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TL494N PDF Datasheet - Pulse-Width-Modulation Control Circuits - HTC

Part Number TL494N
Description Pulse-Width-Modulation Control Circuits
Manufacturers HTC 
Logo HTC Logo 
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TL494N datasheet, circuit
Pulse-Width-Modulation Control Circuits
TL494
FEATURES
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200 mA 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,5%
Circuit Architecture Allows Easy Synchronization
Moisture Sensitivity Level 3
Error
AMP 1
NONINV
INPUT
INV INPUT
FEEDBAC
DKEAD-TIME
CONTROL
CT
RT
GND
C1
SOP16/DIP16
(TOP VIEW)
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
NONINV
INPUT
INV INPUT
Error
AMP 2
REF OUT
OUTPUT
CONTROL
Vcc
C2
E2
E1
DESCRIPTION
The TL494 incorporate on a single monolithic chip all the functions
required in the construction of a pulse-width-modulation control,
these devices offer the systems engineer the flexibility to tailor
the power supply control circuitry to his application.
ORDERING INFORMATION
Device
Package
The TL494 contains an error amplifier, an on-chip adjustable
TL494D
16 SOP
oscillator, a dead-time control comparator, pulse-steering control
TL494N
16 DIP
flip-flop, a 5-volt, 5% precision regulator, and output-control circuit.
The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control
comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip
oscillator may be bypassed by terminating R T (pin 6) to the reference output and providing a sawtooth in put to
CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The
uncommited output transistors 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 funct
-ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push
-pull operation.
Functional Block Diagram
RT
CT
OSCILLATOR
DEAD
TIME
CONTROL
0.1V
DEAD-TIME CONTROL COMPARATOR
NONINVERTING INPUT
INVERTING INPUT
ERROR AMPLIFIER
+
1
-
NONINVERTING INPUT
INVERTING INPUT
ERROR AMPLIFIER
+
2
-
PWM COMPARATOR
FEEDBACK
OUTPUT CONTROL
C1
PULSE-STEERING FLIP-FLOP
REFERENCE
Q1
C1
E1
Q2
C2
E2
Vcc
Vref
GND
2008 - Ver. 1.2
1/6
HTC

1 page

TL494N pdf, schematic
Pulse-Width-Modulation Control Circuits
Parameter measurement information
TL494
Vcc = 15V
TEST
INPUTS
50KΩ
DEAD-TIME
Vcc
12KΩ
0.01uF
FEEDBACK
RT
CT
(+)
(-) ERROR
(+)
(-)
OUTPUT
CONTROL
GND
150 Ω
2W
150 Ω
2W
C1 OUTPUT 1
E1 OUTPUT 2
C2
E2
REF OUT
TEST CIRCUIT
VOLTAGE
AT C1
VOLTAGE
AT C2
VOLTAGE
AT CT
DEAD-TIME
CONTROL
INPUT
FEEDBACK
THRESHOLD VOLTAGE
0V
THRESHOLD VOLTAGE
DUTY
CIRCLE
0.7 V
0%
MAX
0%
FIGURE 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
Vcc
0
Vcc
0
2008 - Ver. 1.2
2/6
HTC

2 Page

TL494N equivalent
Pulse-Width-Modulation Control Circuits
TL494
Electrical characteristics over recommended operating free-air temperature range,
Vcc=15V, f=10kHz (unless otherwise noted)
Amplifier section (See Figure 2)
SYMBOL
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
Output sink current (pin 3)
Output source current (pin 3)
TEST CONDITIONS
Vo(pin 3)=2.5V
Vo(pin 3)=2.5V
Vo(pin 3)=2.5V
Vcc = 7V to 40V
Vo=3V, RL=2K, Vo=0.5~3.5V
Vo=0.5~3.5V, RL=2K
Vo= 40V, TA= 25oC
VID=-15mV~-5V, V(pin3)=0.7V
VID=15mV~5V, V(pin3)=3.5V
MIN.
-0.3~-2
70
65
0.3
-2
TYP**.
2
25
0.2
95
800
80
0.7
MAX. UNIT
10
250 nA
1
V
dB
kHz
dB
mA
mA
*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 oC
*** 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.
***** Temperature coefficient of timing capacitor and timing resistor not taken into account.
Output section
PARAMETER
Collector off-state current
Emitter off-state current
Collector-emitter saturation voltage
Common-emitter
Emitter-follower
Output control input current
TEST CONDITIONS
VCE=40V, Vcc=40V
VCC=VC=40V,VE=0
VE=0, IC=200mA
Vc=15V, IE=-200mA
VI=Vref
MIN.
TYP*
2
1.1
1.5
MAX. UNIT
100
-100
1.3
2.5
V
3.5 mA
Dead-time control-section (See Figure 1)
PARAMETER
Input bias current(pin4)
Maximum duty cycle, each output
Input threshold voltage(pin 4)
TEST CONDITIONS
VI=0 to 5.25V
VI (pin 4)=0, CT=0.1uF, RT=12K
Zero duty cycle
Maximum duty cycle
MIN.
0
TYP*
-2
45
3
MAX. UNIT
-10
%
3.3 V
PMW comparator section (See Figure 1)
PARAMETER
Input threshold voltage (pin3)
Input sink current (pin 3)
TEST CONDITIONS
Zero duty cycle
V(pin3) = 0.7V
MIN.
0.3
TYP*
4
0.7
MAX. UNIT
4.5 V
mA
Total device
PARAMETER
Standby supply current
Average supply current
TEST CONDITIONS
Pin 6 at Vref, all other inputs
and outputs open
VI(pin 4)= 2V
VCC=15V
VCC=40V
MIN.
TYP*
6
9
7.5
MAX. UNIT
10
15 mA
2008 - Ver. 1.2
5/6
HTC

5 Page





Information Total 6 Pages
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