ICE2A180 Infineon Technologies Corporation, ICE2A180 Datasheet - Page 7

• Manufacturer Part Number: ICE2A180
• Manufacturer: Infineon Technologies Corporation

3
3.1
Figure 3
The Undervoltage Lockout monitors the external
supply voltage V
current consumption is max. 55µA. When the SMPS is
plugged to the main line the current through R
charges the external Capacitor C
exceeds the on-threshold V
circuit and the voltage reference are switched on. After
it the internal bandgap generates a reference voltage
V
uncontrolled ringing at switch-on a hysteresis is
implemented which means that switch-off is only after
active mode when Vcc falls below 8.5V.
In case of switch-on a Power Up Reset is done by
reseting the internal error-latch in the protection unit.
When V
internal reference is switched off and the Power Down
reset let T1 discharging the soft-start capacitor C
at pin SoftS. Thus it is ensured that at every switch-on
the voltage ramp at pin SoftS starts at zero.
Datasheet
Preliminary Data
REF
=6.5V to supply the internal circuits. To avoid
V C C
C
S o ftS
VCC
S oft-Start
8 .5 V
Functional Description
Power Management
falls below the off-threshold V
U n de rvolta g e
P o w er-U p
Power Management
P o w er-D ow n
R e se t
L o ckou t
R e set
T 1
R
6 .5 V
VCC
1 3 .5V
Soft-Sta rt
Pow er M anagem ent
. In case the IC is inactive the
R
M ain L in e (1 00 V -3 80 V )
S tart-U p
C
CCon
VC C
E rro r-L a tch
R
S
R efe ren ce
Preliminary Specification
In te rn a l
V o lta g e
=13.5V the internal bias
B ias
Q
Q
E rror-D ete ctio n
S o ft-S ta rt C om p ara tor
P rim ary W in ding
VCC
P W M -L atch
. When V
CCoff
6.5 V
5.3 V
4.8 V
4.0 V
=8.5V the
Soft-Start
Start-up
VCC
7
3.2
Figure 4
Current Mode means that the duty cycle is controlled
by the slope of the primary current. This is done by
comparison the FB signal with the amplified current
sense signal.
Figure 5
In case the amplified current sense signal exceeds the
FB signal the on-time T
reseting the PWM-Latch (see Figure 5).
0 .8 V
D rive r
F B
A m p lified C u rren t S ig n al
F B
S o ft-S ta rt C o m p a ra to r
Im proved
C urrent M ode
Improved Current Mode
Current Mode
Pulse Width Modulation
0 .8V
T
P W M O P
o n
P W M C o m p a ra to r
x3 .6 5
Functional Description
on
ICE2A165/265/365
of the driver is finished by
ICE2A180/280
CoolSET™-II
February 2001
P W M -L a tch
R
S
Ise n se
Q
Q
D rive r
t
t