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LM4041 Folha de dados(PDF) 5 Page - Diodes Incorporated |
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LM4041 Folha de dados(HTML) 5 Page - Diodes Incorporated |
5 / 7 page LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES LM4041 Document number: DS32020 Rev. 7 - 2 5 of 7 www.diodes.com December 2010 © Diodes Incorporated Application Information In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the LM4041. RS determines the current that flows through the load (IL) and the LM4041 (IR). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IR to the LM4040 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4040 is less than 12 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the LM4040’s reverse breakdown voltage, VR. R L R S S I I V V R + − = The LM4041 comes in two varients: • LM4041 with fixed 1.225V output • LM4041_ADJ with variable output voltage. The LM4041-ADJ’s output voltage can be adjusted to any value in the range of 1.24V through 10V. The output voltage is set by the ratio of two external feedback resistors as shown in Figure 2 and the internal reference voltage (VR). The output voltage is found using the equation: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + × = 1 2 R O R R 1 V V Printed circuit board layout considerations LM4041 with fixed output voltage in the SOT23 package has the die attached to pin 1, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 1 of the SOT23 package must be left floating or connected to pin 2. LM4041 with fixed output voltage in the SC70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 2 must be left floating or connected to pin1. RS VS IR + IL IR IL VR Figure 1 RS VS IR + IL IR IL VR VO Figure 2 |
Nº de peça semelhante - LM4041 |
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Descrição semelhante - LM4041 |
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