ICE3AR1580VJZ Datasheet, PDF (12/43 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

CoolSET™ F3R80
ICE3AR1580VJZ
Functional Description
VCC charge current is controlled to 0.9mA by the Startup Cell. When the V_VCC exceeds the on-threshold V_CCon=17V the
bias circuit are switched on. Then the Startup Cell is switched off by the Undervoltage Lockout and therefore no power
losses present due to the connection of the Startup Cell to the Drain voltage. To avoid uncontrolled ringing at switch-
on, a hysteresis start up voltage is implemented. The switch-off of the controller can only take place when VVCC falls
below 10.5V after normal operation was entered. The maximum current consumption before the controller is activated
is about 200µA.
When V_VCC falls below the off-threshold V_CCoff=10.5V, the bias circuit is switched off and the soft start counter is
reset. Thus it ensures that at every startup cycle the soft start starts at zero.
The internal bias circuit is switched off if Auto Restart Mode is entered. The current consumption is then
reduced to 320µA.
Once the malfunction condition is removed, this block will then turn back on. The recovery from Auto Restart Mode
does not require re-cycling the AC line.
When Active Burst Mode is entered, the internal Bias is switched off most of the time but the Voltage Reference is
kept alive in order to reduce the current consumption below 620µA.
3.3
Improved Current Mode
Soft-Start Comparator
FBB
C8
0.6V
PWM OP
x3.25
Improved
Current Mode
PWM-Latch
RQ
Driver
SQ
CS
Figure 5:
Current Mode
Current Mode means the duty cycle is controlled by the slope of the primary current. This is done by comparing the
FBB signal with the amplified current sense signal.
Amplified Current Signal
FBB
0.6V
Driver
t
t_on
t
Figure 6:
Pulse Width Modulation
In case the amplified current sense signal exceeds the FBB signal the on-time t_on of the driver is finished by
resetting the PWM-Latch (Figure 6).
Data Sheet
12
V2.0, 2014-01-20