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TSM007

Primary PWM Controller

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Current-mode PWM Controller

Internal Under Voltage Protection

Programmable Under Voltage

High-current Output Drive Suitable for

Power Mosfet

Programmable Soft Start

2kV ESD Protection

N

DIP-8

(Plastic Package)

DESCRIPTION

The TSM007 integrated circuit incorporates all

circuitry to implement off line or DC-DC power

supply applications using a fixed frequency

current mode control.

PIN CONNECTIONS (top view)

Based on a standard current mode PWM

controller, this device includes additional features

for higher integration.

PC SMPS

ORDER CODE

Part Number

TSM007IN

TSM007ID

TSM007IDT

o

r

P

e

(t s)

b

O

-

Temperature Range

c

u

d

0, +95¡ãC

c

u

d

o

r

P

1 Comp

Ss

8

2 Brnout

Vin

7

3 CS

Out

6

4 CT

Gnd 5

e

t

le

so

APPLICATION

¡ö

D

SO-8

(Plastic Package)

)

s

t(

Package

Packaging

DIP

SO

SO

Tube

Tube

Tape & Reel

t

e

l

o

s

b

O

June 2004

1/12

TSM007

1

Block Diagram

Block Diagram

Vin

Internal UVLO

50?A

2 Brnout

Vref

Standby

Brown_Out

Vin

Vref_Status

28V

725?A

2R

1 Comp

Comp_Cs

Cs_Latch

1V

R

3 CS

R

Q

S

!Q

R

Q

S

!Q

LEB

400?A

4 CT

ro

P

e

let

Comp_Osc

CT

so

1mA

Vref

10?A

)

s

(

ct

b

O

-

Soft start

8 SS

Css

c

u

d

Start up_Latch

Vref

u

d

o

4mA

r

P

e

t

e

l

o

s

b

O

PIN DESCRIPTION

Name

COMP

BRNOUT

CS

CT

GND

OUT

VIN

SS

2/12

Pin

Type

1

2

3

4

5

6

7

8

Analog input

Analog input

Analog input

Timing capacitor

Power supply

Analog output

Power supply

Timing capacitor

)

s

t(

Vin 7

Function

Current comparator for current mode control.

Undervoltage.

Current sense.

Sets the oscillator frequency.

Signal ground.

Totem pole output to direct drive a power MOSFET.

Supply input voltage.

Soft start.

Out 6

Gnd 5

Absolute Maximum Ratings

2

TSM007

Absolute Maximum Ratings

Symbol

Vin

Io

Iopeak

Vcomp

Isinkcomp

VBrnout

Vcs

Vct

Vout

Vss

Pt

Tstg

Tj

ESD

DC Supply Voltage

DC Supply Voltage 1

DC output current

Peak output current

COMP terminal voltage

COMP terminal sink current

Brown out terminal voltage

CS terminal voltage

CT terminal voltage

OUT terminal voltage

SS terminal voltage

Power dissipation at 25¡ãC

Storage temperature

Junction temperature

Electrostatic Discharge

Value

Unit

-0.3 to 25

V

0.1

1

-0.3 to 5.5

6

-0.3 to Vin

-0.3 to 6.3

-0.3 to 5.0

-0.3 to Vin

-0.3 to 6.4

500

-40 to 150

150

2

A

A

V

mA

V

V

V

V

V

mW

¡ãC

¡ãC

kV

1) All voltage values, except differential voltage are with respect to network ground terminal (GND).

c

u

d

OPERATING CONDITIONS

Symbol

Vcc

Toper

ro

Parameter

P

e

let

DC Supply Conditions

Operating Free Air Temperature Range

)

s

(

ct

)

s

t(

Value

Unit

12 to 25

0 to 95

V

¡ãC

o

s

b

O

-

u

d

o

r

P

e

t

e

l

o

s

b

O

3/12

TSM007

3

Electrical Characteristics

Electrical Characteristics

Tamb = 25¡ãC, Vin=12V, Ct=1.5nF unless otherwise specified

Symbol

Parameter

Test Condition

Min

Typ

Max

Unit

84

500

100

116

¡À0.5

¡À10

400

600

3.0

1.4

1.6

¡À2.0

kHz

kHz

%

%

?A

?A

V

V

V

2.58

58

Vin

Oscillator

Fosc

Foscmax

?fosc1

?fosc2

Ici

Icd

Vthct

Vtlct

?Vct

Oscillating frequency

Maximum oscillating frequency

Typical oscillating voltage stability

Typical oscillating temperature stability

Charge current

Discharge current

Upper trip point

Lower trip point

Amplitude

12V ¡Ü Vin ¡Ü 25V

0¡ãC ¡Ü Ta ¡Ü 70¡ãC

Vct=2V

Vct=2V

336

504

464

696

Brown out

Vbr

Ibr-on

Vbrin

Threshold voltage

Brown out terminal source current

Input voltage

Vbr=3V, 0¡ãC¡ÜT¡Ü 70¡ãC

2.42

42

-0.3

2.50

50

Vcomp=5V

0.5

0.725

0V ¡Ü Vcs ¡Ü 0.8V

Vcomp=5V

12V ¡Ü Vin ¡Ü 25V

Vcs=2V

2.85

0.9

c

u

d

Comp

Icomp

Source surrent

Current sense

Avcs

Vthcs

PSRR

Ibcs

Gain

Maximum sensing voltage

Power supply voltage rejection ratio

Input bias current

Leading edge blanking

LEB

Output low voltage 1

Output low voltage 2

Output high voltage 1

Output high voltage 2

Rise time

Fall time

UVLO saturation

Maximum duty cycle

(s)

t

c

u

od

r

P

e

t

e

l

o

Soft start

Iiss

dIiss

Idss

VHss

VLss

s

b

O

o

s

b

O

-

Vcs = 0 to 1 V

Vcomp = 2 V

Delay to output

Output

VOL1

VOL2

VOH1

VOH2

tr

tf

VOL3

Dmax

e

t

le

o

r

P

Source current

Temperature stability

Sink current

Clamp voltage

Low voltage

Iosink=20mA

Iosink=200mA

Iosource=20mA

Iosource=200mA

CL=1nF, 10% to 90%

CL=1nF, 90% to 10%

Vin=5V, Iosink=1mA

Vss=2V

0¡ãC ¡Ü Ta ¡Ü 70¡ãC

Vss=2V, Vbr=2V

3.00

1.0

70

0.5

)

s

t(

0.950

3.15

1.1

10

280

0.1

0.8

Vin-2.0 Vin-1.5

Vin-3.0 Vin-1.7

100

30

0.05

54

60

8

7

4

4.2

10

10

Vbr=2V

V

?A

V

?A

V

dB

?A

ns

1.5

2.2

150

60

1.1

66

12

13

0.2

V

V

V

V

ns

ns

V

%

?A

?A

mA

V

V

Internal Under Voltage Lockout (UVLO)

VH

VL

dVuvlo

UVLO top threshold

UVLO bottom threshold

UVLO hysteresis voltage

8.9

7.3

10.1

8.5

dVuvlo=VH-VL

9.5

7.9

1.6

V

V

V

CL=3.3nF, Vin=12V

Vbr ¡Ü 1V, Vin=12V

10

250

13

350

mA

?A

Total current consumption

Iin

Istby

4/12

Operating current

Supply current in standby mode

Functional Description

4

TSM007

Functional Description

TSM007: PWM Controller IC

Vref 1.4V_3.0V

Comp_osc

Internal UVLO function

400?A

The Under Voltage Lock Out function disables the

whole device when supply voltage is lower than

the threshold.

CT

Vin

CT

725?A

1mA

Vref block

Cs Latch

The Vref block provides an internal 5V reference

voltage to the IC. An internal Vref status signal is

active when Vref is lower than 4.7V and is used to

drive the output driver low when Vref is not valid.

Comp

VF

VF

CS

!Q

R

Q

Comp_Cs

Startup latch

2R

The startup latch is set when the IC exits from

standby mode or UVLO state. It is reset when the

CT capacitor is discharged for the first time.

Vcc

S

R

1V

Out

UVLO

o

r

P

Vref_Status

Out

e

t

le

Vref

c

u

d

)

s

t(

Oscillator

Vref 1.4V_3.0V

Comp_osc

CT

Startup Latch

CT

S

!Q

1mA

R

Out

o

r

P

e

o

s

b

O

-

A capacitor from the CT pin to GND sets the

oscillating frequency.

400?A

Q

c

u

d

(t s)

VCT

3V

Ici=400?A

Icd=600?A

1.4V

Tc

Out

Td

Vref

Vref

400?A

400?A

Current sense input

t

e

l

o

CT

A voltage proportional to the transformer primary

winding current is applied to the CS pin. The

control IC uses this information to perform current

mode control. The PWM function will be stopped if

the CS pin voltage is greater than 1.0V.

CT

Ici

s

b

O

Icd

1mA

CT

1mA

CT

T = Tc+Td

T = CT?Vct/Ici + CT?Vct/Icd

Let¡¯s assume F = 1/T =100KHz

==> CT = (IcixIcd) / (Fx?Vct(Ici+Icd))

==> CT = 1.5nF

5/12

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