ICE3BR0665JZ Infineon Technologies, ICE3BR0665JZ Datasheet - Page 13

• Manufacturer Part Number: ICE3BR0665JZ
• Description: Off-Line SMPS Current Mode Controller
• Manufacturer: Infineon Technologies

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3.5.3
Figure 15
The driver-stage is optimized to minimize EMI and to
provide high circuit efficiency. The switch on speed is
slowed down before it reaches the integrated
CoolMOS
the rising edge at the output of the driver (see Figure
16).
Figure 16
Thus the leading switch on spike is minimized.
Furthermore the driver circuit is designed to eliminate
cross conduction of the output stage.
During power up, when VCC is below the undervoltage
lockout threshold V
is set to low in order to disable power transfer to the
secondary side.
Version 2.0
(internal)
V
PWM-Latch
Gate Driver
Gate
5V
®
turn on threshold. That is a slope control of
Gate Driver
VCC
1
Gate Driver
Gate Rising Slope
VCCoff
, the output of the Gate Driver
ca. t = 130ns
Gate
CoolMOS
t
®
13
3.6
Figure 17
There is a cycle by cycle peak current limiting operation
realized by the Current-Limit comparator C10. The
source current of the integrated CoolMOS
via an external sense resistor R
R
voltage V
V
comparator C10 immediately turns off the gate drive by
resetting the PWM Latch FF1.
A Propagation Delay Compensation is added to
support the immediate shut down of the integrated
CoolMOS
influence of the AC input voltage on the maximum
output power can be reduced to minimal.
In order to prevent the current limit from distortions
caused by leading edge spikes, a Leading Edge
Blanking is integrated in the current sense path for the
comparators C10, C12 and the PWM-OP.
The output of comparator C12 is activated by the Gate
G10 if Active Burst Mode is entered. When it is
activated, the current limiting is reduced to 0.34V. This
voltage level determines the maximum power level in
Active Burst Mode.
Sense
Sense
PWM Latch
FF1
PWM-OP
exceeds the internal threshold voltage V
Active Burst
the source current is transformed to a sense
Mode
Sense
®
G10
with very short propagation delay. Thus the
Current Limiting
&
Propagation-Delay
Current Limiting Block
which is fed into the CS pin. If the voltage
Compensation
CS
C10
C12
Functional Description
10k
ICE3BR0665JZ
0.34V
V
D1
Sense
csth
Current Limiting
. By means of
Blanking
Leading
12 Nov 2009
220ns
Edge
1pF
®
is sensed
csth,
the