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PCMB065T-R68MS Arkusz danych(PDF) 25 Page - International Rectifier

Numer części PCMB065T-R68MS
Szczegółowy opis  6A Highly Integrated SupIRBuck
PDF  46 Pages
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Producent  IRF [International Rectifier]
Strona internetowa  http://www.irf.com
Logo IRF - International Rectifier

PCMB065T-R68MS Arkusz danych(HTML) 25 Page - International Rectifier

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- 25 -
JANURARY 18, 2013 | DATA SHEET | Rev 3.5
25
IR3898
6A Highly Integrated SupIRBuck
TM
Single-Input Voltage, Synchronous Buck Regulator
PD-97662
0.3V
0
0
0
Vp
Vsns
0.4V
PGood
0.9*Vp
1.2*Vp
1.28ms
Figure 16: Vp Tracking (Vref =0V)
Internal
SS
0
0
0
0
Vref
PGood
Vsns
(0.7V<Vp<3.3V)
0.5V
1.2*Vref
0.9*Vref
0
Vp
0.5V
1.28ms
Figure 17: Vp Sequence and Vref Margin
OVER-VOLTAGE PROTECTION (OVP)
OVP is achieved by comparing Vsns voltage to an OVP
threshold voltage. In non-tracking mode, OVP threshold
voltage is 1.2×Vref; in tracking mode, it is set at 1.2×Vp.
When Vsns exceeds the OVP threshold, an over voltage
trip signal asserts after 2us (typ.) delay. Then the control
FET is latched off immediately, PGood flags low. The
sync FET remains on to discharge the output capacitor.
When the Vsns voltage drops below the threshold, the
sync FET turns off to prevent the complete depletion of
the output capacitor. The control FET remains latched
off until user cycle either Vcc or Enable.
OVP comparator becomes active only when the device is
enabled. Furthermore, for OVP to be active Vref has to
exceed 0.2V in non-tracking mode, or Vp has to exceed
the threshold in tracking-mode, as illustrated in Fig 18a
and Fig 18b. If either of the above conditions is not satisfied,
OVP is disabled. Vsns voltage is set by the voltage divider
connected to the output and it can be programmed
externally. Figure 18c shows the timing diagram for OVP in
non-tracking mode.
1.2V
En
1.0V
Vref
0.2V
OVP active region
Figure 18a: Activation of OVP in non-tracking mode
1.2V
En
1.0V
Vp
0.4V
OVP active region
0.3V
Figure 18b: Activation of OVP in tracking mode
HDrv
0
0
0
LDrv
Vsns
1.2*Vref
0
PGood
1.15*Vref
Figure 18c: Timing Diagram for OVP in non-tracking mode



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