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TC54VX29 Datasheet(PDF) 6 Page - Microchip Technology |
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TC54VX29 Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 16 page  TC54 DS21434G-page 6 2004 Microchip Technology Inc. 4.0 APPLICATIONS INFORMATION 4.1 Modifying The Trip Point, VDET – Although the TC54 has a pre-programmed VDET –, it is sometimes necessary to make adjustments during pro- totyping. This can be accomplished by connecting an external resistor divider to a TC54, which has a VDET – lower than that of VSOURCE (Figure 4-1). To maintain detector accuracy, the bleeder current through the divider should be significantly higher than the 1 µA operating current required by the TC54. A reasonable value for this bleeder current is 100 µA (100 times the 1 µA required by the TC54). For example, if VDET – = 2V and the desired trip point is 2.5V, the value of R1 + R2 is 25 kΩ (2.5V/100 µA). The value of R1 + R2 can be rounded to the nearest standard value and plugged into the equation of Figure 4-1 to calculate values for R1 and R2. 1% tolerance resistors are recommended. FIGURE 4-1: Modify trip-point of the TC54 using external resistor divider. 4.2 Other Applications Low operating power and small physical size make the TC54 series ideal for many voltage detector applica- tions, such as those shown in Figures 4-2, 4-3 and 4-4. Figure 4-2 shows a low-voltage gate drive protection circuit that prevents overheating of the logic-level MOSFET due to insufficient gate voltage. When the input signal is below the threshold of the TC54VN, its output grounds the gate of the MOSFET. Figure 4-3 and Figure 4-4 show the TC54 in conventional voltage monitoring applications. FIGURE 4-2: MOSFET Low Drive Protection. FIGURE 4-3: Battery Voltage Monitor. FIGURE 4-4: Power Good Monitor. Where: VSOURCE = Voltage to be monitored (VDET –) = Threshold Voltage setting of TC54 Note: In this example, VSOURCE must be greater than (VDET –) V SOURCE R 1 R 1 R 2 + -------------------- V DET - == TC54 VIN VOUT VSS R1 VSOURCE R2 VIN VOUT VSS TC54VX 270 Ω MTP3055EL VCC RL 4.3V VIN VOUT VSS BATLOW TC54VX + – – VIN VOUT VSS Power Good TC54VX + – Pwr Sply |
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