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PDF ICE3BS02L Data sheet ( Hoja de datos )
| Número de pieza | ICE3BS02L | |
| Descripción | Off-Line SMPS Current Mode Controller | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Datasheet, Version 1.1, 28 Sep 2005
F3
ICE3BS02L
Off-Line SMPS Current Mode
Controller with integrated 500V
Startup Cell and Latched off Mode
Power Management & Supply
Never stop thinking.
1 page  
F3
ICE3BS02L
Pin Configuration and Functionality
1 Pin Configuration and Functionality
1.1 Pin Configuration with PG-DIP-8-6
1.2 Pin Functionality
Pin Symbol Function
1 SoftS Soft-Start
2 FB Feedback
3 CS Current Sense
4 HV High Voltage Input
5 HV High Voltage Input
6 Gate Driver Stage Output
7 VCC Controller Supply Voltage
8 GND Controller Ground
Package PG-DIP-8-6
SoftS
1
8 GND
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.
FB 2
Gate
The Gate pin is the output of the internal driver stage
7 VCC connected to the Gate of an external PowerMOS.
CS 3
HV (High Voltage)
6
Gate
The HV pin is connected to the rectified DC input voltage. It
is the input for the integrated 500V Startup Cell.
HV 4
5 HV
VCC (Power supply)
The VCC pin is the positive supply of the IC. The operating
range is between 8.5V and 21V.
Figure 1
Pin Configuration PG-DIP-8-6(top view)
Note: Pin 4 and 5 are shorted within the DIP 8 package.
GND (Ground)
The GND pin is the ground of the controller.
Version 1.1 5 28 Sep 2005
5 Page 
F3
ICE3BS02L
Functional Description
within a wide range. 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 14.4%. By means of propagation
delay compensation the overshoot is only about 2% (see
Figure 12).
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
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
SoftS
5kΩ RSoftS
4.4V
1
S1 G2
6.5V
Figure 12 Overcurrent Shutdown
The Propagation Delay Compensation is realized by means
of a dynamic threshold voltage Vcsth (see Figure 13). In case
of a steeper slope the switch off of the driver is earlier to
compensate the delay.
VOSC max. Duty Cycle
C3
5.4V
4.8V
C4
&
Auto
Restart
G5 Mode
off time
Active
Burst
Mode
VSense
Vcsth
Propagation Delay t
FB
1.32V
C5
&
G6
Control Unit
Signal1
Signal2
Figure 13 Dynamic Voltage Threshold Vcsth
t
3.6 Control Unit
The Control Unit contains the functions for Active Burst
Mode, Auto Restart Mode and Latched Off Mode. The
Active Burst Mode and the Auto Restart Mode are combined
Figure 14 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 now be charged further by the
integrated pull up resistor RSoftS. The comparator C3 releases
the gates G5 and G6 once VSofts has exceeded 5.4V.
Therefore there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor CSoftS. The
Version 1.1 11 28 Sep 2005
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ICE3BS02L.PDF ] | |
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