ICL8001G Infineon Technologies, ICL8001G Datasheet - Page 9

• Manufacturer Part Number: ICL8001G
• Description: SP000773086_DRIVER_TR_RO
• Manufacturer: Infineon Technologies

Specifications of ICL8001G

• Packages: PG-DSO-8
• Vds: -
• Rds (on): -

required maximum V
voltage can be calculated, which is shown in
Figure 5
According to the typical application circuit, when
MOSFET is turned on, a negative voltage proportional
to bus voltage will be coupled to auxiliary winding.
Inside ICL8001G, an internal circuit will clamp the
voltage on ZC pin to nearly 0V. As a result, the current
flowing out from ZC pin can be calculated as
When this current is higher than I
current exceeding this threshold is used to generate an
offset to decrease the maximum limit on V
ideal curve shown in
digital block in ICL8001G is implemented to get a better
control
advantage to use digital circuit is the production
tolerance is smaller compared to analog solutions. The
typical maximum limit on V
shown in
Figure 6
i
Version 1.0
I
ZC
0.9
0.8
0.7
0.6
1
0.9
0.8
0.7
0.6
80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
1
=
300
V
------------------------
R
of
Figure
BUS
ZC1
to the IZC current
Variation of the VCS limit voltage according
500
maximum
V
N
N
CS-max
P
700
a
6.
900
versus I
Figure 5
CS
1100
output
versus various input bus
Vin(V)
CS
Iz c(uA)
ZC
versus the ZC current is
1300
is a nonlinear one, a
ZC_1
power.
1500
, the amount of
1700
CS
. Since the
Additional
Figure
1900
Single-Stage Flyback and PFC Controller
2100
[5]
5.
9
3.5
The IC provides full protection functions. The following
table summarizes these protection functions.
Table 1
During operation, the VCC voltage is continuously
monitored. In case of an under- or an over-voltage, the
IC is reset and the main power switch is then kept off.
After the VCC voltage falls below the threshold V
the startup cell is activated. The VCC capacitor is then
charged up. Once the voltage exceeds the threshold
V
During off-time of the power switch, the voltage at the
zero-crossing pin is monitored for output over-voltage
detection. If the voltage is higher than the preset
threshold v
blanking time.
If the junction temperature of IC exceeds 140
enter into autorestart mode.
If the voltage at the current sensing pin is higher than
the preset threshold v
switch, the IC is latched off. This is short-winding
protection.
During latch-off protection mode, when the VCC
voltage drops to 10.5V,the startup cell is activated and
the VCC voltage is charged to 18V then the startup cell
is shut down again and repeats the previous procedure.
There is also a maximum on time limitation inside
ICL8001G. Once the gate voltage is high longer than
t
OnMAx
VCCon
VCC Overvoltage
VCC Undervoltage
Over temperature
Output Overvoltage
Short Winding
, it is turned off immediately.
, the IC begins to operate with a new soft-start.
ZCOVP
Protection Functions
Protection features
, the IC is latched off after the preset
CSSW
Functional Description
during on-time of the power
Auto Restart Mode
Auto Restart Mode
Auto Restart Mode
Latched Off Mode
Latched Off Mode
ICL8001G
May 6, 2010
0
C, the IC
VCCoff
,