TSM007
Primary PWM Controller
■
■
■
■
■
■
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°C
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
■
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
50µA
2 Brnout
Vref
Standby
Brown_Out
Vin
Vref_Status
28V
725µA
2R
1 Comp
Comp_Cs
Cs_Latch
1V
R
3 CS
R
Q
S
!Q
R
Q
S
!Q
LEB
400µA
4 CT
ro
P
e
let
Comp_Osc
CT
so
1mA
Vref
10µA
)
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°C
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
°C
°C
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
°C
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°C, Vin=12V, Ct=1.5nF unless otherwise specified
Symbol
Parameter
Test Condition
Min
Typ
Max
Unit
84
500
100
116
±0.5
±10
400
600
3.0
1.4
1.6
±2.0
kHz
kHz
%
%
µA
µA
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 ≤ Vin ≤ 25V
0°C ≤ Ta ≤ 70°C
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°C≤T≤ 70°C
2.42
42
-0.3
2.50
50
Vcomp=5V
0.5
0.725
0V ≤ Vcs ≤ 0.8V
Vcomp=5V
12V ≤ Vin ≤ 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°C ≤ Ta ≤ 70°C
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
µA
V
µA
V
dB
µA
ns
1.5
2.2
150
60
1.1
66
12
13
0.2
V
V
V
V
ns
ns
V
%
µA
µA
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 ≤ 1V, Vin=12V
10
250
13
350
mA
µA
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
400µA
The Under Voltage Lock Out function disables the
whole device when supply voltage is lower than
the threshold.
CT
Vin
CT
725µA
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.
400µA
Q
c
u
d
(t s)
VCT
3V
Ici=400µA
Icd=600µA
1.4V
Tc
Out
Td
Vref
Vref
400µA
400µA
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
TSM007
Functional Description
Soft start
Brown out
A capacitor from the SS pin to GND provides the
soft start function. The capacitor starts to charge
when VIN reaches the UVLO threshold and Vref is
good.The soft start block enables the IC to start
with a progessive PWM duty cycle. The soft start
period is set by the external capacitor Css. The
soft start comparator drives the output driver low
when the SS pin voltage is greater than the CT pin
voltage minus one VF voltage..
A voltage proportionnal to the Bulk capacitor
voltage is applied to the BRNOUT pin. When this
pin signal is less than 2.5V, the IC is disabled: SS
and CT pins go low, Vref is disabled and the IC
goes to standby mode. All bias currents are
switched off. The 2.5V voltage at the negative
input of comparator Comp_Brown out is still
active. When Brown out voltage goes higher than
2.5V, Vref is enabled again. A startup period is
started, and then a soft start occurs..
Cs_latch
CT
Comp_osc
CT
VF
R
Q
S
!Q
filtered
Vin
R1
Ibr = 50µA
Ibr
Vref
Brown out
1.4V_3.0V
Vcc
Vref
Css
Comp_SS
CT
e
t
le
so
Out
CT
VCT-VF
2.4V
Iiss=10µA
SS
0.8V
o
r
P
Vref 1.4V_3.0V
400µA
Out
)
s
t(
Vref_Status
SS
Idss
4mA
c
u
d
UVLO
R2
Iiss
10µA
Iiss
Comp_brown out
2.50V
Out
uc
d
o
r
P
e
(t s)
b
O
-
Comp_osc
Startup Latch
S
!Q
R
Q
1mA
Out
Out
Brown out
2.5V
Ibr=50µA
Tss = Soft start period
Tss = Cssx(Vthct-VF)/Iiss
t
e
l
o
Let’s assume BRNOUT acts for Vfiltered = 200V
Let’s assume Tss = 50ms
R2 = 15KΩ
==> Css = TssxIiss/(Vthct-VF)
R1 = R2(Vfiltered - UVLO) / UVLO
==> Css = 210nF
When BRNOUT is bellow 2.5V
s
b
O
IR2 = Vfiltered(R1+R2)
When BRNOUT is above 2.5V
IR2 = Ibr + Vfiltered(R1+R2)
BRNOUT = R2x(Ibr + Vfiltered(R1+R2))
R1 = 1185KΩ
R2 = 167µA
When BRNOUT is above 2.5V
IR2 = 237µA
BRNOUT = 3.55V
6/12
Functional Description
TSM007
COMP input
Output driver
This pin is connected to the current comparator
for current mode control. The pin should be
connected to the collector (primary side) of an
optocoupler which anode (secondary side) is
driven by the output of error amplifier.
The COMP input is used to set the reference level
for the current sense comparator. The current
sense threshold is set to (Vcomp - 2 * Vbe ) / 3.
The OUT totem pole output is capable to sink and
source more than 1.0A (peak) in order to direct
drive a power MOSFET..
28V
Vin
Standby consumption
Out
The low current value supply in stand by mode
reduces the consumption ..
Rb
VFiltered
Gnd
R1
Rp
Raux
c
u
d
D1
+
7
Cd
R2
2
Brnout
8
Ss
Vin
e
t
le
Out 6
TSM007 CS 3
4
CT
5
Gnd
Comp 1
Brnout
)
s
(
ct
2.5V
Out
u
d
o
r
P
e
Istby
Iin
)
s
t(
o
r
P
o
s
b
O
-
Istby
When Brnout is below 2.5V, Vflitered below 200V
t
e
l
o
the PWM is off.
==> Icc = Istby.
s
b
O
RP = (Vfiltered-Vz)/Istby
In normal mode, the Vfiltered voltage can go up to
400V.
==> Rpmax dissipation = (Vfiltered-Vin)²/Rp
The Iin current is provided by the auxiliary
winding.
Let’s assume Vfiltered = 200V
Rp = 620KΩ
Rpmax dissipation = 220mW
7/12
TSM007
Functional Description
Fig. 1: Detailed Internal Schematic
Vin
Internal UVLO
Ibr
50µA
Standby
Vref
Comp_Brown out
2
Brnout
Vin
28V
2.5V
Vref_Status
Icomp
725µA
2R
1
Comp_Cs
Cs_Latch
Comp
1V
R
R
Q
S
!Q
Vin
3 CSVref
Start up_Latch
R
Q
S
!Q
c
u
d
LEB
Ici
400µA
4
CT
Comp_Ocs
CT
Icd
1mA
e
t
le
3 - 1.4V
Vref
Comp_SS
Iiss
10µA
)
s
(
ct
8 SS
Css
Idss
4mA
r
P
e
u
d
o
t
e
l
o
s
b
O
8/12
o
s
b
O
-
o
r
P
)
s
t(
Out
7
6
Rb
Gnd 5
Functional Description
TSM007
Timing for PWM function
Timing for Soft Start function
CT
CT
(COMP-2VF)/3
Comp
CT-VF
CS
SS
OUT
Out
Timing at Vref rise up and shut down
9.5V
VH
VL
7.9V
2V
Internal UVLO
)
s
(
ct
VrefStatus
u
d
o
CT
r
P
e
t
e
l
o
OUT
P
e
let
7.9V
2V
o
s
b
O
Brnout
4.7V
Startup
ro
9.5V
Internal UVLO
Vref
s
b
O
c
u
d
Vin
Vin
VH
VL
)
s
t(
Timing at UVLO rise up and shut down
3V
1.4V
2.5V
Vref
4.7V
VrefStatus
CT
3V
1.4V
Startup
OUT
9/12
TSM007
Functional Description
Fig. 2: Application schematic
Vfiltered
R7
C6
F1
T1
R4
L1
C1
D1
C5 +
Vout+
L2
D2
Rp
C3
R5
+ C9
D5
C4
+ C10
Gnd
D3
Raux
R6
+ C7
D4
R1
R12
R13
R14
Q1
7
C2
Css
Vin
2
Brnout
8
Ss
Out 6
4
CS
U1
CT TSM007
5
Gnd
3
U2
R8
R9
R16
Comp 1
U3
TL431
Ct
R11
d
o
r
P
e
let
)
s
(
ct
u
d
o
r
P
e
t
e
l
o
s
b
O
10/12
o
s
b
O
-
uc
R10
C8
R2
)
s
t(
C11
R15
Package Mechanical Data
5
TSM007
Package Mechanical Data
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
3.3
a1
0.7
B
1.39
B1
0.91
MAX.
0.130
0.028
b
1.65
0.055
1.04
0.036
0.5
b1
TYP.
0.38
0.041
0.020
0.5
D
0.065
0.015
0.020
9.8
0.386
E
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
I
4.8
L
e
t
le
3.3
Z
0.44
1.6
)
s
(
ct
o
s
b
O
-
0.017
o
r
P
c
u
d
)
s
t(
0.280
0.189
0.130
0.063
u
d
o
r
P
e
t
e
l
o
s
b
O
P001F
11/12
TSM007
Package Mechanical Data
SO-8 MECHANICAL DATA
mm.
DIM.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
c
u
d
8˚ (max.)
ddd
0.1
0.04
e
t
le
)
s
(
ct
)
s
t(
o
r
P
o
s
b
O
-
u
d
o
r
P
e
t
e
l
o
0016023/C
s
b
O
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 result 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 registered trademark of STMicroelectronics
All other names are the property of their respective owners
© 2004 STMicroelectronics - All Rights Reserved
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12/12
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