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DISCRETE AND
STANDARD ICs GROUP
VIPer100™
by A. Russo
VIPower Product Marketing
AN ADVANCED MONOLITHIC SOLUTION FOR OFF-LINE SMPS PRIMARY CONVERTERS
F
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00
VI
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V
ollowing the ever increasing consumer
market needs for advanced, albeit cost
effective solutions for Off Line Switch Mode
Power Supplies, ST has developed the
VIPer100. It is the first of a family of monolithic
devices for SMPS applications using the
well consolidated VIPower M0 technology.
VIPer100 combines on the same silicon chip
a state-of-the-art PWM circuit with current
mode control and a dedicated compensation
path, together with an optimized high voltage
avalanche rugged Vertical Power MOSFET
(600V/3.5A).
Housed in the 5 pin TO-220, as well as in
the PowerSO-10 surface mounting package,
it offers maximum flexibility to designers
allowing both primary or secondary
regulation loop, despite using around 50%
less components than a discrete solution.
Start up of the circuit is insured by an internal
high voltage current source which is switched
off during normal operation. Adjustable
switching frequency up to 200KHz is achieved
by an external R-C network. Synchronisation
to an external clock generator is also possible.
A dedicated circuit for limiting the primary
current during the start up phase or overload
condition, gives a real power limitation and
correct soft start without any extra
components.
OSC
DRAIN
BK
Oscillator
Blanking
PWM
Reference
S1 R
RS
S2 S3
ENB
Surref
Ref 3
R
Q
CLK
Q
Driver
RS
S1 S2
OVT
ROK
0.5V
ENB
OVC
ENB
KVDD
VDD
STB
ID
Limitation
Ref 1
SOURCE
BK
Ref 2
Error
Amp
CTRL
Comparator
4.5V
Drain
PWM
BK
Current
sense
UV
Ref 4
VIPer100 block diagram
COMP
DECEMBER 1997
DISCRETE AND
STANDARD ICs GROUP
Built in overtemperature protection offers
additional safety and silicon self protection in
the case of abnormal operating conditions.
Burst mode operation is an additional feature
of this device, offering the possibility to operate
in stand by mode without extra components.
APPLICATIONS
The VIPer100 can be efficiently used for
implementing a current mode flyback
configuration in the discontinuous inductor
current mode. It has a maximum power
capability of 100W on a European voltage
range (180 to 270V AC) and 50W for a
universal input voltage range (85 to
270V AC).
Set top box, satellite receivers, decoders,
v i d e o re c o rd e r s , l a p t o p c o m p u t e r s ,
monitors, camcorders, television sets
represent only a smal selection of the
consumer products that can easily benefit
f ro m a l l t h e a d v a n t a g e s o f t h e b e s t
integrated solution available on the
market.
GREATER RELIABILITY
The increased overall reliability of the
system is great due to the approximate
50% reduction in the components
used with respect of a similar discrete
implementation and complete protection
built into the silicon.
TYPE
VDSS
VIPer100 600V
ID
3.5A
RDS(on)
2.8Ω
PACKAGE
PowerSO-10
PENTAWATT HV
VIPer100 Layout
VIPer100 FEATURES
Adjustable switching frequency up to
200KHz;
Optimized for current mode control topology;
Inherent feedforward compensation;
Soft-start and enable function;
Overcurrent protection;
Overtemperature protection;
Overvoltage protection;
Undervoltage lock-out with hysteresis;
Low stand-by current;
Integrated start-up supply;
Automatic burst mode operation in standby condition;
Internally trimmed Zener reference.
V
I
P
e
r
100
Vertical
Intelligent
Power
Enhanced
Regulator
Maximum
output power
to the load
2
DISCRETE AND
STANDARD ICs GROUP
ADVANTAGES vs MONOLITHIC SOLUTIONS
The additional advantages of VIPer100
when compared with existing monolithic
solution are numerous.
The useful duty cycle range extends from
0% to about 90% for VIPer100, versus
the 3% to 70% available on the
market. The main benefit for users is the
possibility to operate in stand-by
mode with nearly zero power output.
Larger regulation loop bandwidth.
VIPer100 provides a specific path for
compensation components (COMP pin),
offering a maximum of freedom for the
users to adjust the regulation bandwidth
with good repetitivity.
Excellent line regulation due to the current
mode control topology.
Better regulation point voltage because
of the higher value of this voltage when
compared with monolithic solutions
available on the market. This allows
greater precision of the output voltage
especially in the case of primary
regulation. A better saturation of the
output Power MOSFET at high current
values is also assured.
VDS (V)
VIPer100 - 50W Power Output
110KHz Switching Frequency
600
ID (A)
3
Voltage
Current
Unlike monolithic devices available
on the market the package tab is not
sensitive to external influences.
ADVANTAGES OF FLYBACK CONVERTERS
The main advantages of the Flyback
Converters operating in the discontinuous
inductor current mode are:
All outputs will track each other within
+/- 5 to 10% without post-regulation.
Dynamic cross-regulation is also very
good.
The flyback transformer used in the
discontinuous mode can be much smaller
because the inductive energy stored is
only 1/5 to 1/10 of the energy required
in comparable continuous mode circuits.
Load current in the Power MOSFET
output stage is zero during turn-on
avoiding turn on losses or turn-on
snubber circuits, conducted EMI is also
reduced.
Regulation loop is easy to compensate
because of the single pole (resulting in a
single capacitor filter).
Transient response is excellent.
VDS (V)
VIPer100 - 50W Power Output
Detail of a Switching Phase
ID (A)
600
3
Voltage
Current
2.5
500
400
2
400
2
300
1.5
300
1.5
200
1
200
1
100
0.5
100
0.5
500
0
0
-100
0
5,000
10,000
T (ns)
15,000
-0.5
20,000
2.5
0
0
-100
0
100
200
300
400
-0.5
500
T (ns)
3
DISCRETE AND
STANDARD ICs GROUP
TYPICAL APPLICATION CIRCUITS
Two typical application examples for
secondary and primary regulation are
shown. Both circuits are current mode
D2
T1
R1
Flyback Converters operating in the
discontinuous inductor current mode. For
both circuits the switching frequency is
equal to 100KHz.
L2
C3
+
C6
BR1 1
2
4
+
VCC+
C9
R4
R7
R8
C8 R6
C10
+
C7
D1
R5
VR1
+
C2
3
+
DRAIN
L1
RTN
VDD
R2
C1
OPTO1
D3
C4
VIPer100
85 to 270V AC input
50W output
OSC
C5
F1
SOURCE
COMP
R3
180 to 270V AC input
100W output
L
OPTO1
N
Off-Line Flyback SMPS with secondary regulation
D2
C7
+
+
C8
+
C7'
D1
+
3
L1
VCC +
C3
BR1 1
2
4
C2
L2
T1
R1
RTN
D3
C4
+
DRAIN
VDD
R2
VIPer100
C1
OSC
COMP
SOURCE
F1
C6
R3
C5
85 to 270V AC input
50W output
C6'
L
N
Off-Line Flyback SMPS with primary regulation
4
DISCRETE AND
STANDARD ICs GROUP
VIPer100
by A. Russo & R. Nicoloso - VIPower Prod. Mktg
& A. Bailly - Application Lab
ADVANCED MONOLITHIC SOLUTION FOR OFF-LINE SMPS PRIMARY CONVERTERS
A
fter the announcement of the first
silicon of the VIPer100 (see express
54) and the enthusiastic reaction of the
market,we can now forecast that the final
silicon will be ready for preproduction by
Q3'97. The VIPer100A, a new option with
a higher BVDSS will also be available soon.
The new devices provide an unparalleled
combination of performance, flexibility and
cost-effectiveness, delivering an output
power capability of 100W over the European
mains voltage range (180 to 270V AC) or
50W for a universal input voltage range
(85 to 270V AC), while using more than
50% fewer components than a discrete
solution.Key features of the VIPer100/100A
include automatic Burst Mode operation
in stand-by condition, an integrated startup supply, excellent line regulation due
to current mode operation, programmable
switching frequency (up to 200kHz) and
adjustable current limitation (up to 3A).
The automatic Burst Mode operation allows
the VIPer100/100A to meet the new German
“Blue Angel” Eco Norm with less than
1W total power consumption for the system
when working in stand-by. The datasheet
for VIPer100 family describes the operation
and suggests basic ideas and schematics
to implement specific functions. In order
to evaluate the performance of the VIPer100
ST has developed two demoboards.
Type
VDSS
ID
RDS(on)
Package
VIPer100/SP
VIPer100A/ASP
600V
670V
3A
3A
2.5
3.3
PowerSO-10
PENTAWATT
OSC
DRAIN
ON/OFF
VDD
OSCILLAT
OR
UVLO
LOGIC
SECURIT
LATCH Y PWM
LATCH
R/S F/F
Q
S
S
R1
F/F
Q
R2 R3
OVERTEM
P.
DETECTO
R
ERROR
AMPLIFIER
0.5V
14µs
delay
13V
0.5V
300ns
Blanking
4.5V
1V/A
CURREN
T
AMPLIFIER
COMP
SOURCE
JUNE 1997
DISCRETE AND
STANDARD ICs GROUP
VIPer100 STANDARD DEMOBOARD
The VIPer100 standard demoboard is a
wide voltage range input off-line single
switch Flyback, working at 100kHz and
allows the user to choose between primary
and secondary regulation. Primary regulation
is carried out by the auxiliary winding which
delivers the low level supply voltage on the
Vdd pin of the device. Secondary regulation
is achieved by an optocoupler directly from
secondary output voltage. It acts on the
COMP pin, and the auxiliary winding
delivers the low level supply voltage at a
lower value than when in primary regulation
configuration, thanks to R7. The internal
error amplifier is consequently saturated in
high state, sourcing a constant current of
about 0.5mA on the COMP pin. No power
limitation has been set on the VIPer device,
so the demoboard is able to deliver up to
130W in continuous running (for 5 seconds
max). The demoboard withstands the no
load condition and is fully protected against
F1
J1
AC IN
L1
2A
1
2
C6
0.1µF
400V
110/230V
R1
0.1µF
400V L2
Maximum output power
50W
DC output voltage/load
Vout = +12V, 4A
Operating frequency
100kHz
TR1
G6219-00
OREGA
+
D6
BYT11/400
C1
100µF
400V
220µH
TOKO
RN114-2/02
SCHAFFNER
20R
90-265V AC
D1
1A/400V
220µH
TOKO
C9
TR2
AC input voltage
D3
BYW81/100
C6
1000µF
16V
+
R2
10R
OSC
2
1
OUTPUT
C10
1nF
400V
3
C11
10nF
13V
COMP
ISO1
4N25
SOURCE
5
C4
4.7nF
POT1
1K
J2
12V DC
DRAIN
1
C3
22µF
16V
R7
4.7R
S1
2
VDD
+
D5
BZX55C10
GREEN LED
D2
1N444B
U1
VIPer100
R6
2K
1000µF
16V
D4
D7
BZW50-180
R4
3.9K
+ C7
4
C5
100nF
R5
5.1K
2
DISCRETE AND
STANDARD ICs GROUP
VIPer100 DEMOBOARD FOR
SET TOP BOX SMPS
The power supply is intended to
provide all the voltage used by the
set top box board. To guarantee
safety conditions, primary and
secondary components were
implemented in the opposite side
of the board. The components TR2,
ISO1, and C12 assure the isolation
between the primary and secondary
circuits, and are subject to safety
standards such as VDE and UL. In
order to reduce radiated EMI all
high current loops have been
minimized closing off the associated
components one from the other.
Output line
Voltage
Max current
Main and Tuner
+5.0V
2.3A
Tuner
+3.3V
0.2A
Tuner
+28.0V
0.05A
Main
+12.0V
0.5A
U3
LM317H
+3.3V
IN
OUT
ADJ
R7
1.2K
R5
89K
F1
MAINS
BR1
1A/400V
TR1
2A
D8
STPS745
2
C2
0.1µF
400V
D2
1.5KE200P
D3
+
C4
47µF
400V
RN114-2/02
SCHAFFNER
R4 47R
4
BYT11/400
D1
1N4448
TR2
OREGA
R1
+
U1
VIPer100
R2
5.6K
7
2
3
C3
4.7nF
+
470µF
16V
+28V
C9
U2
LM7812
IN
BYW98/100 + C8
1
OSC
4.7µF
16V
OUT
GND
1000µF
16V
220µF
35V
+
D6
BZX85C30V
+12V
C10
100µF
16V GND
C12
DRAIN
VDD
C7
D4
15
D7
LED
+5V
BYW100/200
16
C5
47µF
16V
10µH
+
2200µF
16V
14
D5
17
6
10
+ C11
L1
12 13
C6
R6
2K
R8
220
1nF
Class Y
13V
COMP
SOURCE
5
C14
1nF
C1
100nF
R3
4.7K
4
R9
180
ISO1
4N25
R11
1K
C13
15nF
R10
18K
U4
TL431
R12
18K
3