Unless otherwise stated, over recommended operating free-air temperature range,
V
CC
= 15V, f = 10kHz, T
A
= T
J.
PARAMETER
TEST CONDITIONS
Reference Section
Output Voltage V
REF
I
O
= 1mA, T
A
= 25°C
Input Regulation
V
CC
= 7V to 40V
Output Regulation
I
O
= 1mA to 10mA
Output Voltage Over Temperature
∆T
A
= Min. to Max.
Short Circuit Output Current
V
REF
= 0, T
A
= 25°C (Note 1)
Oscillator Section
Frequency (Note 2)
C
T
= 0.01µF, R
T
= 12kΩ
Standard Deviation Of Frequency (Note 3)
All Values of V
CC
, C
T
, R
T
, T
A
Constant
Frequency Change With Voltage
V
CC
= 7V to 40V, T
A
= 25°C
Frequency Change With Temperature
C
T
= 0.01µF, R
T
= 12kΩ,
∆T
A
= Min. to Max.
Deadtime Control Section
(Output Control Connected to V
REF
)
Input Bias Current (Pin 4)
V
(PIN 4)
= 0V to 5.25V
Maximum Duty-Cycle (Each Output)
V
(PIN 4)
= 0V
MIN
4.95
TYP
5
2
1
35
10
10
0.1
2
-2
45
-10
MAX UNITS
5.05
25
15
5.10
50
V
mV
mV
V
mA
kHz
%
%
%
µA
%
4.90
10
2
UC494A/AC
UC495A/AC
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, over recommended operating free-air temperature range,
V
CC
= 15V, f = 10kHz, T
A
= T
J.
PARAMETER
TEST CONDITION
Deadtime Control Section (cont.)
(Output Control Connected to V
REF
)
Input Threshold Voltage (Pin 4)
Zero Duty-Cycle
Maximum Duty-Cycle
Amplifier Section
Input Offset Voltage
V
O (PIN 3)
= 2.5V
Input Offset Current
V
O (PIN 3)
=2.5V
Input Bias Current
V
O (PIN 3)
= 2.5V
Common-Mode Input Voltage Range
V
CC
= 7V to 40V
Open Loop Voltage Gain
∆V
O
= 3V, V
O
= 0.5V to 3.5 V
Unity Gain Bandwidth
Common-Mode Rejection Ratio
V
CC
= 40V, T
A
= 25°C
Output Sink Current (Pin 3)
V
ID
= -15mV to -5V, V
(PIN 3)
= 0.7V
Output Source Current (Pin 3)
V
ID
= 15mV to 5V, V
(PIN 3)
= 3.5V
Output Section
Collector Off-State Current
V
CE
= 40V, V
CC
= 40V
Emitter Off-State Current
V
CC
= V
C
= 40V, V
E
= 0
Collector - Emitter Common-Emitter
V
E
= 0, I
C
= 200mA
Saturation Voltage Emitter-Follower
V
C
= 15V, I
E
= -200mA
Output Control Input Current
V
I
= V
REF
PWM Comparator Section
Input Threshold Voltage (Pin 3)
Zero Duty-Cycle
Input Sink Current (Pin 3)
V
(PIN 3)
= 0.7V
Steering Control
(UC495A, See Function Table)
Input Current
V
(PIN 13)
= 0.4V, Q
1 ACTIVE
V
(PIN 13)
= 2.4V, Q
2 ACTIVE
Deadband
Zener Diode Circuit
(UC495A)
Breakdown Voltage
V
CC
= 45V, I
Z
= 2mA
Sink Current
V
(PIN 15)
= 1V
Total Device
Standby Supply Current
Pin 6 at V
REF
, All other inputs and
outputs open
Under Voltage Lockout
Hysteresis
Switching Characteristics
(T
A
= 25°C)
Output Voltage Rise Time
Output Voltage Fall Time
Output Voltage Rise Time
Output Voltage Fall Time
MIN
TYP
3
0
2
25
-0.2
.03 to
V
CC
-2
70
65
0.3
-2
95
800
80
0.7
10
250
-1
MAX UNITS
3.3
V
V
mV
nA
µA
V
dB
kHz
dB
mA
mA
100
-100
1.3
2.5
3.5
4.5
µA
µA
V
V
mA
V
mA
µA
µA
mV
V
mA
mA
mA
V
mV
ns
ns
ns
ns
2
1.1
1.5
0.3
4
0.7
-200
300
500
36
0.2
V
CC
= 15V
V
CC
= 40V
3.5
300
39
0.3
6
9
45
0.6
10
15
6.5
Common-Emitter Configuration
R
L
= 68Ω, C
L
= 15pF
Emitter-Follower Configuration
R
L
= 68Ω, C
L
=15pF
100
25
100
40
200
100
200
100
Note 1: Duration of the short circuit should not exceed one second.
1.1
Note 2: Frequency for other values of C
T
and R
T i
s approximately
f
=
R
T
C
T
Note 3: Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:
σ
=
√
n
2
Σ (
X
n
−
X
)
n
=
1
.
n
−
1
3
UC494A/AC
UC495A/AC
Figure 1. Slaving Two or More Control Circuits
Figure 2. Output Circuit of Error Amplifiers
Figure 3. Output Connections for Single-Ended and Push-Pull Configurations
Figure 4. Internal Buffer with Deadband for
Steering Control on UC495A
Figure 5. Operation with V
IN
> 40V Using Internal Zener
Figure 6. Error Amplifier Sensing Techniques
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
•MERRIMACK,
NH 03054
TEL. (603) 424-2410
•
FAX (603) 424-3460
4
PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device
UC494ACJ
UC494ACN
UC494AJ
UC494AJ883B
UC494AN
UC495ACN
(1)
Status
(1)
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
Package
Type
CDIP
PDIP
CDIP
CDIP
PDIP
PDIP
Package
Drawing
J
N
J
J
N
N
Pins Package Eco Plan
(2)
Qty
16
16
16
16
16
18
TBD
TBD
TBD
TBD
TBD
TBD
Lead/Ball Finish
Call TI
Call TI
Call TI
Call TI
Call TI
Call TI
MSL Peak Temp
(3)
Call TI
Call TI
Call TI
Call TI
Call TI
Call TI
The marketing status values are defined as follows:
ACTIVE:
Product device recommended for new designs.
LIFEBUY:
TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND:
Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW:
Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE:
TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent
for the latest availability information and additional product content details.
TBD:
The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS):
TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br):
TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The
information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
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