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MIC4607-2YML-T5 Datasheet(PDF) 20 Page - Microchip Technology |
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MIC4607-2YML-T5 Datasheet(HTML) 20 Page - Microchip Technology |
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20 / 42 page  MIC4607 DS20005610A-page 20 2016 Microchip Technology Inc. 5.0 FUNCTIONAL DESCRIPTION The MIC4607 is a non-inverting, 85V three-phase MOSFET driver designed to independently drive all six N-Channel MOSFETs in a three-phase bridge. The MIC4607 offers a wide 5.5V to 16V VDD operating supply range with either six independent TTL inputs (MIC4607-1) or three PWM inputs, one for each phase (MIC4607-2). Refer to the Functional Diagram section. The drivers contain input buffers with hysteresis, four independent UVLO circuits (three high-side and one low-side), and six output drivers. The high-side output drivers utilize a high-speed level-shifting circuit that is referenced to its HS pin. Each phase has an internal diode that is used by the bootstrap circuits to provide the drive voltages for each of the three high-side outputs. A programmable overcurrent protection circuit turns off all outputs during an overcurrent fault. 5.1 Startup and UVLO The UVLO circuits force the driver’s outputs low until the supply voltage exceeds the UVLO threshold. The low-side UVLO circuit monitors the voltage between the VDD and VSS pins. The high-side UVLO circuits monitor the voltage between the xHB and xHS pins. Hysteresis in the UVLO circuits prevent system noise and finite circuit impedance from causing chatter during turn-on. 5.2 Enable Inputs There is one external enable pin that controls all three phases. A logic high on the enable pin (EN) allows for startup of all phases and normal operation. Conversely, when a logic low is applied on the enable pin, all phases turn-off and the device enters a low current shutdown mode. All outputs (xHO and xLO) are pulled low when EN is low. Do not leave the EN pin floating. 5.3 Input Stage All input pins (xLI and xHI) are referenced to the VSS pin. The MIC4607 has a TTL-compatible input range and can be used with input signals with amplitude less than the supply voltage. The threshold level is indepen- dent of the VDD supply voltage and there is no depen- dence between IVDD and the input signal amplitude. This feature makes the MIC4607 an excellent level translator that will drive high level gate threshold MOS- FETs from a low-voltage PWM IC. 5.4 Low-Side Driver The low-side driver is designed to drive a ground (VSS pin) referenced N-channel MOSFET. Low driver impedances allow the external MOSFET to be turned on and off quickly. The rail-to-rail drive capability of the output ensures a low RDSON from the external power device. Refer to Figure 5-1. A high level applied to the xLI pin causes VDD to be applied to the gate of the external MOSFET. A low level on the xLI pin grounds the gate of the external MOSFET. FIGURE 5-1: Low-Side Driver Block Diagram. 5.5 High-Side Driver and Bootstrap Circuit Figure 5-2 illustrates a block diagram of the high-side driver and bootstrap circuit. This driver is designed to drive a floating N-channel MOSFET, whose source ter- minal is referenced to the HS pin. FIGURE 5-2: High-Side Driver and Bootstrap-Circuit Block Diagram. A low-power, high-speed, level-shifting circuit isolates the low side (VSS pin) referenced circuitry from the high-side (xHS pin) referenced driver. Power to the high-side driver and UVLO circuit is supplied by the bootstrap capacitor (CB) while the voltage level of the xHS pin is shifted high. The bootstrap circuit consists of an internal diode and external capacitor, CB. In a typical application, such as the motor driver shown in Figure 5-3 (only Phase A illustrated), the AHS pin is at ground potential while the low-side MOSFET is on. The internal diode charges capacitor CB to VDD-VF during this time (where VF is VSS VDD LO EXTERNAL FET MIC4607 SWITCH NODE HS HB HO EXTERNAL FET VDD CB MIC4607 LEVEL SHIFT VIN RHS SWITCH NODE |
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Similar Description - MIC4607-2YML-T5 |
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