ST EVALVIPER17L-7W User Manual

Demonstration board on 7 W single output

Features

■ Current mode with user set drain current

limitation

■ Frequency jittering

■ EMI regulation compliant

■ Low stand by consumption

■ High efficiency conversion

■ Over-load / output short circuit protection

■ Transformer saturation and secondary winding

short circuit protection (2

■ Output over-voltage protection (optional)

■ Brown out protection (optional)

Description

The new VIPer17 device integrates in the same
package two components: an advanced PWM
controller built in BCD6 technology and an 800 V
avalanche rugged vertical power MOSFET. The
device is suitable for off line power converter
operating both, with wide range input voltage (85
VAC - 270 VAC) up to 7 W or with single range
input voltage (85 VAC - 132 VAC or 175 VAC - 265
VAC). With European range input voltage (175
VAC - 265 VAC) the device can handle up to 10 W
of output power. The proposed solution has the
advantage of using few external components
compared to a discrete solution, providing several
switch mode power supply's protections and very
low stand by consumption in no load condition.

nd

OCP)

EVALVIPER17L-7W

based on the VIPer17

Data Brief

EVALVIPER17L-7W

brown out protections, improve the reliability and
safety of the design. More over internal thermal
shut down and an 800 V avalanche rugged power
MOSFET improve the robustness of the system.

The present demonstration board is a standard
one output isolated fly-back converter that uses
all the protections above mentioned. If not
necessary brown out protection and over-voltage
protection could be not used reducing the number
of external comp furthermore.

VIPer17 device operates at fixed frequency that
can be 115 kHz or 60 kHz according to the part
number selected. Frequency jittering is
implemented and it helps to meet the standards
regarding electromagnetic disturbance The
several protections present on the device like:
overload, output short circuit, secondary winding
short, hard transformer saturation protection and

June 2008 Rev 1 1/6

For further information contact your local STMicroelectronics sales office.

www.st.com

6

Board parameter and circuit schematic EVALVIPER17L-7W

1 Board parameter and circuit schematic

Table 1. Demonstration board parameters

Parameter Symbol Value

Input voltage range V

Output voltage V

Max output current I

Precision of output regulation ∆V

High frequency output voltage ripple ∆V

Figure 1. EVALVIPER17L-7W schematic

IN

OUT

OUT

OUT_LF

OUT_HF

90V

RMS

600mA

– 265V

12V

±5%

50mV

RMS

2/6