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CHL8510 Datasheet(PDF) 9 Page - International Rectifier |
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CHL8510 Datasheet(HTML) 9 Page - International Rectifier |
9 / 15 page September 17, 2012 | FINAL | V1.11 9 IR3537 CHL8510 12V High Performance Gate Driver GENERAL DESCRIPTION The IR3537/CHL8510 is a high efficiency, fast MOSFET driver with large source and sink current capability. It can reliably drive the external high- and low-side N-channel MOSFETs with large input capacitance at switching frequencies up to 1MHz. The proprietary IR Active Tri-Level (ATL) feature allows complete control over enable and disable of both MOSFETs using the PWM input signal from the controller. The driver is also compatible with a generic tri-state PWM signal. The Active Tri-Level or tri-state is selectable by the MODE pin. During normal operation the PWM transitions between low and high voltage levels to drive the low- and high-side MOSFETs. The PWM signal falling edge transition to a low voltage threshold initiates the high-side driver turn off after a short propagation delay, tPDL(HS). The dead time control circuit monitors the HI_GATE and switch voltages to ensure the high-side MOSFET is turned off before the LO_GATE voltage is allowed to rise to turn on the low-side MOSFET. The PWM rising edge transition through the high-side turn- on threshold initiates the turn off of the low-side MOSFET after a small propagation delay, tPDL(LS). The adaptive dead time circuit provides the appropriate dead time by determining if the falling LO_GATE voltage threshold has been crossed before allowing the HI_GATE voltage to rise and turn on the high-side MOSFET, tPDH(HS). THEORY OF OPERATION POWER-ON RESET (POR) The IR3537/CHL8510 incorporates a power-on reset feature. This ensures that both the high- and low-side output drivers are made active only after the device supply voltage has exceeded a certain minimum operating threshold. The Vcc supply is monitored and both the drivers are set to the low state, holding both external MOSFETs off. Once Vcc crosses the rising POR threshold, the IR3537/CHL8510 is reset and the outputs are held in the low state until a transition from tri-state to active operation is detected at the PWM input. During normal operation the drivers continue to remain active until the Vcc falls below the falling POR threshold. These POR voltage threshold levels allow seamless functionality with International Rectifier’s digital controllers, such that the drivers are always active before the controller starts to provide the PWM signal and are inactive only after the controller shuts down. INTEGRATED BOOTSTRAP DIODE The IR3537/CHL8510 features an integrated bootstrap diode to reduce external component count. This enables the IR3537/CHL8510 to be used effectively in cost and space sensitive designs. The bootstrap circuit is used to establish the gate voltage for the high-side driver. It consists of a diode and capacitor connected between the SWITCH and BOOT pins of the device. Integrating the diode within the IR3537/CHL8510, results in the need for an external boot capacitor only. The bootstrap capacitor is charged through the diode and injects this charge into the high-side MOSFET input capacitance when PWM signal goes high. PWM MODE SELECTION The IR3537/CHL8510 features a MODE pin which allows operation with different PWM signal levels. The IR3537/CHL8510 is capable of driving external MOSFETs based on one of two different tri-level PWM input signals from a controller. Floating the MODE pin enables the IR3537/CHL8510 to switch external FETs based on the IR Active Tri-Level mode. In ATL mode, the PWM voltage level is from 0V to 1.8V for low to high transitions. A PWM voltage level greater than the tri-state HI_GATE threshold disables switching of both MOSFETs. Grounding the MODE pin enables the |
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