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3BS02 Schematic ( PDF Datasheet ) - Infineon Technologies

Teilenummer 3BS02
Beschreibung ICE3BS02
Hersteller Infineon Technologies
Logo Infineon Technologies Logo 




Gesamt 23 Seiten
3BS02 Datasheet, Funktion
Datasheet, V1.1, 21 May 2004
F3
ICE3AS02 / ICE3BS02
ICE3AS02G / ICE3BS02G
Off-Line SMPS Current Mode
Controller with integrated 500V
Startup Cell
Power Management & Supply
Never stop thinking.






3BS02 Datasheet, Funktion
F3
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
Pin Configuration and Functionality
1.3 Pin Functionality
SoftS (Soft Start & Auto Restart Control)
The SoftS pin combines the functions of Soft Start
during Start Up and error detection for Auto Restart
Mode. These functions are implemented and can be
adjusted by means of an external capacitor at SoftS to
ground. This capacitor also provides an adjustable
blanking window for high load jumps, before the IC
enters into Auto Restart Mode.
FB (Feedback)
The information about the regulation is provided by the
FB Pin to the internal Protection Unit and to the internal
PWM-Comparator to control the duty cycle. The FB-
Signal controls in case of light load the Active Burst
Mode of the controller.
CS (Current Sense)
The Current Sense pin senses the voltage developed
on the series resistor inserted in the source of the
external PowerMOS. If CS reaches the internal
threshold of the Current Limit Comparator, the Driver
output is immediately switched off. Furthermore the
current information is provided for the PWM-
Comparator to realize the Current Mode.
Gate
The Gate pin is the output of the internal driver stage
connected to the Gate of an external PowerMOS.
HV (High Voltage)
The HV pin is connected to the rectified DC input
voltage. It is the input for the integrated 500V Startup
Cell.
VCC (Power supply)
The VCC pin is the positive supply of the IC. The
operating range is between 8.5V and 21V.
GND (Ground)
The GND pin is the ground of the controller.
Version 1.1
6 21 May 2004

6 Page









3BS02 pdf, datenblatt
F3
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
Functional Description
Current Limiting is now possible in a very accurate way.
E.g. Ipeak = 0.5A with RSense = 2. Without Propagation
Delay Compensation the current sense threshold is set
to a static voltage level Vcsth=1V. A current ramp of
dI/dt = 0.4A/µs, that means dVSense/dt = 0.8V/µs, and a
propagation delay time of i.e. tPropagation Delay =180ns
leads then to an Ipeak overshoot of 12%. By means of
propagation delay compensation the overshoot is only
about 2% (see Figure 13).
V
1,3
1,25
1,2
1,15
1,1
1,05
1
0,95
0,9
0
with compensation
without compensation
0,2 0,4 0,6 0,8
1 1,2 1,4 1,6 1,8
dVSense
dt
2V
µs
Figure 13 Overcurrent Shutdown
The Propagation Delay Compensation is realized by
means of a dynamic threshold voltage Vcsth (see Figure
14). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
VOSC max. Duty Cycle
VSense
Vcsth
off time
Propagation Delay
t
Figure 14
Signal1
Signal2
t
Dynamic Voltage Threshold Vcsth
3.6 Control Unit
The Control Unit contains the functions for Active Burst
Mode and Auto Restart Mode. The Active Burst Mode
and the Auto Restart Mode are combined with an
Adjustable Blanking Window which is depending on the
external Soft Start capacitor. By means of this
Adjustable Blanking Window, the IC avoids entering
into these two modes accidentally. Furthermore it also
provides a certain time whereby the overload detection
is delayed. This delay is useful for applications which
normally works with a low current and occasionally
require a short duration of high current.
3.6.1
Adjustable Blanking Window
SoftS
5k RSoftS
6.5V
4.4V
1
S1 G2
C3
5.4V
4.8V
C4
& Auto
Restart
G5 Mode
Active
Burst
Mode
FB
1.32V
C5
&
G6
Control Unit
Figure 15 Adjustable Blanking Window
VSoftS is clamped at 4.4V by the closed switch S1 after
the SMPS is settled. If overload occurs VFB is
exceeding 4.8V. Auto Restart Mode can’t be entered as
the gate G5 is still blocked by the comparator C3. But
after VFB has exceeded 4.8V the switch S1 is opened
via the gate G2. The external Soft Start capacitor can
Version 1.1
12 21 May 2004

12 Page





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