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NCP5230MNTWG Datasheet(PDF) 8 Page - ON Semiconductor

Part # NCP5230MNTWG
Description  Precise Low Voltage Synchronous Buck
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5230MNTWG Datasheet(HTML) 8 Page - ON Semiconductor

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NCP5230
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8
VSEN
VTH
LG
BUFFER
VPU
Figure 4. PreOVP circuit
Vin Detection
During the soft start after the VSEN pin exceeds 80% Vref,
UV protection will be enabled; If a UV fault is triggered in
the softstart, it will restart SS after a fixed delay. The UV
protection is to avoid IC to startup without Vin or with
insufficient Vin voltage.
Overcurrent Protection
NCP5230 measures the differential current sensing signal
through CSP and CSN/VO pin. There are two current
protection levels: OCP1 and OCP2. If the differential
voltage across pin CSP and CSN/VO is over 20 mV (but
below 30 mV) for four consecutive cycles, OCP1 will be
tripped. Both UG and LG will be forced to low to turn off the
high side and low side FETs, it is a latched condition; If the
differential voltage across pin CSP and CSN is over 30 mV,
OCP2 will be tripped, the UG and LG will be pulled low and
latched immediately. Toggling VCC power or EN will reset
the Overcurrent protection.
The current sensing R/C network should be selected to
match the inductor time constant as below,
(RCS1 RCS2) @ C + L
DCR
(Notes: the actual RC network time constant may be
slightly higher)
Thus, OCP1 and OCP2 levels can be configured as,
OCP1 +
20 mV
DCR @
RCS1 ) RCS2
RCS2
OCP2 +
30 mV
DCR @
RCS1 ) RCS2
RCS2


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