ⎡ − − = K Rtrim 15 5110 7525 . 0 8 . 1 21070 DNS can also be programmed by apply a voltage between the TRIM and GND pins (Figure 38). The following equation can be used to determine the value of Vtrim needed for a desired output voltage Vo: |
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