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参数资料
| 型号： | NCP1652L48VGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 100W 48V NCP1652 PFC |
| 产品变化通告： | 1Q2012 Discontinuation 30/Mar/2012 |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | NCP1652L48VGEVB-ND NCP1652L48VGEVBOS |
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NCP1652, NCP1652A
RI AVG
A CA +
The gain of the low frequency current buffer is set by the
resistor at the I AVG pin, R IAVG . R IAVG sets the scaling factor
between the primary peak and primary average currents.
The gain of the current sense amplifier, A CA , is given by
Equation 5.
(eq. 5)
4k
The current sense signal is prone to leading edge spikes
during the main switch turn on due to parasitic capacitance
and inductance. This spike may cause incorrect operation of
the PWM Comparator. Filtering the current sense signal will
inevitably change the shape of the current pulse. The
NCP1652 incorporates LEB circuitry to block the first
200 ns (typical) of each current pulse. This removes the
Oscillator
The oscillator controls the switching frequency, f , the jitter
frequency and the gain of the multiplier. The oscillator ramp
is generated by charging the timing capacitor on the CT Pin,
C T , with a 200 m A current source. This current source is
tightly controlled during manufacturing to achieve a
controlled and repeatable oscillator frequency. The current
source turns off and C T is immediately discharged with a
pull down transistor once the oscillator ramp reaches its peak
voltage, V CT(peak) , typically 4.0 V. The pull down transistor
turns off and the charging current source turns on once the
oscillator ramp reaches its valley voltage, V CT(valley) .
Figure 64 shows the resulting oscillator ramp and control
circuitry.
leading edge spikes without altering the current signal
waveform.
VDD
x 1.2
To PWM
comparator
I AVG
To PWM skip
comparator
R IAVG
VDD
C T
C T
+
4.0 V / 0.1 V
Oscillator
Figure 64. Oscillator Ramp and Control Circuitry
The relationship between the oscillator frequency in kHz
and timing capacitor in pF is given by Equation 6.
A low frequency oscillator modulates the switching
frequency, reducing the controller EMI signature and
C T +
47000
f
(eq. 6)
allowing the use of a smaller EMI filter. The frequency
modulation or jitter is typically ± 5% of the oscillator
frequency.
http://onsemi.com
26
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