TS1451
Dual Channel PWM Controller
SOP-16
DIP-16
Supply Voltage Range 3.6 V to 40V
Output Driving Current 20mA
Oscillator Frequency up to 500KHz
General Description
The TS1451 integrates dual channel PWM control circuit into a single chip, mainly designs for power supply regulator.
All the functions included an on-chip 2.5V reference output, two error amplifiers, and adjustable oscillator, two
dead-time comparators, under voltage lock out, short circuit protection, and dual common-emitter output transistor
circuit.
Recommend the output CE transistors as pre-driver for driving extremely. the dead time control can provide from 0% to
100%. Switching frequency can be adjustable by trimming RT and CT. During low Vcc situation, the under voltage lock
out makes sure that the output are off until the internal circuit is operational normally.
The TS1451 is offered in SOP-16 and DIP-16 package.
Features
Dual PWM Power Control Circuitry
Operating Voltage Can be up to 50V
Adjustable Dead Time Control (DTC)
Under Voltage Lock Out protection (UVLO)
Short Circuit Protection (SCP)
Variable Oscillator Frequency up to 500KHz
2.5V Voltage Reference Output
Pin Assignments
Applications
Backlight Inverter
DC to DC Converters in Computers
Pin Descriptions
Name
CT
RT
EA+
Descriptions
Timing Capacitor
Timing Resistor
Error Amplifier Input (+)
Error Amplifier Input (-)
Feedback Loop Compensation
Dead Time Control
Pre-Driver Output
Ground
Supply Voltage
Short Circuit Protection
Voltage Reference
Ordering Information
Part No.
TS1451CD
TS1451CS
EA-
FB
Operating Temp.
0 ~ +70 C
o
Package
DIP-16
SOP-16
DTC
Out
Gnd
Vcc
SCP
Ref
TS1451
1-7
2003/12 rev. A
Function Block Diagram
Absolute Maximum Rating
Rating
Power Supply Voltage
Collector Output Voltage
Collector Output Current
Amplifier Input Voltage Range
Operating Junction Temperature
Storage Temperature Range
Lead Temperature 1.6mm from case for 10 sec.
Symbol
Vcc
Vo
Io
Vin
Tj
Tstg
Tled
Value
40
40
21
20
- 20 ~ +85
-65 ~ +150
260
Unit
V
V
mA
V
o
o
o
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
Feedback Resistor
Timing Resistor
Timing Capacitor
Oscillator Frequency
Symbol
Vcc
Vo
Io
Vin
Ifb
Rf
R
T
C
T
Fosc
Min.
3.6
--
--
1.05
--
100
5.1
150
1
Max
40
40
20
1.45
45
--
100
15000
500
Unit
V
V
mA
V
uA
KΩ
KΩ
pF
KHz
TS1451
2-7
2003/12 rev. A
Electrical Characteristics
(Ta= 25
o
C, V
CC
= 6V, f= 200KHz; unless otherwise specified)
REFERENCE SECTION
Parameter
Output voltage (Vref)
Line regulation
Load regulation
Output voltage change with temp.
Short-circuit output current
UNDERVOLTAGE LOCKOUT SECTION
Parameter
Upper threshold voltage (Vcc)
Lower threshold voltage (Vcc)
Hysterics (Vcc)
SHORT-CIRCUIT PROTECTION CONTROL SECTION
Parameter
Input threshold voltage
Standby voltage
Latched input voltage
Input (source) current
Comparator threshold voltage (FB)
OSCILLATOR SECTION
Parameter
Frequency
Standard deviation of frequency
Frequency change with voltage
Frequency change with temperature
DEAD-TIME CONTROL SECTION
Parameter
Input bias current
Latch mode (source) current
Latch input voltage
Input threshold voltage at f= 10KHz
Io= 40uA
Zero duty cycle
Maximum duty cycle
OUTPUT SECTION
Parameter
Leakage current
Output saturation voltage
Short-circuit output current
Test Conditions
Vo= 40V
Io= 10mA
Vo= 6V
Min
--
--
--
Typ
--
1.2
90
Max
10
2
--
Unit
uA
V
mA
Test Conditions
Min
--
- 80
2.3
--
1.2
Typ
--
- 145
--
2.05
1.45
Max
1
--
--
2.25
--
V
Unit
uA
Test Conditions
C
T
= 330pF, R
T
= 10KΩ
C
T
= 330pF, R
T
= 10KΩ
Vcc= 3.6V to 40V
∆Ta=
Min to Max
Min
--
--
--
--
Typ
200
10
1
--
Max
--
--
--
+/- 2
%
Unit
KHz
No pull up
No pull up
Vin= 0.7V
Test Conditions
Min
0.65
140
--
- 10
--
Typ
0.7
185
60
- 15
1.18
Max
0.75
--230
120
- 20
--
Unit
V
mV
mV
uA
V
Io(ref)= 0.1mA
Test Conditions
Min
--
--
80
Typ
2.65
2.45
200
Max
--
--
--
Unit
V
V
mV
Test Conditions
Io=1mA
Vcc= 3.6V to 40V
Io= 0.1mA to 1mA
∆Ta=Min
to Max
Vref= 0
Min
2.45
--
--
--
3
Typ
2.5
2.0
1.0
- 0.2
10
Max
2.6
12.5
7.5
+/-1
30
Unit
V
mV
%
mA
TS1451
3-7
2003/12 rev. A
Electrical Characteristics
(Continued)
ERROR AMPLIFIER SECTION
Parameter
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
Maximum output voltage
Minimum output voltage
Output sink current (FB)
Output source current (FB)
PWM COMPARATOR SECTION
Parameter
Input threshold voltage (FB)
f= 10KHz
Input sink current (pin 3)
TOTAL DEVICE
Parameter
Standby supply current
Average supply current
Test Conditions
Off-state
RT= 10KΩ
Min
--
--
Typ
2.5
2.8
Max
3.0
3.5
Unit
mA
Maximum duty cycle
1.2
1.45
--
mA
Test Conditions
Zero duty cycle
Min
--
Typ
2.05
Max
2.25
Unit
V
V
ID
= -0.1, Vo= 1.25V
V
ID
= 0.1, Vo= 1.25V
Test Conditions
Vo(FB)= 1.25V
Vo(FB)= 1.25V
Vo(FB)= 1.25V
Vcc= 3.6V to 40V
Rf= 200KΩ
70
--
60
Vref-0.1
--
0.5
-45
Min
--
--
--
Typ
--
--
160
1.05 to 1.45
80
1.5
80
--
--
1.6
-70
--
--
--
--
1
--
--
Max
+/- 6
+/- 100
500
Unit
mV
nA
nA
V
dB
MHz
dB
V
V
mA
uA
TS1451
4-7
2003/12 rev. A
Parameter Measurement Information
TS1451
5-7
2003/12 rev. A
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