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參數(shù)資料
| 型號： | IR3009 |
| 廠商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龍，速龍，或控制IC的VR10.X |
| 文件頁數(shù)： | 14/39頁 |
| 文件大?。?/td> | 693K |
| 代理商： | IR3009 |
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IR3093
Page 14 of 39
07/15/04
VCC Under Voltage Lockout (UVLO)
The VCC UVLO function monitors the IR3093’s VCC supply pin and ensures enough voltage is available to power the
internal circuitry. During power-up the fault latch is reset when VCC exceeds 7.9V and all other faults are cleared. The
fault latch is set when VCC drops below 7.4V and SS/DEL is below 3.75V.
5VUVL Under Voltage Lockout (5VUVL)
The 5VUVL function is provided for converters using a separate voltage supply other than VCC for gate driver bias.
The 5VUVL comparator prevents operation by discharging SS/DEL below 3.75V to force EAOUT low. The 5VUVL
comparator has an OK threshold of 4.36V ensuring adequate gate drive voltage is present and a fault threshold of
4.17V.
Power Good Output
The PWRGD pin is an open-collector output and should be pulled up to a voltage source through a resistor. During soft
start, the PWRGD remains low until the output voltage is in regulation and SS/DEL is above 3.75V. The PWRGD pin
becomes low if the fault latch is set. A high level at the PWRGD pin indicates that the converter is in operation and has
no fault, but does not ensure the output voltage is within the specification. Output voltage regulation within the design
limits can logically be assured however, assuming no component failure in the system.
Tri-State Gate Drivers
The GATELX drivers can pull down up to 3.5A peak current and source up to 1.5A. The GATEHX drivers can source
and sink up to 1.5A peak current. An adaptive non-overlap circuit monitors the voltage on the GATEHX and GATELX
pins to prevent MOSFET shoot-through current while minimizing body diode conduction.
The Error Amplifier output of the Control IC drives low in response to any fault condition such as VCC input under
voltage or output overload. The 0% duty cycle comparator detects this and drives both gate outputs low. This tri-state
operation prevents negative inductor current and negative output voltage during power-down.
The Gate Drivers revert to a high impedance “off” state at VCCLX and VCCHX supply voltages below the normal
operating range. An 80k
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from rising due to leakage or other cause under these conditions.
Over Voltage Protection (OVP)
The output Over-Voltage Protection comparator monitors the output voltage through the OVPSNS pin, the positive
remote sense point. If OVPSNS exceeds VDAC plus 150mV (for VR-10.0, 450mV for OPTERON and ATHLON,
selected with the VID_SEL pin), both GATEL pins drive high and the OVP pin sources 75uA current. The OVP circuit
over-rides the normal PWM operation and will fully turn-on the low side MOSFET within approximately 150ns. The low
side MOSFET will remain ON until the over-voltage condition ceases. The lower MOSFETs alone can not clamp the
output voltage however an SCR or N-MOSFET could be triggered with the OVP pin to prevent processor damage.
In the event of a high side MOSFET short, the OVP flag is activated with as little supply voltage as possible. The
OVPSNS pin is compared against both VCC and 5VUVL for OVP conditions at power-up. VCC is monitored for
conversion off 12V, 5VUVL is monitored for conversion off 5V. The OVP pin flags a voltage greater than 0.5V with
supply voltages as low as 1.0V. This headroom voltage varies inversely with temperature. An external comparator
can be used to disable the silver box, activate a crowbar, or supply source.
The overall system must be considered when designing for OVP. In many cases the over-current protection of the AC-
DC or DC-DC converter supplying the multiphase converter will be triggered thus providing effective protection without
damage as long as all PCB traces and components are sized to handle the worst-case maximum current. If this is not
possible, a fuse can be added in the input supply to the multiphase converter.
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