ncl30051 ON Semiconductor, ncl30051 Datasheet - Page 12

• Manufacturer Part Number: ncl30051
• Description: Ncl30051 Product Preview Two Stage Pfc And Resonant Half Bridge Controller Combo For Led Lighting
• Manufacturer: ON Semiconductor

the supply voltage for the high side driver. Once HDRVlo
turns on, the HVS pin is effectively grounded through the
external power switch. This allows C
Once HDRVlo turns off, HVS floats high and D
reversed biased. An undervoltage detector monitors the
HBoost voltage. Once the HBoost voltage is greater than
V
The low side driver generally starts before the high side
driver because the boost voltage is generated by the low
side driver switch transitions.
impedances are typically 75 and 15 W, respectively. The
half−bridge high side driver source and sink impedances
are typically 75 and 15 W, respectively. Depending on the
Boost(UV)
A boost circuit comprised of D
The half−bridge low side driver source and sink
, typically, 6.1 V, the high side driver is enabled.
boost
boost
and C
to charge to V
boost
generates
boost
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CC
is
.
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external MOSFETs gate charge requirements, an external
driver may be needed to drive the low and high side power
switches.
Analog and Power Ground
ground, PGND, terminal. GND is used for analog
connections such as VREF and OSC. PGND is used for
high current connections such as the gate drivers. It is
recommended to have independent analog and power
ground planes and connect them at a single point,
preferably at the ground terminal of the system. This will
prevent high current flowing on PGND from injecting
noise in GND. The PGND connection should be as short
and wide as possible to reduce inductance−induced spikes.
The NCL30051 has an analog ground, GND, and a power