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PDF ICE2QS03 Data sheet ( Hoja de datos )
| Número de pieza | ICE2QS03 | |
| Descripción | Quasi-Resonant PWM Controller | |
| Fabricantes | Infineon Technologies | |
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Datasheet,Version 2.2, July 4, 2011
Quasi-Resonant
Controller
PWM
Power Management & Supply
Never stop thinking.
Free Datasheet http://www.nDatasheet.com
1 page  
Quasi-Resonant PWM Controller
ICE2QS03
Pin Configuration and Functionality
1 Pin Configuration and 1.3 Pin Functionality
Functionality
ZC (Zero Crossing)
At this pin, the voltage from the auxiliary winding after
a time delay circuit is applied. Internally, this pin is
1.1 Pin Configuration with PG-DIP- connected to the zero-crossing detector for switch-on
8 determination. Additionally, the output overvoltage
detection is realized by comparing the voltage Vzc with
an internal preset threshold.
Pin Symbol Function
1 ZC Zero Crossing
2 FB Feedback
3 CS Current Sense
4 HV High Voltage Input
5 HV High Voltage Input
6 GATE Gate Drive Output
7 VCC Controller Supply Voltage
8 GND Controller Ground
FB (Feedback)
Normally, an external capacitor is connected to this pin
for a smooth voltage VFB. Internally, this pin is
connected to the PWM signal generator for switch-off
determination (together with the current sensing
signal), the digital signal processing for the frequency
reduction with decreasing load during normal
operation, and the Active Burst Mode controller for
entering Active Burst Mode operation determination
and burst ratio control during Active Burst Mode
operation. Additionally, the open-loop / over-load
protection is implemented by monitoring the voltage at
this pin.
1.2 Package PG-DIP-8
ZC 1
8 GND
CS (Current Sense)
This pin is connected to the shunt resistor for the
primary current sensing, externally, and the PWM
signal generator for switch-off determination (together
with the feedback voltage), internally. Moreover, short-
winding protection is realised by monitoring the voltage
Vcs during on-time of the main power switch.
FB 2
CS 3
HV 4
7 VCC
GATE (Gate Drive Output)
This output signal drives the external main power
switch, which is a power MOSFET in most case.
6 GATE HV (High Voltage)
The pin HV is connected to the bus voltage, externally,
5 HV
and to the power cell, internally. The current through
this pin pre-charges the VCC capacitor with constant
current once the supply bus voltage is applied.
Figure 1 Pin Configuration PG-DIP-8(top view)
VCC (Power supply)
VCC pin is the positive supply of the IC. The operating
range is between VVCCoff and VVCCOVP.
GND (Ground)
This is the common ground of the controller.
Version 2.2
5 July 4, 2011
Free Datasheet http://www.nDatasheet.com
5 Page 
Quasi-Resonant PWM Controller
ICE2QS03
Functional Description
immediately after leaving Active Burst Mode. This is
helpful to decrease the output voltage undershoot.
VFB
VFBLB
VFBBOn
VFBBOff
Entering
Active Burst
Mode
Leaving
Active Burst
Mode
VFBEB
VCS
Blanking Window (tBEB)
t
1.0V
VCSB
VVCC
Current limit level
during Active Burst
Mode
t
VVCCoff
VO
Max. Ripple < 1%
t
IC is reset and the main power switch is then kept off.
After the VCC voltage falls below the threshold VVCCoff,
the startup cell is activated. The VCC capacitor is then
charged up. Once the voltage exceeds the threshold
VVCCon, the IC begins to operate with a new soft-start.
In case of open control loop or output over load, the
feedback voltage will be pulled up . After a blanking
time of 24ms, the IC enters auto-restart mode. The
blanking time here enables the converter to provide a
high power in case the increase in VFB is due to a
sudden load increase. During off-time of the power
switch, the voltage at the zero-crossing pin is
monitored for output over-voltage detection. If the
voltage is higher than the preset threshold vZCOVP, the
IC is latched off after the preset blanking time.
If the junction temperature of IC exceeds 140 °C, the IC
enter into autorestart mode.
If the voltage at the current sensing pin is higher than
the preset threshold vCSSW during on-time of the power
switch, the IC is latched off. This is short-winding
protection.
During latch-off protection mode, when the VCC
voltage drops to 10.5V,the startup cell is activated and
the VCC voltage is charged to 18V then the startup cell
is shut down again and repeats the previous procedure.
There is also an maximum on time limitation inside
ICE2QS03. Once the gate voltage is high longer than
tOnMAx, it is turned off immediately.
Figure 8 Signals in Active Burst Mode
t
3.6 Protection Functions
The IC provides full protection functions. The following
table summarizes these protection functions.
Table 2 Protection features
VCC Overvoltage
VCC Undervoltage
Overload/Open Loop
Over temperature
Output Overvoltage
Short Winding
Auto Restart Mode
Auto Restart Mode
Auto Restart Mode
Auto Restart Mode
Latched Off Mode
Latched Off Mode
During operation, the VCC voltage is continuously
monitored. In case of an under- or an over-voltage, the
Version 2.2
11
July 4, 2011
Free Datasheet http://www.nDatasheet.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ICE2QS03.PDF ] | |
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