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參數(shù)資料
| 型號： | SG6980DZ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single-Stage PFC Controller |
| 中文描述： | POWER FACTOR CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | LEAD FREE, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 734K |
| 代理商： | SG6980DZ |
Product Specification
Single-Stage PFC Controller
OPERATION DESCRIPTION
SG6980
System General Corp.
Version 1.0.1 (IAO33.0064.B0)
- 11 -
www.sg.com.tw www.fairchildsemi.com
September 17, 2007
The highly integrated SG6980 is designed for a power
supply with boost PFC. It requires very few external
components to achieve high performance and includes
versatile protections / compensation.
The PFC function is implemented by average current
mode
control.
The
patented
multiplier-divider provides a high-degree of noise
immunity for the PFC circuit. This enables the PFC circuit
to operate over a much wider region. The proprietary
multi-vector output voltage control scheme provides a fast
transient response in a low-bandwidth PFC loop, in which
the overshoot and undershoot of the PFC voltage are
clamped. If the feedback loop is broken, the SG6980 shuts
off PFC to prevent extra-high voltage on output.
Programmable two-level high/low line compensation
optimizes THD performance.
switching-charge
In addition, SG6980 provides complete protection
functions, such as brownout and RI open/short.
Switching Frequency and Current
Sources
The switching frequency of SG6980 can be programmed
by the resistor R
I
connected between RI pin and GND.
The relationship is:
)
(
kHz
)
(k
I
R
1560
f
PWM
Ω
=
-------------
(1)
For example, a 24k
resistor R
I
results in a 65kHz
switching frequency. Accordingly, constant current I
T
flows through R
I
.
)
(
mA
)
(k
I
R
1.2V
T
I
Ω
=
----------------
(2)
I
T
is used to generate internal current reference.
If there is a SYNC signal input, the switching frequency is
defined by the SYNC signal. The SNYC frequency must
be larger than the programmed switching frequency,
less 6KHz.
Line Voltage Detection (V
RMS
)
Figure 1 shows a resistive divider with low-pass filtering
for line-voltage detection on the VRMS pin. The V
RMS
voltage is used for the PFC multiplier, brownout
protection, and RDY control.
For brownout protection, the SG6980 is disabled with
195ms delay time if the voltage V
RMS
drops below 0.8V.
For PFC multiplier and RDY control, please refer to
below sections for more detail.
FIG.1
PFC Output Voltage Control
For a universal input (90VAC ~ 264VAC) power supply
applying active boost PFC and forward as a second stage,
the output voltage of PFC is usually designed around 400V.
V
R
R
R
Vo
B
B
A
3
×
+
=
----
(3)
FIG.2 Output Voltage Setting
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