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ICE2A0565 Datasheet(PDF) 10 Page - Infineon Technologies AG

Part No. ICE2A0565
Description  Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

ICE2A0565 Datasheet(HTML) 10 Page - Infineon Technologies AG

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Version 2.6
10
25 Dec 2006
CoolSET™-F2
Functional Description
3
Functional Description
3.1
Power Management
Figure 6
Power Management
The Undervoltage Lockout monitors the external
supply voltage VVCC. In case the IC is inactive the
current consumption is max. 55µA. When the SMPS is
plugged to the main line the current through RStart-up
charges the external Capacitor CVCC. When VVCC
exceeds the on-threshold VCCon=13.5V the internal bias
circuit and the voltage reference are switched on. After
that the internal bandgap generates a reference
voltage VREF=6.5V to supply the internal circuits. To
avoid 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
resetting the internal error-latch in the protection unit.
When VVCC falls below the off-threshold VCCoff=8.5V the
internal reference is switched off and the Power Down
reset let T1 discharging the soft-start capacitor CSoft-Start
at pin SoftS. Thus it is ensured that at every switch-on
the voltage ramp at pin SoftS starts at zero.
3.2
Improved Current Mode
Figure 7
Current Mode
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 8
Pulse Width Modulation
In case the amplified current sense signal exceeds the
FB signal the on-time Ton of the driver is finished by
resetting the PWM-Latch (see Figure 8).
The primary current is sensed by the external series
resistor RSense inserted in the source of the integrated
CoolMOS™. By means of Current Mode regulation, the
Internal
Bias
Voltage
Reference
6.5V
4.8V
Undervoltage
Lockout
13.5V
8.5V
Power-Down
Reset
Power-Up
Reset
Power Management
5.3V
4.0V
T1
PWM-Latch
R
S
Q
Q
Error-Latch
SoftS
6.5V
Error-Detection
VCC
Main Line (100V-380V)
Primary Winding
Soft-Start Comparator
C
VCC
R
Soft-Start
R
Start-Up
C
Soft-Start
x3.65
PWM OP
Improved
Current Mode
0.8V
PWM Comparator
PWM-Latch
Isense
FB
R
S
Q
Q
Driver
Soft-Start Comparator
t
FB
Amplified Current Signal
T
on
t
0.8V
Driver


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