IR3504MTRPBF International Rectifier, IR3504MTRPBF Datasheet - Page 25

• Manufacturer Part Number: IR3504MTRPBF
• Description: IC CTRL XPHASE3 SVID 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3504MTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IR3504
Open Remote Sense Line Protection
If either remote sense line VOSEN
+ or VOSEN
- is open, the output of Remote Sense Amplifier (VOUT
) drops.
X
X
X
The IR3504 continuously monitors the VOUT
pin and if VOUT
is lower than 200 mV, two separate pulse currents
X
X
are applied to the VOSEN
+ and VOSEN
- pins to check if the sense lines are open. If VOSEN
+ is open, a voltage
X
X
X
higher than 90% of V(VCCL) will be present at VOSEN
+ pin and the output of Open Line Detect Comparator will
X
be high. If VOSEN
- is open, a voltage higher than 400mV will be present at VOSEN
- pin and the Open Line
X
X
Detect Comparator output will be high. With either sense line open, the Open Sense Line Fault Latch will be set to
force the error amplifier output low and immediately shut down the converter. SS/DEL
will be discharged and the
X
Open Sense Fault Latch can only be reset by cycling the power to VCCL.
Open Daisy Chain Protection
The IR3504 checks the daisy chain every time it powers up. It starts a daisy chain pulse on the PHSOUT pin and
detects the feedback at PHSIN pin. If no pulse comes back after 30 CLKOUT pulses, the pulse is restarted again. If
the pulse fails to come back the second time, the Open Daisy Chain fault is registered, and SS/DEL
is not allowed
X
to charge. The fault latch can only be reset by cycling the power to VCCL.
After powering up, the IR3504 monitors PHSIN pin for a phase input pulse equal or less than the number of phases
detected. If PHSIN pulse does not return within the number of phases in the converter, another pulse is started on
PHSOUT pin. If the second started PHSOUT pulse does not return on PHSIN, an Open Daisy Chain fault is
registered.
Phase Number Determination
After a daisy chain pulse is started, the IR3504 checks the timing of the input pulse at PHSIN pin to determine the
phase number.
Page 25
July 28, 2009