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TCN4040E-2.5ENB Datasheet(PDF) 8 Page - TelCom Semiconductor, Inc |
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TCN4040E-2.5ENB Datasheet(HTML) 8 Page - TelCom Semiconductor, Inc |
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8 / 9 page  TCN4041 4 PRELIMINARY INFORMATION TCN4041-01 6/19/97 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE Output voltage on the TCN4041-ADJ can be adjusted to any value between 1.24V and 10V. It is a function of the internal reference voltage (VREF) and the ratio of the external feedback resistors (see Figure 2). The output can be found with the equation (where VOUT is the desired output voltage): VOUT = VREF (R2/R1 + 1) Equation 1. The value of the internal VREF is a function of VO. The “corrected” VREF can be determined by (where VO is the desired output voltage): VREF’ = VOUT ∆VREF/∆VOUT) +VY Equation 2. ∆VREF/∆VOUT is typically -1.3mV/V, and VY = 1.240V. Replace the value of VREF’ in Equation 1 with the value determined using Equation 2. The actual output voltage can deviate from that pre- dicted by the typical ∆VREF/∆VO in Equation 2. The worst case ∆VREF/∆VOUT for C-grade parts is – 2.5mV/V and VY = 1.246V; for D-grade, the worst case is – 3.0mV/V and VY = 1.248V. The difference in output voltage resulting from typical worst case values are shown in the following example: Let VO = +9V. Using the typical value of ∆VREF/∆VOUT, VREF is 1.228; choosing a value of R1 = 10k Ω, R2 = 63.272kW. The output voltage, when using worst case ∆VREF/∆VOUT for C-grade and D-grade parts, is 8.965V and 8.946V, respec- tively. This could result in errors as large as 0.39% for C-grade, and 0.59% for D-grade parts. However, resistor values resulting from the typical value of ∆VREF/∆VOUT will work most of the time, requiring no additional adjustments. APPLICATIONS INFORMATION Available in space-saving SOT-23B-3 surface mount packages, the TCN4041 is a precision micro-power curvature-corrected bandgap shunt voltage reference. It is designed for stable operation without an external capacitor connected between the “+” pin and the “-” pin. The TCN4041 also remains stable, however, if a bypass capacitor is used. The device is available in either a fixed 1.2V or an adjustable reverse breakdown voltage. The minimum operating cur- rent is 60mA, and the maximum operating current is 12mA for both options. TCN4041s in the SOT-23 package have pin 1 connected as the (-) output. (Die attach interface contact). Therefore, pin 1 of the TCN4041-1.2 must be left floating or connected to pin 3, and pin 1 on the TCN4041-ADJ is the (-) output. In a conventional shunt regulator application, an external series resistor (RS) is connected between the supply voltage and the TCN4041 (Figure 1). RS determines the current that flows through the load (IL) and the TCN4041 (IQ). Even when the supply voltage is at its minimum, and the load current is at its maximum value, RS should be small enough to supply at least the minimum acceptable IQ to the TCN4041 since load current and supply voltage may vary. Conversely, when the supply voltage is at its maximum and IL is at its minimum, RS should be large enough that the current flowing through the TCN4041 is less than 12mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the TCN4041’s reverse breakdown voltage, VR. VS - VR RS = IL + IQ PIN DESCRIPTION Pin No. Pin No. Pin No. (SOT-23B-3) TO-92 8-Pin SOIC Symbol Description 1 1 1 NC No connection 2 NC No connection 3 NC No connection 2 2 + Positive terminal 3 3 – Negative terminal 4 – Negative terminal 5 NC No connection 6 NC No connection 7 NC No connection 8 + Positive terminal |
Similar Part No. - TCN4040E-2.5ENB |
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Similar Description - TCN4040E-2.5ENB |
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