The new VIPer53E includes a PWM driver, an
MDmesh MOSFET, a start-up high voltage current
source and several on-chip protection circuits.
The VIPer53E is an alternative choice to the VIPer53
when only the secondary regulation is required in
a power supply. Like the standard VIPer53, the new
version is housed in surface mounting DIP-8 and
PowerSO-10 packages.
The higher V
DD
voltage range brings flexibility in
designing the transformer. In fact in secondary
regulation VIPer53E V
DD
voltage extends from 9V
to 18V, while in the VIPer53 it goes from 9V to 14.5V
and this wide voltage range can follow fast load
variations. The extended V
DD
is implemented by
eliminating an internal error amplifier.
Thanks to the MDmesh MOSFET with a breakdown
voltage of 620V, an R
DS(on)
of 1鈩?at 25擄C and a
typical handling output power of 40W for a 85 to
265Vac voltage mains. For this level of power the
device does not require a heat-sink.
The total power consumption of the converter is less
than 0.5W for the system when working in stand-by
mode. This means power supply designers can easily
meet the Blue Angel Eco or Energy Star Program.
Automatic burst mode for very low consumption
in stand-by conditions (less than 500mW);
Integrated high voltage start-up current source;
Overload and short circuit control;
Over-voltage protection at 18V;
Over-temperature shutdown;
Under-voltage protection;
Current mode control with adjustable drain current
limitation;
Externally set switching frequency, up to 300kHz.
OSC
DRAIN
ON/OFF
oscillator
PWM
Latch
VIPer53E
blanking time
selection
1V
0.5V
150/400ns
blanking
8V
4V
H
COMP
P/N
VIPer53EDIP
VIPer53ESP
Input Mains
195-265Vac
85-265Vac
50W
65W
30W
40W
UVLO
comparator
V
DD
8.4/
11.5V
overtemp
detector
R1 S
R2 FF Q
R3 R4 R5
standby
comparator
0.5V
current
amplifier
PWM
comparator
125k
4.35V
overvoltage
comparator
18V
overload
comparator
4.5V
Although the main application of VIPer53E is in
AC/DC converters for consumer equipment such
as set-top boxes, DVDs, VCRs, it can also be used
for stand-by power supplies for servers or in home
appliances where a very efficient AC/DC power
supply in buck topology is needed.
www.st.com/vipower
TOVL
COMP SOURCE
VIPer53E general block diagram
STMICROELECTRONICS
1
