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NXP Semiconductors
SSL1750
SMPS control IC for LED drivers
In frequency reduction mode the PFC controller is switched to burst mode operation and
the ?yback maximum frequency changes linearly with the control voltage on pin FBCTRL
(see Figure 9 ). For stable on-off switching of the PFC burst mode pin FBCTRL has a
50 mV (typ) hysteresis. At no load operation the switching frequency of the ?yback can be
reduced to (almost) zero.
f sw(fb)max
switching frequency
PFC burst mode
frequency
reduction
PFC on
discontinuous
with valley
switching
quasi resonant
Fig 9.
1.5 V
Frequency control of ?yback part
V FBCTRL
014aaa026
7.3.2 Valley switching (pin HV)
See Figure 10 . A new cycle starts when the external MOSFET is activated. After the
on-time (determined by the FBSENSE voltage and the FBCTRL voltage), the MOSFET is
switched off and the secondary stroke starts. After the secondary stroke, the drain voltage
shows an oscillation with a frequency of approximately, see Equation 2
1
----------------------------------------------------
( 2 × π × ( L p × C d ) )
(2)
where L p is the primary self-inductance of the ?yback transformer and C d is the
capacitance on the drain node.
As soon as the internal oscillator voltage is high again and the secondary stroke has
ended, the circuit waits for the lowest drain voltage before starting a new primary stroke.
Figure 10 shows the drain voltage, valley signal, secondary stroke signal, and the internal
oscillator signal.
Valley switching allows high frequency operation as capacitive switching losses are
reduced, see Equation 3 . High frequency operation makes small and cost-effective
magnetics possible.
? P = 1 --- × C × V 2 × f ?
? ?
2
SSL1750_1
d
(3)
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
14 of 29
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相关代理商/技术参数
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SSL1A12ND 制造商:Schneider Electric 功能描述:SSR Slim 1 Chann, 2A@24-280VAC zero, 38-72VDC
SSL1D03BD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 3.5A@1-24VDC, 15-30VDC
SSL1D03JD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 3.5A@1-24VDC, 3-12VDC
SSL1D101BD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 0.1A@1-48VDC, 16-30VDC
SSL1D101JD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 0.1A@1-48VDC, 3-12VDC
SSL1D101ND 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 0.1A@1-48VDC, 38-72VDC