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PDF VIPer53ESP-E Data sheet ( Hoja de datos )
| Número de pieza | VIPer53ESP-E | |
| Descripción | OFF-line Primary Switch | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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VIPer53EDIP - E
VIPer53ESP - E
OFF-line Primary Switch
Features
■ Switching frequency up to 300kHz
■ Current mode control with adjustable limitation
■ Soft start and shut-down control
■ Automatic burst mode in standby condition
(“Blue Angel“ compliant )
■ Undervoltage lockout with Hysteresis
■ Integrated start-up current source
■ Over-temperature protection
■ Overload and short-circuit control
■ Overvoltage protection
■ In compliance with the 2002/95/EC European
Directive
Description
The VIPer53E combines an enhanced current
mode PWM controller with a high voltage
MDMesh Power MOSFET in the same package.
Block diagram
OSC
PowerSO-10
DIP-8
Typical applications cover offline power supplies
with a secondary power capability ranging up to
30W in wide range input voltage, or 50W in single
European voltage range and DIP-8 package and
40W in wide range input voltage, or 65W in single
European voltage range and PowerSO-10
package, with the following benefits:
– Overload and short-circuit events
controlled by feedback monitoring and
delayed device reset;
– Efficient standby mode by enhanced pulse
skipping.
– Integrated start-up current source is
disabled during normal operation to reduce
the input power.
DRAIN
ON/OFF
OSCILLATOR
VDD
UVLO
COMPARATOR
8. 4/
11.5V
8V
OVERTEMP.
DETECTOR
PWM
LA TCH
R1 S
FF Q
R2
R3 R4 R5
125k
4V
BLANKING TIME
SELECTION
1V
PWM
COMPARATOR
150/400ns
BLANKING
0.5V
STANDBY
COMPARATOR
0.5V
OVERLOAD
COMPARATOR
4.4V
HC O MP
CURRENT
AMPLIFIER
Vcc
IC OMP
OVERVOLTAGE
COMPARATOR
18V
January 2006
TOVL
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1 page  
VIPer53EDIP - E / VIPer53ESP - E
Electrical characteristics
Table 5. Supply Section
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
VDSstart
Drain Voltage Starting
Threshold
VDD = 5V; IDD = 0mA
34 50 V
IDDch1
Startup Charging Current VDD = 0 ... 5V; VDS = 100V
Figure 9 on page 22
-12 mA
IDDch2 Startup Charging Current VDD = 10V; VDS = 100VFigure 9.
-2 mA
IDDchoff
Startup Charging Current VDD = 5V; VDS = 100VFigure 11.
in Thermal Shutdown
TJ > TSD - THYST
0
mA
IDD0
Operating Supply Current
Not Switching
Fsw = 0kHz; VCOMP = 0V
8 11 mA
Operating Supply Current
IDD1 Switching
Fsw=100kHz
9 mA
VDDoff
VDD Undervoltage
Shutdown Threshold
Figure 9 on page 22
7.5 8.4 9.3 V
VDDon VDD Startup Threshold Figure 9.
10.2 11.5 12.8 V
VDDhyst
VDD Threshold
Hysteresis
Figure 9.
2.6 3.1
V
VDDovp
VDD Overvoltage
Shutdown Threshold
Figure 9.
17 18 19 V
Table 6.
Symbol
Pwm Comparator Section
Parameter
Test Conditions
HCOMP ∆VCOMP / ∆IDPEAK
VCOMPos VCOMP Offset
IDlim
Peak Drain Current
Limitation
IDmax
td
Drain Current
Capability
Current Sense Delay
to Turn-Off
VCOMP = 1 ... 4 V Figure 14.
dID/dt = 0
dID/dt = 0 Figure 14.
ICOMP = 0mA; VTOVL = 0V
Figure 14.
dID/dt = 0
VCOMP = VCOMPovl; VTOVL = 0V
dID/dt = 0
ID = 1A
VCOMPbl
VCOMP Blanking Time
Change Threshold
Figure 10 on page 22
tb1 Blanking Time
tb2 Blanking Time
tONmin1 Minimum On Time
VCOMP < VCOMPBLFigure 10.
VCOMP > VCOMPBLFigure 10.
VCOMP < VCOMPBL
Min. Typ. Max. Unit
1.7 2 2.3 V/A
0.5 V
1.7 2 2.3 A
1.6 1.9 2.3 A
250 ns
1V
300 400 500 ns
100 150 200 ns
450 600 750 ns
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VIPer53EDIP - E / VIPer53ESP - E
7 Standby Mode
Standby Mode
The device offers a special feature to address the low load condition. The corresponding
function described hereafter consists of reducing the switching frequency by going into burst
mode, with the following benefits:
– It reduces the switching losses, thus providing low consumption on the mains lines.
The device is compliant with “Blue Angel” and other similar standards, requiring less
than 0.5 W of input power when in standby.
– It allows the regulation of the output voltage, even if the load corresponds to a duty
cycle that the device is not able to generate because of the internal blanking time,
and associated minimum turn on.
For this purpose, a comparator monitores the COMP pin voltage, and maintains the PWM
latch and the Power MOSFET in the Off state as long as VCOMP remains below 0.5V (See
Block Diagram on page 2). If the output load requires a duty cycle below the one defined by
the minimum turn on of the device, the VCOMP net decreases its voltage until it reaches this
0.5V threshold (VCOMPoff). The Power MOSFET can be completely Off for some cycles, and
resumes normal operation as soon as VCOMP is higher than 0.5V. The output voltage is
regulated in burst mode. The corresponding ripple is not higher than the nominal one at full
load.
In addition, the minimum turn on time which defines the frontier between normal operation
and burst mode changes according to VCOMP value. Below 1.0V (VCOMPbl), the blanking
time increases to 400ns, whereas for higher voltages, it is 150ns Figure 10 on page 22 The
minimum turn on times resulting from these values are respectively 600 ns and 350 ns,
when taking into account internal propagation time. This brutal change induces an
hysteresis between normal operation and burst mode as shown on Figure 10 on page 22
When the output power decreases, the system reaches point 2 where VCOMP equals
VCOMPbl. The minimum turn-on time passes immediately from 350ns to 600ns, exceeding
the effective turn-on time that should be needed at this output power level. Therefore the
regulation loop will quickly drive VCOMP to VCOMPoff (Point 3) in order to pass into burst
mode and to control the output voltage. The corresponding hysteresis can be seen on the
switching frequency which passes from FSWnom which is the normal switching frequency set
by the components connected to the OSC pin and to FSWstby. Note: This frequency is
actually an equivalent number of switching pulses per second, rather than a fixed switching
frequency since the device is working in burst mode.
As long as the power remains below PRST the output of the regulation loop remains stuck at
VCOMPsd and the converter works in burst mode. Its “density” increases (i.e. the number of
missing cycles decreases) as the power approaches PRST and finally resumes normal
operation at point 1. The hysteresis cannot be seen on the switching frequency, but it can be
seen in the sudden surge of the COMP pin voltage from point 3 to point 1 at that power
level.
The power points value PRST and PSTBY are defined by the following formulas:
PRST
=
12--
•
FSWnom
•
(tb1
+
2
td)
•
V2IN
•
L--1--p--
PSTBY = 12-- • FSWnom • Ip2(VCOMPbl ) • Lp
DocRev1
11/31
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet VIPer53ESP-E.PDF ] | |
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