Datasheet VIPer12ADIP - E, VIPer12AS - E Datasheet (ST)

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Low Power OFF-Line SMPS Primary Switcher

Features

■ Fixed 60kHZ Switching Frequency

■ 9V to 38V Wide Range V

■ Current Mode Control

■ Auxiliary Undervoltage Lockout with Hysteresis

■ High Voltage Start-up Current Source

■ Overtemperature, Overcurrent and

Overvoltage Protection with Auto-Restart

■ Typical power capability

– European (195 - 265 Vac) 8W for SO-8,

13W for DIP-8

– European (85 - 265 Vac) 5W for SO-8,

8W for DIP- 8

Description

The VIPer12A combines a dedicated current
mode PWM controller with a high voltage Power
MOSFET on the same silicon chip.

Block diagram

Voltage

DD

VIPer12ADIP - E

VIPer12AS - E

DIP-8SO-8

Typical applications cover off line power supplies
for battery charger adapters, standby power
supplies for TV or monitors, auxiliary supplies for
motor control, etc.
The internal control circuit offers the following
benefits:

– L arge input voltage range on the V

accommodates changes in auxiliary supply
voltage. This feature is well adapted to

battery charger adapter configurations.
– Automatic burst mode in low load condition.
– Overvoltage protection in HICCUP mode.

DD

pin

DRAIN

VDD

FB

REGULATOR

8/14.5V

42V

INTERNAL

SUPPLY

_

+

+
_

ON/OFF

OVERTEMP.

DETECTOR

R

FF

S

OVERVOLTAGE

Q

LATCH

60kHz

OSCILLATOR

S

FF

R1

R2

R4QR3

PWM

LATCH

BLANKING

+
_

0.23 V

Ω

230

Ω

1 k

SOURCE

January 2006 DocRev1 1/21

www.st.com

21

Contents VIPer12ADIP/ AS - E

Contents

1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Pin connections and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Rectangular U-I Output characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Wide range of VDD voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Feedback pin principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Startup sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8 Overvoltage threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

9 Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

11 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2/21 DocRev1

VIPer12ADIP/ AS - E Electrical data

1 Electrical data

1.1 Maximum rating

Stressing the device above the rating listed in the “Absolute Maximum Ratings” table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the Operating sections of
this specification is not implied. Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.

Table 1. Absolute maximum rating

Symbol Parameter Value Unit

V

Switching drain source voltage (TJ = 25 ... 125°C) Note 1 -0.3 ... 730 V

DS(sw)

V

St art-up drain source voltage (TJ = 25 ... 125°C) Note 2 -0.3 ... 400 V

DS(st)

I

Continuous drain current Internally limited A

D

V

Supply voltag e 0 ... 50 V

DD

I

Feedback current 3 mA

FB

Electrostatic discharge:

V

Machine model (R = 0Ω; C = 200pF)

ESD

Charged device model

200

1.5

V

kV

T

Junction operating temperat ure Internally limited °C

J

T

Case operating temperature -40 to 150 °C

C

T

Storage Temperature -55 to 150 °C

stg

Note: 1 This parameter applies when the start-up current source is OFF. This is the case when the

V

voltage has reached V

DD

and remains above V

DDon

DDoff

.

2 This parameter applies when the start up current source is on. This is the case when the

V

voltage has not yet reached V

DD

or has fallen below V

DDon

DDoff

.

1.2 Thermal data

Table 2. Thermal data

Symbol Parameter SO-8 DIP-8 Unit

R

thJC

R

thJA Thermal Resistance Ambient-case

1. When mounted on a standard single-sided FR4 board with 200 mm2 of Cu (at least 35 µm thick)
connec te d to all DRAIN pin s.

Thermal Resistance Junction- case Max 25 15 °C/W

(1)

Max 5 5 45 °C/W

DocRev1 3/21

Electrical characteristics VIPer12ADIP/ AS - E

2 Electrical characteristics

TJ = 25°C, V

= 18V, unless otherwise specified

DD

Table 3. Power section

Symbol Parameter Test conditions Min. Typ. Max. Unit

BV

Drain-source voltage ID = 1mA; V

DSS

I

DSS

r

DS(on)

C

OFF State drain
current

Static drain-source
ON state resistance

t

Fall time

f

Rise time

t

r

Drain capacitance V

OSS

Note: 1 On clamped inductive load

Table 4. Supply section

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

DDch

I

DDoff

St art-up charging
current

St art-up charging
current in thermal
shutdown

= 2V 730 V

FB

= 500V; V

V

DS

T

= 125°C

J

= 0.2A ID = 0.2A;

I

D

T

= 100°C

J

= 0.1A; V

I

D

Note 1 (See Figure 8 on page 13)

= 0.2A; V

I

D

Note 1 (See Figure 8 on page 13)

= 25V 40 pF

DS

V

= 100V; V

DS

(See Figure 9 on page 13)

V

= 5V; VDS = 100V

DD

T

> TSD - T

J

FB

= 300V

IN

= 300V

IN

DD

HYST

= 2V;

= 5V ...V

DDon

0.1 mA

27

100 ns

50 ns

-1 mA

0 mA

30
54

Ω

Operating supply

I

DD0

I

DD1

D

V

DDoff

V

DDon

V

DDhyst

V

DDovp

current not switching
Operating supply

current switching

Restart duty-cycle (See Figure 10 on page 13) 16 %

RST

Undervoltage

V

DD

shutdown threshold

Start-up

V

DD

threshold

Threshold

V

DD

hysteresis

Overvoltage

V

DD

threshold

I

= 2mA 3 5 mA

FB

= 0.5mA; ID = 50mA

I

FB

Note2

(See Figure 9,

Figure 10 on page 13)

(See Figure 9,

Figure 10 on page 13))

(See Figure 9 on page 13) 5.8 6.5 7.2 V

2 These test conditions obtained with a resistive load are leading to the maximum conduction

time of the device.

4/21 DocRev1

4.5 mA

7 8 9 V

13 14.5 16 V

38 42 46 V

VIPer12ADIP/ AS - E Electrical characteristics

Table 5. Oscillation section

Symbol Parameter Test conditions Min. Typ. Max. Unit

F

Oscillato r fr equency

OSC

total var iat ion

V

= V

DD

T

DDoff

= 0 ... 100°C

J

... 35V;

54 60 66 kHz

Table 6. PWM Comparator section

Symbol Parameter Test Conditions Min. Typ. Max. Unit

G

I

ID

I

Dlim

I

FBsd

R

FB

t

d

t

Blanking time 500 ns

b

t

ONmin

to ID current gain (See Figure 11 on page 14) 320

FB

Peak current
limitation

I

Shutdown current (See Figure 11 on page 14) 0.9 mA

FB

FB Pin input
impedance

Current sense del ay
to turn-OFF

Minimum Turn-ON
time

= 0V

V

FB

(See Figure 11 on page 14)

= 0mA

I

D

(See Figure 11 on page 14)

I

= 0.2A 200 ns

D

0.32 0.4 0.48 A

1.2 kΩ

700 ns

Table 7. Overtemperature section

Symbol Parameter Test Conditions Min. Typ. Max. Unit

T

SD

T

HYST

temperature
Thermal shutdown

hysteresis

(See Figure 12 on page 14) 140 170 °C

(See Figure 12 on page 14) 40 °C

Thermal shutdown

Table 8. Typical Power Capability

Mains type SO-8 DIP-8

European (195 - 265 Vac) 8W 13W

US / Wide range (85 - 265 Vac) 5W 8W

DocRev1 5/21

Pin connections and function VIPer12ADIP/ AS - E

3 Pin connections and function

Figure 1. Pin connection

SOURCE
SOURCE

FB

VDD

1

2

3

4

8

7

6

5

DRAIN
DRAIN
DRAIN
DRAIN

SO-8 DIP-8

Figure 2. Current and voltage conventions

I

DD

I

FB

V

DD

V

FB

VDD DRA IN

FB

VIPer12A

CONTROL

SOURCE
SOURCE

SOURCE

FB

VDD

1

2

3

4

I

D

V

D

8

DRAIN

7

DRAIN

6

DRAIN

5

DRAIN

Table 9. Pin fu nc ti on

Pin Name Pin Function

Power supply of the control circuits. Also provides a charging current during start up
thanks to a high voltage current source connected to the drain. For this purpose, an
hysteresis comparator monitor s the V

V

DD

SOURCE Power MOSFET source and circuit gr ound reference.

DRAIN

FB

6/21 DocRev1

: V oltage value (typically 14.5V) at which the device starts swit ching and turns

- V

DDon

off the start up current source.

- V

: Voltage value (typi cally 8V) at which the device st ops switching and turn s on

DDoff

the start up current source.

Power MOSFET drain. Also used by the internal high voltage current source during
start up phase for charging the external V

Feedback input. The useful volt age ran ge ex tends f rom 0V to 1V, and defines the peak
drain MOSFET current. The current limitation, which corresponds to the maximum
drain current, is obtained for a FB pin shorted to the SOURCE pin.

voltage and provides two thresholds:

DD

capacitor.

DD

VIPer12ADIP/ AS - E Rectangular U-I Output characteristics

4 Rectangular U-I Output characteristics

Figure 3. Rectangular U-I output characteristics for battery charger

A complete regulation scheme can achieve combined and accurate output characteristics.

Figure 3. presents a secondary feedback through an optocoupler driven by a TSM101. This

device offers two operational amplifiers and a voltage reference, thus allowing the regulation
of both output voltage and current. An integrated OR function performs the combination of
the two resulting error signals, leading to a dual voltage and current limitation, known as a
rectangular output characteristic. This type of power supply is especially useful for battery
chargers where the output is mainly used in current mode, in order to deliver a defined
charging rate. The accurate voltage regulation is also convenient for Li-ion batteries which
require both modes of operation.

DocRev1 7/21

Wide range of VDD voltage VIPer12ADIP/ AS - E

5 Wide range of VDD voltage

The VDD pin voltage range extends from 9V to 38V. This feature offers a great flexibility in
design to achieve various behaviors. In
chosen to supply the device with two benefits:

■ As soon as the device starts switching, it immediately receives some energy from the

auxiliary winding. C5 can be therefore reduc ed and a smal l ceramic c hip (100nF) is
sufficient to insure the filtering function. The total s tart up time from the switch on of input
voltage to output voltage presence is dramatically decreased.

■ The output current characteristic can be maintained even with very low or zero output

voltage. Since the TSM101 is also supplied in forward mode, it keeps the current
regulation up whatever the output voltage is.The V
the input voltage, that is to say with a ratio of about 4 for a wide range application.

Figure 3 on page 7 a forward configuration has been

pin voltage may vary as much as

DD

8/21 DocRev1

VIPer12ADIP/ AS - E Feedback pin principle of operation

0.23V

6 Feedback pin principle of operation

A feedback pin controls the operation of the device. Unlike conventional PWM control
circuits which use a voltage input (the inverted input of an operational amplifier), the FB pin
is sensitive to current. Figure 4. presents the internal current mode structure.

Figure 4. Internal current contro l structure

The Power MOSFET delivers a sense current I

which is proportional to the main current Id.

s

R2 receives this current and the current coming from the FB pin. The voltage across R2 is
then compared to a fixed reference voltage of about 0.23V. The MOSFET is switched off
when the following equation is reached:

R2ISIFB+()⋅ 0.23V=

By extracting I

Using the current sense ratio of the MOSFET G

:

S

--------------- - IFB–=

I

S

R

2

:

ID

0.23V

GIDIS⋅ G

I

D

DocRev1 9/21

⎛⎞

--------------- - IFB–

⋅==

ID

⎝⎠

R

2

Feedback pin principle of operation VIPer12ADIP/ AS - E

The current limitation is obtained with the FB pin shorted to ground (VFB = 0V). This leads to
a negative current sourced by this pin, and expressed by:

FB

0.23V

--------------- -–=

R

1

I

By reporting this expression in the previous one, it is possible to obtain the drain current
limitation I

Dlim

:

1

1

I

Dlim

GID0.23V

⋅⋅=

⎛⎞

------ -

------ -+

⎝⎠

R

R

2

1

In a real application, the FB pin is driven with an optocoupler as shown on Figure 4. which
acts as a pull up. So, it is not possible to really short this pin to ground and the above drain
current value is not achievable. Nevertheless, the capacitor C is averaging the voltage on
the FB pin, and when the optocoupler is off (start up or short circuit), it can be assumed that
the corresponding voltage is very close to 0V.

For low drain currents, the formula (1) is valid as long as IFB satisfies I
I

is an internal threshold of the VIPer12A. If IFB exceeds this threshold the device will

FBsd

stop switching. This is represented on

Figure 11 on page14, and I

FBsd

< I

FBsd

, where

FB

value is specified in the
PWM COMPARATOR S EC TION. Actually, as soon as the drain current is about 12% of
Idlim, that is to say 50 mA, the device will enter a burst mode operation by missing switching
cycles. This is especially important when the converter is lightly loaded.

Figure 5. I

It is then possible to build the total DC transfer function between I

Figure 5 on page 10. This figure also takes into account the internal blanking time and its

Transfer function

FB

and IFB as shown on

D

associated minimum turn on time. This imposes a minimum drain current under which the
device is no more able to control it in a linear way. This drain current depends on the primary
inductance value of the transformer and the input voltage. Two cases may occur, depending
on the value of this current versus the fixed 50mA value, as described above.

10/21 DocRev1

VIPer12ADIP/ AS - E Startup sequence

7 Startup sequence

Figure 6. Startup sequence

This device includes a high voltage start up current source connected on the drain of the
device. As soon as a voltage is applied on the input of the converter, this start up current
source is activated as long as V

is lower than V

DD

. When reaching V

DDon

, the start up

DDon

current source is switched off and the device begins to operate by turning on and off its main
power MOSFET. As the FB pin does not receive any current from the optocoupler, the
device operates at full current capacity and the output voltage rises until reaching the
regulation point where the secondary loop begins to send a current in the optocoupler. At
this point, the converter enters a regulated operation where the FB pin receives the amount
of current needed to deliver the right power on secondary side.

This sequence is shown in
consumes some energy from the V

Figure 6. Note that during the real starting phase t

capacitor, waiting for the auxiliary winding to provide

DD

, the device

ss

a continuous supply. If the value of this capacitor is too low , the start up phase is terminated
before receiving any energy from the auxiliary winding and the converter never starts up.
This is illustrated also in the same figure in dashed lines.

DocRev1 11/21

Overvoltage threshold VIPer12ADIP/ AS - E

8 Overvoltage threshold

An overvoltage detector on the VDD pin allows the VIPer12A to reset itself when VDD
exceeds V
overvoltage event. Note that this event is only latched for the time needed by V
V

, and then the device resumes normal operation automatically.

DDoff

Figure 7. Overvoltage Sequence

. This is illus tra t ed in Figure 7., which shows the whole sequence of an

DDovp

V

DD

V

DDovp

V

DDon

V

DDoff

t

to reach

DD

V

DS

t

12/21 DocRev1

VIPer12A D I P / AS - E Operat io n pi ct ures

9 Operation pictures

Figure 8. Rise and Fall time

Figure 9. Start-up V

Figure 10. Restart duty-cycle

DD

current

DocRev1 13/21

Operation pictures VIPer12ADIP/ AS - E

Figure 11. Peak drain current Vs. feedback current

Figure 12. Thermal shutdown

14/21 DocRev1

VIPer12A D I P / AS - E Operat io n pi ct ures

Figure 13. Switching frequency Vs. temperature

Figure 14. Current Limitation vs. Temperature

DocRev1 15/21

Mechanical Data VIPer12ADIP/ AS - E

10 Mechanical Data

In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.

16/21 DocRev1

VIPer12ADIP/ AS - E Mechanical Data

Table 10. DIP8 Mechanical Data

Dimensions

Databook (mm)

Ref.

Nom. Min Max

A 5.33
A1 0.38
A2 2.92 3.30 4.95

b 0.36 0.46 0.56

b2 1.14 1.52 1.78

c 0.20 0.25 0.36
D 9.02 9.27 10.16
E 7.62 7.87 8.26

E1 6.10 6.35 7.11

e2.54

eA 7.62
eB 10.92

L 2.92 3.30 3.81

Package Weigh t Gr. 470

Figure 15. Package Dimensions

DocRev1 17/21

Mechanical Data VIPer12ADIP/ AS - E

Table 11. SO8 Mechanical Data

Dimensions

Databook (mm)

Ref.

Nom. Min Max

A 1.35 1.75

A1 0.10 0.25

A2 1.10 1.65

B 0.33 0.51
C 0.19 0.25
D 4.80 5.00
E 3.80 4.00
e 1.27
H 5.80 6.20
h 0.25 0.50
L 0.40 1.27

k 8° (max.)

ddd 0.1

Figure 16. Package Dimensions

18/21 DocRev1

VIPer12ADIP/ AS - E Order codes

11 Order codes

Table 12. Order codes

Part Number Package Shipment

VIPER12ASTR-E SO-8 Tape and Reel

VIPer12AS - E SO-8 Tube

VIPer12ADIP - E DIP-8 Tube

DocRev1 19/21

Revision history VIPer12ADIP/ AS - E

12 Revision history

Table 13. Document revision history

Date Revision Changes

09-Jan-2006 1 Initial relea s e.

20/21 DocRev1

VIPer12ADIP/ AS - E Revision history

I

s

o

d

b

t

t

t

nformation furnished is believed to be accurate and reliable. However, STMicroelectronic s assumes no responsibilit y for the consequence

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DocRev1 21/21