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TC54VN2902ECB713 Arkusz danych(PDF) 6 Page - Microchip Technology |
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TC54VN2902ECB713 Arkusz danych(HTML) 6 Page - Microchip Technology |
6 / 16 page TC54 DS21434H-page 6 © 2007 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 prototyping. 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 applications, 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. 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 Where: VSOURCE = Voltage to be monitored VDET – = Threshold Voltage setting of TC54 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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