VIP22A [ETC]

低功耗离线开关电源主开关;


型号：	VIP22A
厂家：	ETC
描述：	低功耗离线开关电源主开关开关
文件：	总15页 (文件大小：264K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

VIPer22ADIP

VIPer22AS

LOW POWER OFF LINE SMPS PRIMARY SWITCHER

TYPICAL POWER CAPABILITY

Mains type

SO-8

DIP-8

European

(195 - 265 Vac)

12 W

20 W

SO-8

DIP-8

US / Wide range

(85 - 265 Vac)

7 W

12 W

ORDER CODES

PACKAGE

TUBE

T&R

FIXED 60 KHZ SWITCHING FREQUENCY

9V TO 38V WIDE RANGE VDD VOLTAGE

CURRENT MODE CONTROL

SO-8

DIP-8

VIPer22AS

VIPer22AS13TR

VIPer22ADIP -

AUXILIARY UNDERVOLTAGE LOCKOUT

WITH HYSTERESIS

MOSFET on the same silicon chip. 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:

– Large input voltage range on the V_DDpin

accommodates changes in auxiliary supply

voltage. This feature is well adapted to battery

charger adapter configurations.

HIGH VOLTAGE START UP CURRENT

SOURCE

OVERTEMPERATURE, OVERCURRENT AND

OVERVOLTAGE PROTECTION WITH

AUTORESTART

DESCRIPTION

– Automatic burst mode in low load condition.

– Overvoltage protection in hiccup mode.

The VIPer22A combines a dedicated current mode

PWM controller with a high voltage Power

BLOCK DIAGRAM

DRAIN

ON/OFF

60kHz

OSCILLATOR

REGULATOR

PWM

LATCH

INTERNAL

SUPPLY

R2 R3 R4

OVERTEMP.

DETECTOR

VDD

BLANKING

0.23 V

8/14.5V

OVERVOLTAGE

LATCH

230

Ω

42V

1 k

Ω

SOURCE

September 2002

1/15

VIPer22ADIP / VIPer22AS

PIN FUNCTION

Name

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 monitors the

voltage and provides two thresholds:

- V

: Voltage value (typically 14.5V) at which the device starts switching and turns off the start up

DDon

current source.

- V : Voltage value (typically 8V) at which the device stops switching and turns on the start up current

DDoff

source.

SOURCE Power MOSFET source and circuit ground reference.

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

DRAIN

charging the external V capacitor.

Feedback input. The useful voltage range extends from 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.

CURRENT AND VOLTAGE CONVENTIONS

I_DD

I_D

VDD

DRAIN

I_FB

CONTROL

V_DD

V_D

SOURCE

V_FB

VIPer22A

CONNECTION DIAGRAM

DRAIN

SOURCE

DRAIN

SOURCE

VDD

SO-8

DIP8

2/15

VIPer22ADIP / VIPer22AS

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

-0.3 ... 730

-0.3 ... 400

Internally limited

0 ... 50

Unit

Switching Drain Source Voltage (T =25 ... 125°C)

(See note 1)

(See note 2)

DS(sw)

Start Up Drain Source Voltage (T =25 ... 125°C)

DS(st)

Continuous Drain Current

Supply Voltage

Feedback Current

Electrostatic Discharge:

Machine Model (R=0Ω; C=200pF)

Charged Device Model

200

1.5

ESD

Junction Operating Temperature

Case Operating Temperature

Storage Temperature

Internally limited

-40 to 150

°C

-55 to 150

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

and

DDon

remains above V

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

DDon

or has fallen below V

DDoff

THERMAL DATA

Symbol

Parameter

Max Value

Unit

Thermal Resistance Junction-Pins for :

Rthj-case SO-8

DIP-8

°C/W

Thermal Resistance Junction-Ambient for :

Rthj-amb SO-8

DIP-8

(See note 1)

Note: 1. When mounted on a standard single-sided FR4 board with 200 mm² of Cu (at least 35 µm thick) connected to all DRAIN pins.

ELECTRICAL CHARACTERISTICS (T_j=25°C, V_DD=18V, unless otherwise specified)

POWER SECTION

Symbol

Parameter

Test Conditions

I =1mA; V =2V

Min.

Typ.

Max.

Unit

Drain-Source Voltage

Off State Drain Current

730

DSS

=500V; V =2V; T=125°C

DS FB j

0.1

DSS

I =0.4A

Static Drain-Source

On State Resistance

Ω

DSon

I =0.4A; T =100°C

I =0.2A; V =300V

(See fig.1)

(See note 1)

Fall Time

100

I =0.4A; V =300V

(See fig.1)

(See note 1)

Rise Time

=25V

Drain Capacitance

oss

Note: 1. On clamped inductive load

3/15

VIPer22ADIP / VIPer22AS

ELECTRICAL CHARACTERISTICS (T_j=25°C, V_DD=18V, unless otherwise specified)

SUPPLY SECTION

Symbol

Parameter

Test Conditions

VDS=100V; V =0V ...V (See fig. 2)

DDon

Min.

Typ.

Max.

Unit

Start Up Charging

Current

-1

DDch

Start Up Charging

Current

in Thermal Shutdown

=5V; V =100V

DDoff

T > T - T

HYST

Operating Supply Current

Not Switching

=2mA

DD0

Operating Supply Current

Switching

=0.5mA; I =50mA

(Note 1)

4.5

DD1

Restart Duty Cycle

(See fig. 3)

RST

Undervoltage

(See fig. 2 & 3)

(See fig. 2)

DDoff

Shutdown Threshold

Start Up Threshold

5.8

14.5

6.5

7.2

DDon

Threshold

DDhyst

Hysteresis

Overvoltage

DDovp

Threshold

Note: 1. These test conditions obtained with a resistive load are leading to the maximum conduction time of the device.

OSCILLATOR SECTION

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Oscillator Frequency

Total Variation

... 35V; T=0 ... 100°C

kHz

OSC

DDoff

PWM COMPARATOR SECTION

Symbol

Parameter

Test Conditions

Min.

Typ.

560

0.7

Max.

Unit

to I Current Gain

(See fig. 4)

=0V

(See fig. 4)

Peak Current Limitation

I Shutdown Current

0.56

0.84

Dlim

(See fig. 4)

0.9

kΩ

FBsd

I =0mA

FB Pin Input Impedance

1.2

Current Sense Delay to

Turn-Off

I =0.4A

200

Blanking Time

500

700

Minimum Turn On Time

ONmin

OVERTEMPERATURE SECTION

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Thermal Shutdown

Temperature

(See fig. 5)

140

170

°C

Thermal Shutdown

Hysteresis

°C

HYST

4/15

VIPer22ADIP / VIPer22AS

Figure 1 : Rise and Fall Time

C << Coss

VDD

DRAIN

CONTROL

300V

90%

SOURCE

VIPer22A

10%

Figure 2 : Start Up VDD Current

DD0

DDhyst

DDon

DDoff

DDch

= 100 V

= 0 kHz

Figure 3 : Restart Duty Cycle

DDon

VDD

DRAIN

10µF

CONTROL

DDoff

100V

SOURCE

VIPer22A

= -------------------------

RST

+ t

ST CH

5/15

VIPer22ADIP / VIPer22AS

Figure 4 : Peak Drain Current vs. Feedback Current

100V

4mH

Dpeak

VDD

DRAIN

1/F

OSC

CONTROL

18V

100V

SOURCE

47nF

VIPer22A

FBsd FB

The drain current limitation is

obtained for VFB = 0 V, and a

negative current is drawn from

the FB pin. See the Application

section for further details.

Dpeak

∆I

Dpeak

= – ----------------------

Dlim

∆I

FBsd

Figure 5 : Thermal Shutdown

HYST

Automatic

start up

DDon

6/15

VIPer22ADIP / VIPer22AS

Figure 6 : Switching Frequency vs Temperature

1.01

Vdd = 10V ... 35V

0.99

0.98

0.97

-20

100

120

Temperature (°C)

Figure 7 : Current Limitation vs Temperature

1.04

1.03

1.02

1.01

0.99

0.98

0.97

0.96

0.95

0.94

Vin = 100V

Vdd = 20V

-20

100

120

Temperature (°C)

7/15

VIPer22ADIP / VIPer22AS

Figure 8 : Rectangular U-I output characteristics for battery charger

DCOUT

AC IN

ISO1

VDD

DRAIN

CONTROL

SOURCE

VIPerX2A

Vcc

Vref

C10

GND

TSM101

R10

GND

RECTANGULAR U-I OUTPUT

CHARACTERISTIC

WIDE RANGE OF V_DDVOLTAGE

The V_DDpin voltage range extends from 9V to 38V.

This feature offers a great flexibility in design to

achieve various behaviors. In figure 8 a forward

configuration has been 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 reduced

and a small ceramic chip (100 nF) is sufficient to

insure the filtering function. The total start up

time from the switch on of input voltage to output

voltage presence is dramatically decreased.

A complete regulation scheme can achieve

combined and accurate output characteristics.

Figure 8 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.

– 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_DDpin

voltage may vary as much as the input voltage,

that is to say with a ratio of about 4 for a wide

range application.

8/15

VIPer22ADIP / VIPer22AS

FEEDBACK PIN PRINCIPLE OF OPERATION

In a real application, the FB pin is driven with an

optocoupler as shown on figure 9 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 0 V.

For low drain currents, the formula (1) is valid as

long as IFB satisfies I_FB< I_FBsd, where I_FBsdis an

internal threshold of the VIPer22A. If I_FBexceeds

this threshold the device will stop switching. This is

represented on figure 4, and I_FBsdvalue is

specified in the PWM COMPARATOR SECTION.

Actually, as soon as the drain current is about 12%

of Idlim, that is to say 85 mA, the device will enter

a burst mode operation by missing switching

cycles. This is especially important when the

converter is lightly loaded.

It is then possible to build the total DC transfer

function between I_Dand I_FBas shown on figure 10.

This figure also takes into account the internal

blanking time and its 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 85 mA value, as described above.

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 9 presents the internal current

mode structure.

The Power MOSFET delivers a sense current I_s

which is proportional to the main current Id. 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

0.23 V. The MOSFET is switched off when the

following equation is reached:

R₂(I_S+ I_FB) = 0.23V

By extracting I_S:

0.23V

I_S= ------------- – I _FB

R₂

Using the current sense ratio of the MOSFET G_ID

0.23V

I_D= G_IDI_S= G_ID------------- – I _FB

R₂

The current limitation is obtained with the FB pin

shorted to ground (V_FB= 0 V). This leads to a

negative current sourced by this pin, and

expressed by:

0.23V

I_FB= – -------------

R₁

By reporting this expression in the previous one, it

is possible to obtain the drain current limitation

START UP SEQUENCE

I_Dlim

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_DDis lower than V_DDon. When

reaching V_DDon, the start up 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

I_Dlim= G_ID0.23V ----- + -----

R₂R ₁

Figure 9 : Internal Current Control Structure

DRAIN

60kHz

OSCILLATOR

+Vdd

PWM

LATCH

Figure 10 : I_FBTransfer function

Secondary

feedback

Dpeak

0.23V

I_FB

Dlim

1 kΩ

230 Ω

Part masked by the

threshold

FBsd

ONmin

SOURCE

--------------------------------------

85mA

ONmin

--------------------------------------

FBsd

9/15

VIPer22ADIP / VIPer22AS

Figure 11 : Start Up Sequence

Figure 12 : Overvoltage Sequence

V_DDon

DDovp

V_DDoff

DDon

tss

DDoff

OUT

OVERVOLTAGE THRESHOLD

An overvoltage detector on the V_DDpin allows the

VIPer22A to reset itself when V_DDexceeds

V_DDovp. This is illustrated in figure 12, which shows

the whole sequence of an overvoltage event. Note

that this event is only latched for the time needed

by V_DDto reach V_DDoff, and then the device

resumes normal operation automatically.

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 figure 11. Note that

during the real starting phase t_ss, the device

consumes some energy from the V_DDcapacitor,

waiting for the auxiliary winding to provide 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.

10/15

VIPer22ADIP / VIPer22AS

SO-8 MECHANICAL DATA

mm.

inch

DIM.

MIN.

TYP

MAX.

1.75

0.25

1.65

0.85

0.48

0.25

0.5

MIN.

TYP.

MAX.

0.068

0.009

0.064

0.033

0.018

0.010

0.019

0.1

0.003

0.65

0.35

0.19

0.25

0.025

0.013

0.007

0.010

45 (typ.)

4.8

5.8

0.188

0.228

0.196

0.244

6.2

1.27

3.81

0.050

0.150

3.8

0.4

0.14

0.157

0.050

0.023

1.27

0.6

0.015

8 (max.)

0.8

1.2

0.031

0.047

11/15

VIPer22ADIP / VIPer22AS

Plastic DIP-8 MECHANICAL DATA

mm.

TYP

DIM.

MIN.

MAX.

5.33

0.38

2.92

0.36

1.14

0.20

9.02

7.62

6.10

3.30

0.46

1.52

0.25

9.27

7.87

6.35

2.54

7.62

4.95

0.56

1.78

0.36

10.16

8.26

7.11

10.92

3.81

2.92

3.30

Package Weight

Gr. 470

P001

12/15

VIPer22ADIP / VIPer22AS

SO-8 TUBE SHIPMENT (no suffix)

Base Q.ty

Bulk Q.ty

100

2000

Tube length (± 0.5)

532

3.2

C (± 0.1)

0.6

All dimensions are in mm.

TAPE AND REEL SHIPMENT (suffix “13TR”)

REEL DIMENSIONS

Base Q.ty

Bulk Q.ty

A (max)

B (min)

C (± 0.2)

2500

330

1.5

20.2

12.4

G (+ 2 / -0)

N (min)

T (max)

18.4

All dimensions are in mm.

TAPE DIMENSIONS

According to Electronic Industries Association

(EIA) Standard 481 rev. A, Feb 1986

Tape width

P0 (± 0.1)

Tape Hole Spacing

Component Spacing

Hole Diameter

D (± 0.1/-0) 1.5

Hole Diameter

D1 (min)

F (± 0.05)

K (max)

1.5

5.5

4.5

Hole Position

Compartment Depth

Hole Spacing

P1 (± 0.1)

End

All dimensions are in mm.

Start

Top

No components

500mm min

Components

No components

cover

tape

Empty components pockets

saled with cover tape.

500mm min

User direction of feed

13/15

VIPer22ADIP / VIPer22AS

DIP-8 TUBE SHIPMENT (no suffix)

Base Q.ty

1000

532

8.4

Bulk Q.ty

Tube length (± 0.5)

11.2

0.8

C (± 0.1)

All dimensions are in mm.

14/15

VIPer22ADIP / VIPer22AS

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences

of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is

granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are

subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products

are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a trademark of STMicroelectronics

STMicroelectronics GROUP OF COMPANIES

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http://www.st.com

15/15

VIP22A [ETC]

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