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FSB50550A データシート(PDF) 11 Page - Fairchild Semiconductor |
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FSB50550A データシート(HTML) 11 Page - Fairchild Semiconductor |
11 / 28 page AN-9080 APPLICATION NOTE © 2013 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.1 • 4/16/14 11 4. Integrated Functions and Protection Circuit 4.1. Internal Structure of HVIC Common Mode Noise Canceller Level-Shift Circuit HIN 500k (typ) HVIC of Motion SPM ® 5 Series Version 2 Products 500k (typ) LIN Input Noise Filter Input Noise Filter 90ns(typ) Gate Driver w/ Gate Resistors Gate Driver w/ Gate Resistors Matching Delay HO LO Figure 13. Internal Block Diagram of HVIC Figure 13 shows the block diagram of the internal structure of the HVIC inside Motion SPM 5 Series V2 products. Gate signal input pins have internal 500 kΩ (typical) pull-down resistors. The weak pull-down reduces standby power consumption. If there is any concern for malfunction due to noise associated with layout, additional pull-down resistors of 4.7 kΩ, for example, are recommended close to the module input pins. RC filters can be used instead of pull- downs to reduce noise and narrow pulses as well. Keep in mind that this filter introduces some distortion of PWM volt-second because the ON/OFF threshold levels are not symmetrical within the supplied voltage. 4.2. Circuit of Input Signal (VIN(H), VIN(L)) Figure 14 shows an example of PWM input interface circuit from the microcontroller (MCU) to Motion SPM 5 Series products. The input logic is active HIGH and, because there are built-in pull-down resistors of 500 kΩ, external pull- down resistors are not typically needed. MCU SPM IN(UH), IN(VH), IN(WH) IN(UL), IN(VL), IN(WL) COM RF CF RPD Figure 14. Recommended MCU I/O Interface Circuit The maximum rating voltages of the input pins are shown in Table 4. The RC coupling at each input shown dotted in Figure 14 may change depending on the PWM control scheme used in the application and the wiring impedance of the application PCB layout. Table 4. Maximum Ratings of Input Pins Item Symbol Condition Rating (V) Control Supply Voltage VCC Applied between VCC – COM 20 Input Signal Voltage VIN Applied between IN(xH) – COM, IN(xL) – COM -0.3 ~ VCC + 0.3 Motion SPM 5 Series products employ active-HIGH input logic. This removes the sequence restriction between the control supply and the input signal during power supply startup or shutdown. In addition, pull-down resistors are built into each input circuit. Therefore, external pull-down resistors are not typically needed and the number of external components is smaller as a result. The input noise filter inside the HVIC suppresses short pulse noise and prevents the MOSFET from malfunction and excessive switching loss. Furthermore, by lowering the turn-on and turn-off threshold voltages of the input signal, as shown in Table 5, a direct connection to 3.3 V-class MCU or DSP is possible. Table 5. Input Threshold Voltage Ratings (at VCC=15 V, TJ=25 °C) Item Symbol Condition Min. Max. On Threshold Voltage VIH IN(UH), IN(VH), IN(WH) – COM IN(UL), IN(VL), IN(WL) - COM 2.9 V Off Threshold Voltage VIL 0.8 V As shown in Figure 13, the input signal integrates a 500 kΩ (typical) pull-down resistor. Therefore, when using an external filtering resistor between the MCU output and the Motion SPM ® input, attention should be paid to the signal voltage drop at the input terminals to satisfy the turn-on threshold voltage requirement. For instance, R=100 Ω and C=1 nF can be used for the parts shown dotted in Figure 14. 4.3. Functions vs. Control Supply Voltage Control and gate drive power for SPM 5 Series V2 products is normally provided by a single 15 V DC supply connected to the module VCC and COM terminals. For proper operation, this voltage should be regulated to 15 V 10% and its current supply should be larger than 260 µA for SPM product, excluding other circuitry. Table 6 describes the behavior of the SPM parts for various control supply voltages. The control supply should be well filtered with a low impedance electrolytic capacitor and a high-frequency decoupling capacitor connected right at the pins. High-frequency noise on the supply might cause the internal control IC to malfunction and generate erroneous signals. To avoid these problems, the maximum ripple on the supply should be less than ±1 V/µs. In addition, it may be necessary to connect a 20 V/1 W Zener diode (for example, 1N4747A) across the control supply to prevent surge destruction under severe conditions. It is very important that all control circuits and power supplies should be referred to COM terminal of the module and not to the N power terminal. In general, it is best practice to make the common reference (COM) a ground plane in the PCB layout. The main control power supply is also connected to the bootstrap circuits that are used to establish the floating supplies for the high-side gate drives. When control supply voltage (VCC and VBS) falls below Under-Voltage Lockout (UVLO) level, HVIC turns off the MOSFETs while disregarding gate control input signals. |
同様の部品番号 - FSB50550A |
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同様の説明 - FSB50550A |
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