TS494
Voltage Mode PWM Controller
SOP-16
DIP-16
Supply Voltage Range 7 V to 40V
Output Driving Current 200mA
Oscillator Frequency up to 200KHz
General Description
The TS494 incorporates on a single monolithic chip all the functions required in the construction of a
pulse-width-modulation control circuit. Designed primarily for power supply control, these devices offer the systems
engineer the flexibility to tailor the power supply control circuitry to his application.
The TS494 contains an error amplifier, an on-chip adjustable oscillator, a deed-time control comparator, pulse-steering
control flip-flop, a 5-volt, 5% precision regulator, and output-control circuits. The error amplifier exhibits a
common-mode voltage from –0.3V to Vcc –2V. The dead-time control comparator has a fixed offset that provides
approximately 5% dead time when externally altered. The on-chip oscillatory be bypassed by terminating R
T
(pin 6) to
the reference output and providing a sawtooth input to C
T
(pin 5), or it may be used to drive the common circuits in
synchronous multiple-rail power supplies. The uncommitted output transistor provide either common-emitter or
emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be
selected through the output-control function. The architecture of these devices prohibits the possibility of either output
being pulsed twice during push-pull operation.
The TS494 is offered in SOP-16 and DIP-16 package.
Features
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200mA Sink or Source
Current
Output Control Selects Single-Ended or Push –Pull
Operation
Internal Circuitry Prohibits Double Pulse at Either
Output
Variable Dead-Time Provides Control over Total
Range
Internal Regulator Provides a Stable 5-V Reference
Supply with 5% Tolerance
Circuit Architecture Allows Easy Synchronization
Pin Assignment
Applications
Charger
DC to DC converters
Ordering Information
Part No.
TS494CD
TS494CS
Operating Temp.
0 ~ +70
o
C
Package
DIP-16
SOP-16
TS494
1-7
2003/12 rev. A
Function Block Diagram
Absolute Maximum Rating
Rating
Power Supply Voltage
Collector Output Voltage
Collector Output Current (each transistor)
Amplifier Input Voltage Range
Power Dissipation @ Ta<=45 C
Thermal Resistance, Junction to Ambient
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
Derating Ambient Temperature
o
Symbol
Vcc
Vc1, Vc2
Ic1, Ic2
V
IR
Pd
R
θJA
Tj
Tstg
Ta
Ta
Value
40
40
250
- 30 ~ +40
1
80
125
-55 ~ +125
0 ~ +70
45
Unit
V
V
mA
V
W
o
C/W
o
o
o
o
C
C
C
C
Recommended Operating Conditions
Rating
Power Supply Voltage
Collector Output Voltage
Collector Output Current (each transistor)
Amplifier Input Voltage
Current Into Feedback Terminal
Reference Output Current
Timing Resistor
Timing Capacitor
Oscillator Frequency
Symbol
Vcc
Vc1, Vc2
Ic1, Ic2
Vin
Ifb
Iref
R
T
C
T
Fosc
Min.
7
--
--
- 0.3
--
--
1.8
0.0047
1
Typ.
15
30
--
--
--
--
30
0.001
40
Max
40
40
200
Vcc-2.0
0.3
10
500
10
200
Unit
V
V
mA
V
mA
mA
KΩ
uF
KHz
TS494
2-7
2003/12 rev. A
Electrical Characteristics
(Ta=25
o
C, V
CC
= 15V, C
T
= 0.01uF, R
T
= 12kΩ; unless otherwise specified.)
REFERENCE SECTION
Parameter
Output voltage (Vref)
Line regulation
Load regulation
Output voltage change with temp.
Short-circuit output current***
OSCILLATOR SECTION
Frequency
Standard deviation of frequency****
Frequency change with voltage
Frequency change with temperature***
C
T
= 0.001µF, R
T
= 30KΩ
C
T
= 0.001µF, R
T
= 30KΩ
Vcc= 7V to 40V
C
T
= 0.001µF, R
T
= 30KΩ
∆Ta=
Min to Max
ERROR AMPLIFIER SECTION
Input offset voltage
Input offset current
Input bias current
Common-mode input voltage range
Open-loop voltage amplification
Unity-gain bandwidth
Common-mode rejection ratio
Power Supply Rejection Ratio
Output sink current (pin 3)
Output source current (pin 3)
Vo= (pin 3)= 2.5V
Vo= (pin 3)= 2.5V
Vo= (pin 3)= 2.5V
Vcc= 7V to 40V
∆Vo=
3V, R
L
=2KΩ,
Vo= 0.5 to 3.5V
R
L
= 2KΩ, Vo= 0.5 to 3.5V
∆Vo=
40V
∆Vcc=
33V, Vo= 2.5V,
R
L
= 2KΩ
V
ID
= -15mV to -5V,
V(pin3)= 0.7V
V
ID
= 15mV to 5V,
V(pin3)= 3.5V
OUTPUT SECTION
Collector off-state current
Emitter off-state current
Collector-emitter
saturation voltage
Common-emitter
Emitter-follower
V
CE
= 40V, V
CC
= 40V
Vcc= 40V, V
E
= 0
V
E
= 0, Ic= 200mA
Vc= 15V, I
E
= -200mA
V
I
= Vref
V
I
= 0 to 5.25V
Vi(pin 4)= 0, C
T
= 0.1µF,
R
T
= 12KΩ
Input threshold voltage(pin 4)
Zero duty cycle
Maximum duty cycle
--
0
3.0
--
3.3
--
V
--
--
--
--
--
2.0
--
1.1
1.5
--
100
-100
1.3
2.5
3.5
mA
µA
%
V
µA
2.0
-4.0
--
mA
0.3
0.7
--
mA
--
65
--
800
90
100
--
--
--
KHz
dB
dB
70
--
--
--
2.0
5.0
-0.1
-0.3 toV
cc
-2
95
--
10
250
-1.0
mV
nA
µA
V
dB
--
--
--
--
40
3.0
0.1
--
--
--
--
12
%
KHz
Test Conditions*
Io=1mA
Vcc= 7V to 40V
Io= 1mA to 10mA
∆Ta=Min
to Max
Vref= 0
Min
4.75
--
--
--
15
Typ
5
2.0
3.0
0.2
35
Max
5.25
25
15
1
75
Unit
V
mV
%
mA
Output control input current
DEAD-TIME CONTROL SECTION
Input bias current (pin 4)
Maximum duty cycle, each output
--
--
-2.0
45
-10
50
TS494
3-7
2003/12 rev. A
Electrical Characteristics (continues)
PWM COMPARATOR SECTION
Parameter
Input threshold voltage (pin 3)
Input sink current (pin 3)
TOTAL DEVICE
Standby supply current
pin 6 at Vref, all
other inputs and
outputs open
Average supply current
SWITCHING CHARACTERISTICS
Output voltage rise time
Output voltage fall time
Output voltage rise time
Output voltage fall time
UNDERVOLTAGE LOCKOUT SECTION
Turn-on Threshold
Vcc increasing Iref = 1.0mA
5.5
6.43
7.0
V
Common-emitter configuration,
See Figure 3
Emitter-follower configuration,
See Figure 4
--
--
--
--
100
25
100
40
200
100
200
100
ns
Vi (pin4)= 2V, See Figure 1
--
7.5
--
Vcc=15V
Vcc=40V
--
--
6.0
9.0
10
15
mA
Test Conditions*
Zero duty cycle
V (pin 3)=0.7V
Min
--
0.3
Typ
4.0
0.7
Max
4.5
--
Unit
V
mA
Remark:
o
All typical value except for temperature coefficient are at Ta= 25 C
For conditions shown as Min or Max, use the appropriate value specified under recommended operating
conditions.
All typical values except for parameter changes with temperature are at Ta= 25
o
C
Duration of the short-circuit should not exceed one second
Standard deviation is a measure of the statistical distribution about the mean as derived from the formula
⎡
N
(
x
−
x
)
2
⎤
⎥
σ
= ⎢
∑
n
N
−
1
⎥
⎢
n
=
1
⎦
⎣
1
2
Temperature coefficient of timing capacitor and timing resistor not taken into account
TS494
4-7
2003/12 rev. A
Parameter Measurement Information
TS494
5-7
2003/12 rev. A
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