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/Title (NCL30002 - Power Factor Corrected Buck LED Driver)
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BroadVision, Inc.
2020-08-26T09:22:33+02:00
2012-03-05T09:22:14-07:00
2020-08-26T09:22:33+02:00
application/pdf
NCL30002 - Power Factor Corrected Buck LED Driver
ON Semiconductor
The NCL30002 is a switch mode power supply controller intended
for low to medium power single stage power factor (PF) corrected
LED Drivers. The device operates as a critical conduction mode
(CrM) buck controller to regulate LED current at a high power factor
for a specific line voltage range. The current limit threshold is tightly
trimmed allowing open loop control techniques to reduce parts count
while maintaining accurate current regulation and high power factor.
CrM operation is particularly suited for LED applications as very high
efficiency can be achieved even at low power levels. These are
important in LED lighting to comply with regulatory requirements and
meet overall system luminous efficacy requirements. In CrM, the
switching frequency will vary with line and load. Switching losses are
low as recovery losses in the output rectifier are negligible since the
current goes to zero prior to reactivating the main MOSFET switch.
The device features a programmable on time limiter, zero current
detect sense block, gate driver, trans−conductance error amplifier as
well as all PWM control circuitry and protection functions required to
implement a CrM switch mode power supply. Moreover, for high
efficiency, the device features low startup current enabling fast, low
loss charging of the VCC capacitor. The current sense protection
threshold has been set at 485 mV to minimize power dissipation in the
external sense resistor. To support the environmental operation range
of Solid State Lighting, the device is specified across a wide junction
temperature range of −40°C to 125°C.
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