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参数资料
| 型号： | NCP1652L48VGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/34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
V IN
TRIG
DRV
V OUT
NCP4303
OUTB
NCP1652
OUTA
Figure 57. NCP1652 and NCP4302 based single stage PFC with synchronous rectification.
The NCP1652 incorporates a secondary driver, OUTB,
with adjustable non overlap delay for controlling a
synchronous rectifier switch in the secondary side, an active
clamp switch in the primary or both. In addition, the
controller features a proprietary Soft ? Skip ? to reduce
acoustic noise at light loads. Other features found in the
NCP1652 include a high voltage startup circuit, voltage
feedforward, brown out detector, internal overload timer,
latch input and a high accuracy multiplier.
NCP1652 PFC Loop
The NCP1652 incorporates a modified version of average
current mode control used for achieving the unity power
factor. The PFC section includes a variable reference
generator, a low frequency voltage regulation error
amplifier (AC error AMP), ramp compensation (Ramp
Comp) and current shaping network. These blocks are
shown in the lower portion of the bock diagram (Figure 51).
The inputs to the reference generator include feedback
signal (FB), scaled AC input signal (AC_IN) and
feedforward input (V FF ). The output of the reference
generator is a rectified version of the input sine ? wave scaled
by the FB and V FF values. The reference amplitude is
proportional to the FB and inversely proportional to the
square of the V FF . This, for higher load levels and/or lower
input voltage, the signal would be higher.
The function of the AC error amp is to force the average
current output of the current sense amplifier to match the
reference generator output. The output of the AC error
amplifier is compensated to prevent response to fast events.
This output (V error ) is fed into the PWM comparator through
a reference buffer. The PWM comparator sums the V error and
the instantaneous current and compares it to a 4.0 V
compensation is also added to the input signal to allow CCM
operation above 50% duty cycle.
High Voltage Startup Circuit
The NCP1652 internal high voltage startup circuit
eliminates the need for external startup components and
provides a faster startup time compared to an external
startup resistor. The startup circuit consists of a constant
current source that supplies current from the HV pin to the
supply capacitor on the V CC pin (C CC ). The startup current
(I start ) is typically 5.5 mA.
The OUTA and OUTB drivers are enabled and the startup
current source is disabled once the V CC voltage reaches
V CC(on) , typically 15.3 V. The controller is then biased by
the V CC capacitor. The drivers are disabled if V CC decays to
its minimum operating threshold (V CC(off) ) typically 10.3 V.
Upon reaching V CC(off) the gate drivers are disabled. The
V CC capacitor should be sized such V CC is kept above
V CC(off) while the auxiliary voltage is building up.
Otherwise, the system will not start.
The controller operates in double hiccup mode while in
overload or V CC(off) . A double hiccup fault disables the
drivers, sets the controller in a low current mode and allows
V CC to discharge to V CC(off) . This cycle is repeated twice to
minimize power dissipation in external components during
a fault event. Figure 58 shows double hiccup mode
operation. A soft ? start sequence is initiated the second time
V CC reaches V CC(on) . If the controller is latched upon
reaching V CC(on) , the controller stays in hiccup mode.
During this mode, V CC never drops below V CC(reset) , the
controller logic reset level. This prevents latched faults to be
cleared unless power to the controller is completely
removed (i.e. unplugging the supply from the AC line).
threshold to provide the desired duty cycle control. Ramp
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