SGS Thomson Microelectronics VB409SP, VB409 Datasheet

TYPE I

VB409
VB409SP



HIGH VOLTAGE REGULATOR POWER I.C.

CL(in)

0.8 A 70 mA 5V ± 5%

I

CL(out)

V

VB409

/ VB409SP

PRELIMINARY DATA

OUT

■ NO HIGH VOLTAGE EXTERNAL CAPACITOR

■ 5 V DC REGULATED OUTPUT VOLTAGE

■ OUTPUT CURRENT LIMITED TO 70 mA

■ THERMAL SHUT-DOWN PROTECTION

■ INPUT OVERCURRENT PROTECTION

■ POWER DISSIPATION INTERNALLY LIMITED

DESCRIPTION

The VB409 VB409SP are fully protected positive
voltage regulator designed in STMicroelectronics
High Voltage VIPower

 technology. The devices

can be connected directly to the rectified mains
(110V/230V). The devices are well suited for
applications powered from the AC mains and
requiring a 5V DC regulated output voltage
without galvanic insulation. VB409, VB409SP
provides up to 70 mA output current (internally
limited) at 5V. The included over current and

BLOCK DIAGRAM

INPUT

10

PENTAWATT HV(022Y)

PowerSO-10

ORDER CODES:

PENTAWATT HV(022Y) VB409
PowerSO-10 VB409SP

thermal shutdown provide protection for the
device.

Cap

Input current
limiter

Threshold

1

Vref1

OUTPUT

GND

Vref2

Vref3

Thermal
protection

Output current

limiter

April 2000 1/9

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VB409 / VB409SP

ABSOLUTE MAXIMUM RATING

Symbol Parameter Value Unit

∆V

IN,OUT

I

OUT

P

TOT

I

IN

T

j

T

STG

THERMAL DATA

Symbol Parameter

R

thj-amb

R

thj-case

CONNECTION DIAGRAM (TOP VIEW)

Input to output voltage - 0.2 to 420 V
Output current Internally limited mA
Power dissipation at TC=25°C Internally limited W
Input current Internally limited mA
Junction operatingtemperature - 40 to 125 °C
Storage temperature - 55 to 150 °C

Value Unit

PENTAWATT POWERSO-10 Unit

Thermal resistance junction-ambient (MAX) 60 50 °C/W
Thermal resistance junction-case (MAX) 1.1 °C/W

CAPACITOR
THRESHOLD

N.C.
GROUND
OUTPUT

6
7

8
9

10

11

INPUT

POWERSO-10

5
4
3

2
1

ELECTRICAL CHARACTERISTICS (V

V

=5V; -25ºC<Tj<125ºC) (unless otherwise specified)

OUT

N.C.
N.C.
N.C.
N.C.
N.C.

=230Vr.m.s.; 50Hz; C1=100µF; V1=50V (See Fig. 2); I

IN

5
4
3
2
1

PC10000

PENTAWATT HV(022Y)

OUTPUT
GROUND

INPUT
THRESHOLD
CAPACITOR

Symbol Parameter Test Conditions Min Typ Max Unit

V

IN(ac)

BV

IN-GND

f

IN

V

OUT

∆V

/∆V

OUT

∆V

/∆I

OUT

I

CL(out)

T

jsh

∆T

jsh

I

d

V

d

I

CL(in)

/∆T

∆V

cap

V

cap(max)

V

ref1

I

th

Input voltage a.c. 15 230 Vr.m.s.
Breakdown voltage

input-ground in off state

650 V

Input frequency 0 1 kHz
Output voltage 4.75 5 5.25 V
Cap regulation V

cap

Load regulation I

OUT

=8 to 12V; VIN=0V; Tj=25°C 7 mV/V

cap

=1 to 40mA; V

OUT

=10V; Tj=25°C 500 µV/mA

cap

Output current limit Tj=25°C7090mA
Junction temperature

shutdown limit
Junction temperature

shutdown hysteresis
Quiescent current Tj=25°C; I
Dropout voltage
(V

to V

OUT

)

cap

T

=25°C3V

j

=0A 2 mA

OUT

140 150 °C

35 °C

Input clamp current 0.8 2 A
Drift of capacitor pin
voltage in temperature
Max clamped voltage

on cap pin
Reference threshold

Voltage

12 14.5 V

10 10.5 11 V

-15 mV/°C

Current onthreshold pin 100 µA

OUT

=25mA;

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VB409 / VB409SP

OPERATION DESCRIPTION

The VB409, VB409SP contain two separate
stages, as shown in the block diagram. The first
stage is a preregulator that translates the high
rectified mains voltage to a low voltage and
charges an external electrolytic capacitor. The
second stage is a simple 5V regulator. The typical
operating waveforms are shown in Figure 2. The
device may be driven by a half wave (110 or 230
Vr.m.s.) or by a full wave using a bridge rectifier.
Current flow through the preregulator stage is
provided by the trilinton only during a conduction
angle, at both the start and the end of each half
cycle. This angle is set by adjusting the external
resistor divider (R1 and R2), in order to set the
time t
reaches the internal threshold V

at which voltage at the threshold pin

1

(see Figure

ref1

2a). When the threshold pin voltage gets over
V

, the series trilinton is switched off and

ref1

remains off until voltage at the threshold pin again
drops below the internal threshold. Using this
technique, energy is drawn from the AC mains
only during the low voltage portions of each
positive halfcycle, thus reducing the dissipation in
the first stage. During the conduction angle,
current provided by the trilinton is used to supply
the load and to charge the capacitor C1. In such a
way, when the trilinton switches off, the load
receives the required current by the capacitor
discharge. For this reason it is important to set
properly the conduction angle: during this period
C1 has to reach a sufficient charge to guarantee
that, at the end of discharging, the voltage drop

between the capacitor and the output pin is over
2V. Assuming that conduction angle has been set,
two different possibilities can occur:

1) C1 value is such to reach V

cap(max)

within the
conduction angle. As the comparator also
senses C1 voltage, when V

gets over V

cap

ref1

the trilinton would switch off. But doing this, the
capacitor would discharge through the load so
reducing its voltage. As soon as V
below V

, the trilinton switches on. As

ref1

cap

drops

consequence the trilinton reaches a stable
condition limiting the current to a value
sufficient to supply the load and hold the
capacitor voltage just below V

cap(max)

(see

figures 2b and 2c).

2) C1 value is such to reach V

cap(max)

outside the
conduction angle. In this case the trilinton
doesn’t reduce the current, but hold it to a
constant value (I

) during the whole

CL(in)

conduction angle (see figures3a and 3b).

As there are two conduction angles for each half
cycle, the capacitor isrecharged twice during each
period. In such a way the capacitor voltage has a
small ripple and, consequently, it needs a small
current to regenerate its charge. The device has
integrated current limit and thermal shutdown
protections. The thermal shutdown turns the low
voltage stage off,if the die temperature exceeds a
predetermined value. Hysteresis in the thermal
sense circuit holds the device off until the die
temperature cools down.

,

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