SL494 [SLS]
PWM Control Circuit; PWM控制电路
| 型号： | SL494 |
| 厂家： | 
SYSTEM LOGIC SEMICONDUCTOR |
| 描述： | PWM Control Circuit |
| 文件： | 总4页 (文件大小：42K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SL494
PWM Control Circuit
The SL494 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, the SL494
contains an on-chip 5-volt regulator, two error amplifiers, adjustable
oscillator, dead-time control comparator, pulse-steering flip-flop, and
output-control circuitry. The uncommitted output transistors provide
either common-emitter or emitter-follower output capability. Push-pull
or single-ended output operation may be selected through the output-
control function. The architecture of the IL494 prohibits the possibility
of either output being pulsed twice during push-pull operation.
ORDERING INFORMATION
SL494N Plastic
SL494D SOIC
TA = -20°C to 85° C
for all packages
·
·
·
·
·
·
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200 mA Sink or Source
Output Control Selects Single-Ended or Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at Either Output
Internal Regulator Provides a Stable 5 V Reference Supply
Variable Dead-Time Provides Control Over Total Range
PIN ASSIGNMENT
FUNCTION TABLE
Output Control
Grounded
At Vref
Output Function
Single-ended or Parallel Output
Normal Push-Pull Operation
LOGIC DIAGRAM
System Logic
Semiconductor
SLS
SL494
MAXIMUM RATINGS
Symbol
Parameter
Value
41
Unit
V
VCC
Supply Voltage
V
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
Storage Temperature
VCC +0.3
41
V
I
VO
V
250
mA
°C
Tstg
-65 to +150
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
7
Max
40
Unit
VCC
Supply Voltage
V
V
V
I
Amplifier Input Voltage
Collector Output Voltage
-0.3
VCC - 2
40
VO
V
Collector Output Current (Each Transistor)
Current Into Feed back Terminal
Timing Capacitor
200
mA
mA
nF
0.3
CT
RT
0.47
1.8
1
10.000
500
Timing Resistor
KW
KHz
°C
Oscillator Frequency
300
TA
Operating Free-Air Temperature
-20
+85
System Logic
Semiconductor
SLS
SL494
ELECTRICAL CHARACTERISTICS (Temperature -20 ~ 85°C, VCC = 15 V, f=10 kHz))
Symbol
Parameter
Test Conditions
Min
Max
Unit
Reference Section
V
Output Voltage
IO=1 mA
4.75
5.25
25
15
1
V
ref
V
regin
Output regulation
Input regulation
VCC=7 V to 40 V, TA=25°C
IO=1 to 10 mA, TA=25°C
mV
mV
%
V
regout
DV
Output Voltage change with TA= -20°C to 85°C
ref
temperature
ISC
Short-circuit output current
(Note 1)
Vref=0
50
mA
Oscillator Section
fOSC
Frequency
CT=0.01 mF, RT=12 kW
6
14
15
KHz
%
dfOSC
Standard deviation of
frequency (Note 2)
All values of VCC, CT, RT, TA
Constant
dfOSC(DV)
dfOSC(DT)
Frequency change with
voltage
VCC= 7 V to 40 V,
TA=25°C
10
2
%
%
Frequency change with
temperature
CT=0.01 mF, RT=12 kW
TA= -20°C to 85°C
Dead Time Control Section
IIB(2T)
Input bias current (pin 4)
V = 0 to 5.25 V
-10
3.3
mA
I
DCmax
Maximum duty cycle, each
output
VI(pin 4)=0 V
45
0
%
VTHD
Input threshold voltage
(pin 4)
Zero duty cycle
V
Maximum duty cycle
Error Amp Section
Input offset voltage
V
IO
VO(pin 3)=2.5 V
VO(pin 3)=2.5 V
VO(pin 3)=2.5 V
VCC= 7 V to 40 V
10
250
1
mV
nA
mA
V
IIO
IIB
Input offset current
Input bias current
Common-mode input
voltage range
LOW
HIGH
-0.3
VCC - 2
70
Avol
Open-loop voltage
amplification
DVO=3 V, VO=0.5 to 3.5 V
dB
fb
CMRR
IO
Unity-gain bandwidth
100
65
kHz
dB
Common-mode rejection ratio VCC=40 V, TA=25°C
Output sink current (pin 3)
V =-15 mV to -5 V,
0.3
mA
ID
VO(pin 3)=0.7 V
IO+
Output source current
(pin 3)
V =15 mV to 5 V,
VO(pin 3)=3.5 V
-2
mA
ID
System Logic
Semiconductor
SLS
SL494
ELECTRICAL CHARACTERISTICS(Temperature -20 ~ 85°C, VCC = 15 V, f=10 kHz))
Symbol
PWM Comparator Section
VTHP Input threshold voltage
Parameter
Test Conditions
Min
Max
Unit
Zero duty cycle
4.5
V
(pin 3)
II
Input sink current (pin 3)
VO(pin 3)=0.7 V
0.3
mA
Switching Characteristics
trc
tfc
trf
tff
Output voltage rise time
Common-emitter configuration
Common-emitter configuration
Emitter-follower configuration
Emitter-follower configuration
200
100
200
100
ns
ns
ns
ns
Output voltage fall time
Output voltage rise time
Output voltage fall time
Output Section
IC(off) Collector off-state current
IE(off) Emitter off-state current
VCE=40 V, V =40 V
100
-100
1.3
mA
mA
V
CC
VCC=VC=40 V, V =0
E
V
Collector-
emitter
Common-
emitter
VE=0, IC=200 mA
SAT
saturation
voltage
Emitter-
follower
VC=15 V, IE=-200 mA
2.5
3.5
IOCH
Output control input current V =V
mA
mA
mA
I
ref
Total Device
ICC
Standby supply current
All other inputs &
outputs open
VCC=15 V
VCC=40 V
10
15
17
ICCA
Average supply current
V(pin 4)=2 V
Notes: 1. Duration of the short circuit should not exceed one second.
2. Standard deviation is a measure of the statistical disribution about the mean as derived from the formula
N
å (x - x)2
n
n=1
s =
N - 1
System Logic
SLS
Semiconductor
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