SG6980DZ Fairchild Semiconductor, SG6980DZ Datasheet - Page 14

no-image

SG6980DZ

Manufacturer Part Number
SG6980DZ
Description
IC PFC CTRLR AVERAGE CURR 16DIP
Manufacturer
Fairchild Semiconductor
Datasheets

Specifications of SG6980DZ

Mode
Average Current
Frequency - Switching
65kHz
Current - Startup
10µA
Voltage - Supply
12.5 V ~ 20 V
Operating Temperature
-20°C ~ 125°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Output Voltage
0.3 V to 25 V
Switching Frequency
68 KHz
Operating Temperature Range
- 20 C to + 125 C
Mounting Style
Through Hole
Duty Cycle (max)
98 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SG6980DZ
Manufacturer:
SG
Quantity:
20 000
Single-Stage PFC Controller
The average total input power can be expressed as:
From Equation 7, V
amplifier, controls the total input power and the power
delivered to the load.
Multi-Vector Error Amplifier
The voltage-loop error amplifier is transconductance,
which has high output impedance (> 90k : ). A capacitor
C
a dominant pole for the voltage loop. Although the PFC
stage has a low bandwidth voltage loop for better input
power factor, the innovative multi-vector error amplifier
provides a fast transient response to clamp the overshoot
and undershoot of the PFC output voltage. Figure 5 shows
the voltage loop with multi-vector for fast transient error
amplifier. When the variation of the feedback voltage
exceeds
transconductance error amplifier adjusts its output
impedance to increase the loop response. If the feedback
resistance is opened, SG6980D shuts off immediately to
prevent extra-high voltage on the output capacitor.
© System General Corp.
Version 1.0.1 (IAO33.0071.B0
Pin
v
v
v
f
1
EA
V
V
V
RMS
RMS
RMS
(1µF ~ 10µF) connected from VEA to ground provides
Vin
2
S
u
u
u
(
rms
I
I
MO
R
u
AC
Vin
V
r
AC
V
R
RMS
)
u
RMS
1
u
0
V
u
Iin
5%
EA
2
u
V
2
(
EA
C
rms
EA
v
)
of
EA
V
----------------------------
EA
, the output of the voltage error
the
reference
-------------- (7)
voltage,
(6)
the
- 14 -
FIG. 5 Voltage Error Amplifier with Multi-Vector
Cycle-by-Cycle Current Limiting
SG6980D provides cycle-by-cycle current limiting for PFC
stages. Figure 6 shows the peak current limit for the PFC
stage. The PFC gate drive is terminated once the voltage on
IPK pin goes below V
The voltage of V
relationship between V
The amplitude of the constant current I
the internal current reference I
equation:
Therefore the peak current of the I
Ip
I
S_peak
2
u
I
T
(Ip
www.sg.com.tw • www.fairchildsemi.com
u
2
R
RMS
u
FIG.6 Current Limit
R
P
1.2V
- )
S
PK
determines the voltage of V
R
PK
V
.
I
pk
and V
-----------------------
T
, according to the following
Product Specification
RMS
------------------
S
is given by:
is shown in Figure 6.
September 17, 2007
P
is determined by
SG6980D
PK
. The
(8)
(9)

Related parts for SG6980DZ