IRS2573D Ver la hoja de datos (PDF) - International Rectifier
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IRS2573D Datasheet PDF : 28 Pages
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IRS2573D
Application Information and Additional Details
Information regarding the following topics is included as subsections within this section of the datasheet.
• IGBT/MOSFET Gate Drive
• Undervoltage Lockout Protection
• General Mode
• Ignition Timer
• Full-Bridge Control
• Buck Control
• Constant Power Control
• Current Limitation Control
• Over Voltage Fault Counter
• Under Voltage Fault Counter
• Fast Transient Under-Voltage Fault Counter
• Good Counter
• Fault Reset
• PCB Layout Tips
• Additional Documentation
IGBT/MOSFET Gate Drive
The IRS2573D HVICs are designed to drive up to six MOSFET or IGBT power devices. Figures 1 and 2 illustrate
several parameters associated with the gate drive functionality of the HVIC. The output current of the HVIC, used
to drive the gate of the power switch, is defined as IO. The voltage that drives the gate of the external power
switch is defined as VHO for the high-side power switch and VLO for the low-side power switch; this parameter is
sometimes generically called VOUT and in this case does not differentiate between the high-side or low-side output
voltage.
VB
(or VCC)
HO
(or LO)
VS
(or COM)
IO+
+
VHO (or VLO)
-
VB
(or VCC)
HO
(or LO)
IO-
VS
(or COM)
Figure 1: HVIC sourcing current
Figure 2: HVIC sinking current
Undervoltage Lock-Out
The under-voltage lockout mode (UVLO) is defined as the state the IC is in when VCC is below the turn-on
threshold of the IC. The IC is designed to maintain an ultra-low supply current during UVLO mode of 150uA for
reducing power losses across the external start-up resistor, and, to guarantee the IC is fully functional before the
buck high-side and full-bridge high and low-side output drivers are activated. The external capacitor from VCC
to COM is charged by a current flowing from the rectified AC line or DC bus through an external supply resistor
minus the micro-power start-up current drawn by the IC. The external start-up resistor is chosen so that VCC
exceeds the IC turn-on threshold at the desired AC line turn-on voltage for the ballast. Once the capacitor voltage
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