NCP1612B(2016) Просмотр технического описания (PDF) - ON Semiconductor
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NCP1612B Datasheet PDF : 33 Pages
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NCP1612A, NCP1612B, NCP1612A1, NCP1612A2, NCP1612A3, NCP1612B2
Table 1. FIVE NCP1612 VERSIONS
Part Number
Typical UVLO
Hysteresis
Condition for
BUV Tripping
(typical threshold)
NCP1612A
1.5 V
VFOVP <76%.VREF
NCP1612A1
1.5 V
VFOVP <40%.VREF
NCP1612A2
1.5 V
VFB <76%.VREF
NCP1612A3
1.5 V
VFOVP <40%.VREF
NCP1612B
8.0 V
VFOVP <76%.VREF
NCP1612B2*
8.0 V
VFB <76%.VREF
*Please contact local sales representative for availability
Maximum
Dead−time
(typical value)
48.5 ms
48.5 ms
48.5 ms
41.5 ms
48.5 ms
48.5 ms
Condition for
Latching−off
(typical threshold)
VpfcOK >7.5 V
VpfcOK >7.5 V
VFOVP>107%.VREF
VpfcOK >7.5 V
VpfcOK >7.5 V
VFOVP>107%.VREF
UVP2 if
VFOVP<VUVP2
YES
YES
NO
YES
YES
NO
Dynamic Re-
sponse
Enhancer (DRE)
Disabled until
pfcOK turns high
Disabled until
pfcOK turns high
Disabled until
pfcOK turns high
Disabled until
pfcOK turns high
Enabled as soon
as the circuit
turns on to
speed−up the
startup phase
Enabled as soon
as the circuit
turns on to
speed−up the
startup phase
Recommended Applications:
• The NCP1612B and NCP1612B2 large UVLO hysteresis (6 V minimum) avoids the need for large VCC capacitors and
help shorten the start−up time without the need for too dissipative start−up elements in self−powered PFC applications
(where high−impedance start−up resistors are generally implemented to pre−charge the VCC capacitor).
• The A, A1, A2 and A3 versions are preferred in applications where the circuit is fed by an external power source (from
an auxiliary power supply or from a downstream converter). Its maximum start−up level (11.25 V) is set low enough so
that the circuit can be powered from a 12−V voltage rail.
• A2 and B2 versions are to be preferred when a signal other than a portion of the output voltage is applied to the FOVP
pin (e.g., a voltage representative of the output voltage provided by an auxiliary winding) and/or if the pfcOK pin
voltage must be able to rise up to the VCC level without latching the part. Note that with the A2 and B2 versions, the
fast OVP protection latches−off the circuit when triggered.
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