IR3513Z International Rectifier Corp., IR3513Z Datasheet - Page 22

• Manufacturer Part Number: IR3513Z
• Description: Xphase3tm Pol Control Ic
• Manufacturer: International Rectifier Corp.

Pre-charging of the converter output voltage may trigger OVP. If the converter output is pre-charged above 1.73V as
shown in Figure 17, ROSC/OVP pin voltage will be higher than 1.6V when VCCLDRV voltage reaches 1.8V.
ROSC/OVP pin voltage will be VCCLDRV-1V and rise with VCCLDRV voltage until VCCL is above UVLO threshold,
after which ROSC/OVP pin voltage will be VCCL-1V. The converter cannot start unless the over voltage condition stops
and VCCL is cycled. If the converter output is pre-charged 130mV above VREF but lower than 1.73V, as shown in
Figure 17, the converter will soft start until SS/DEL voltage is above 3.92V (4.0V-0.08V). Then, over voltage comparator
is activated and fault latch is set.
Page 22
Figure 14 - Over-voltage protection with pre-charging converter output VREF + 0.13V <Vo < 1.73V
VCCLDRV
OUTPUT
VOLTAGE
(VOSEN+)
VCCL UVLO
ROSC/OVP
VCC
Figure 13 - Over-voltage protection with pre-charging converter output Vo > 1.73V
12V
VCCL+0.7V
VCCL+0.7V
1.8V
1.73V
1.6V
May 11, 2009
IR3513Z