DataSheet8.cn


PDF ( 数据手册 , 数据表 ) ICE2QR0665

零件编号 ICE2QR0665
描述 Off-Line SMPS Quasi-Resonant PWM Controller
制造商 Infineon Technologies
LOGO Infineon Technologies LOGO 


1 Page

No Preview Available !

ICE2QR0665 数据手册, 描述, 功能
Datasheet,Version 2.5, July 4, 2011
®
ICE2QR0665
Off-Line SMPS Quasi-Resonant
PWM Controller with integrated
650V CoolMOS® and startup cell in
DIP-8
Power Management & Supply
Never stop thinking.
http://www.Datasheet4U.com







ICE2QR0665 pdf, 数据表
CoolSET® - Q1
ICE2QR0665
Functional Description
3.3.1.1 Up/down counter
The up/down counter stores the number of the zero
crossing to be ignored before the main power switch is
switched on after demagnetisation of the transformer.
This value is fixed according to the feedback voltage,
VFB, which contains information about the output
power. Indeed, in a typical peak current mode control,
a high output power results in a high feedback voltage,
and a low output power leads to a low regulation
voltage. Hence, according to VFB, the value in the up/
down counter is changed to vary the power MOSFET
off-time according to the output power. In the following,
the variation of the up/down counter value according to
the feedback voltage is explained.
The feedback voltage VFB is internally compared with
three threshold voltages VRL, VRH and VRM, at each
clock period of 48ms. The up/down counter counts then
upward, keep unchanged or count downward, as
shown in Table 1.
Table 1 Operation of the up/down counter
vFB
Always lower than VFBZL
Once higher than VFBZL, but
always lower than VFBZH
Once higher than VFBZH, but
always lower than VFBR1
Once higher than VFBR1
up/down counter
action
Count upwards till
7
Stop counting, no
value changing
Count downwards
till 1
Set up/down
counter to 1
In the ICE2QR0665, the number of zero crossing is
limited to 7. Therefore, the counter varies between 1
and 7, and any attempt beyond this range is ignored.
When VFB exceeds VFBR1 voltage, the up/down counter
is initialised to 1, in order to allow the system to react
rapidly to a sudden load increase. The up/down
counter value is also intialised to 1 at the start-up, to
ensure an efficient maximum load start up. Figure 5
shows some examples on how up/down counter is
changed according to the feedback voltage over time.
The use of two different thresholds VFBZL and VFBZH to
count upward or downward is to prevent frequency
jittereing when the feedback voltage is close to the
threshold point. However, for a stable operation, these
two thresholds must not be affected by the foldback
current limitation (see Section 3.4.1), which limits the
VCS voltage. Hence, to prevent such situation, the
threshold voltages, VFBZL and VFBZH, are changed
internally depending on the line voltage levels.
clock
T=48ms
VFB
VFBR1
VFBZH
VFBZL
t
Up/down
counter
1
Case 1 4 5 6 6 6 6 5 4 3 1
Case 2 2 3 4 4 4 4 3 2 1 1
Case 3 7 7 7 7 7 7 6 5 4 1
t
Figure 5 Up/down counter operation
3.3.1.2 Zero crossing (ZC counter)
In the system, the voltage from the auxiliary winding is
applied to the zero-crossing pin through a RC network,
which provides a time delay to the voltage from the
auxiliary winding. Internally, this pin is connected to a
clamping network, a zero-crossing detector, an output
overvoltage detector and a ringing suppression time
controller.
During on-state of the power switch a negative voltage
applies to the ZC pin. Through the internal clamping
network, the voltage at the pin is clamped to certain
level.
The ZC counter has a minimum value of 0 and
maximum value of 7. After the internal MOSFET is
turned off, every time when the falling voltage ramp of
on ZC pin crosses the 100mV threshold, a zero
crossing is detected and ZC counter will increase by 1.
It is reset every time after the DRIVER output is
changed to high.
The voltage vZC is also used for the output overvoltage
protection. Once the voltage at this pin is higher than
the threshold VZCOVP during off-time of the main switch,
the IC is latched off after a fixed blanking time.
To achieve the switch-on at voltage valley, the voltage
from the auxiliary winding is fed to a time delay network
(the RC network consists of Dzc, Rzc1, Rzc2 and Czc as
shown in typical application circuit) before it is applied
to the zero-crossing detector through the ZC pin. The
needed time delay to the main oscillation signal Dt
should be approximately one fourth of the oscillation
period (by transformer primary inductor and drain-
source capacitor) minus the propagation delay from
Version 2.5
8 July 4, 2011
http://www.Datasheet4U.com







ICE2QR0665 equivalent, schematic
CoolSET® - Q1
ICE2QR0665
Electrical Characteristics
Fixed Switching Frequency in
Active Burst Mode
Max. Duty Cycle in Active Burst
Mode
fsB
DmaxB
39 52 65 kHz
- 0.5 -
4.3.9
Protection
Parameter
Symbol
VCC overvoltage threshold
Over Load or Open Loop
Detection threshold for OLP
protection at FB pin
VVCCOVP
VFBOLP
Over Load or Open Loop
Protection Blanking Time
tOLP_B
Output Overvoltage detection
threshold at the ZC pin
VZCOVP
Blanking time for Output
Overvoltage protection
tZCOVP
Threshold for short winding
protection
VCSSW
Blanking time for short-windding tCSSW
protection
Over temperature protection1) TjCon
min.
24.0
-
Limit Values
typ. max.
25.0
26.0
4.5 -
Unit
V
V
20
3.55
-
1.63
-
130
30
3.7
100
1.68
190
140
44
3.84
-
1.78
-
150
ms
V
ms
V
ns
°C
Test Condition
Note: The trend of all the voltage levels in the Control Unit is the same regarding the deviation except VVCCOVP
4.3.10
CoolMOS® Section
Parameter
Drain Source Breakdown Voltage
Symbol
V(BR)DSS
min.
650
Limit Values
typ. max.
--
Unit Test Condition
V Tj = 110°C
Drain Source On-Resistance
RDSon1
-
0.65
0.75
W
1.37
1.58
W
TTjj==12255°°CC1)
at ID = 2.5A
Effective output capacitance, energy Co(er)
related
-
261)
-
pF VDS = 0V to 480V
Rise Time
Fall Time
trise -
tfall -
302)
302)
-
-
ns
ns
1) The parameter is not subjected to production test - verified by design/characterization
2) Measured in a Typical Flyback Converter Application
Version 2.5
16
July 4, 2011
http://www.Datasheet4U.com










页数 21 页
下载[ ICE2QR0665.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
ICE2QR0665Off-Line SMPS Quasi-Resonant PWM ControllerInfineon Technologies
Infineon Technologies
ICE2QR0665GOff-Line SMPS Quasi-Resonant PWM ControllerInfineon Technologies
Infineon Technologies
ICE2QR0665ZOff-Line SMPS Quasi-Resonant PWM ControllerInfineon Technologies
Infineon Technologies

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap