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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC494
SWITCHING REGULATOR CONTROL CIRCUIT
DESCRIPTION
The
µ
PC494 is an inverter control unit which provides all the control circuitry for PWM type switching regulators.
Included in this device is the voltage reference, dual error amplifiers, oscillator, pulse width modulator, pulse
steering flip flop, dual alternating output switches and dead-time control.
FEATURES
•
Complete PWM power control circuit.
•
Adjustable dead-time (0 to 100%).
•
No double pulsing of same output during load transient condition.
•
Dual error amplifiers have wide common mode input voltage capability (
−
0.3 V to V
CC
−
2 V).
•
Circuit architecture provides easy synchronization.
•
Uncommitted outputs for 250-mA sink or source.
•
With miss-operation prevention circuit for low level supply voltage.
•
Full pin-compatible TL494C.
5
ORDERING INFORMATION
Part Number
Package
16-pin plastic DIP (7.62 mm (300))
16-pin plastic SOP (9.53 mm (375))
16-pin plastic SOP (7.62 mm (300))
5
PIN CONFIGURATION (Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Non-Inv. Input
Inv. Input
Ref Out
Output Control
V
CC
C
2
E
2
E
1
Non-Inv. Input
Inv. Input
Feed-Back
Dead-Time
Control
C
T
R
T
GND
C
1
µ
PC494C
µ
PC494G
µ
PC494GS
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G12649EJ4V0DS00 (4th edition)
(Previous No. IC-1299)
Date Published November 2000 NS CP(K)
Printed in Japan
The mark
5
shows major revised points.
©
1988,2000
µ
PC494
BLOCK DIAGRAM
V
CC
12
Ref Out 14
GND 7
R
T
6
C
T
5
Dead-Time
Control 4
Non-Inv. Input
Inv. Input
Non-Inv. Input
Inv. Input
1
2
16
15
+
–
+
+
–
+
–
13 Output Control
Reference Low Voltage
Regulator
Stop
F
T/
F
Oscillator
Dead-Time
Comparator
8
9
11
10
C
1
E
1
C
2
E
2
EA I
EA II
–
PWM
Comparator
Feed-Back 3
2
Data Sheet G12649EJ4V0DS00
µ
PC494
5
ABSOLUTE MAXIMUM RATINGS (T
A
= 25°C, unless otherwise noted)
°
Characteristics
Supply Voltage
Error Amplifier Input Voltage
Output Voltage
Output Current
Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
V
CC
V
ICM
V
CER
I
C
P
T
T
A
T
stg
µ
PC494C
−0.3
to +41
µ
PC494G
−0.3
to +41
µ
PC494GS
−0.3
to +41
Unit
V
V
V
mA
mW
°C
°C
−0.3
to V
CC
+ 0.3
−0.3
to V
CC
+ 0.3
−0.3
to V
CC
+ 0.3
−0.3
to +41
250
1000
−20
to +85
−65
to +150
−0.3
to +41
250
780
Note
−20
to +85
−65
to +150
−0.3
to +41
250
650
Note
−20
to +85
−65
to +150
2
Note
With 25 cm x 1.6 mm glass-epoxy substrate.
5
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the
verge of suffering physical damage, and therefore the product must be used under conditions that
ensure that the absolute maximum ratings are not exceeded.
RECOMMENDED OPERATING CONDITIONS
Characteristics
Supply Voltage
Output Voltage
Output Current
Error Amplifier Sink Current
Timing Capacitor
Timing Resistance
Oscillation Frequency
Operating Temperature
Symbol
V
CC
V
CER
I
C
I
OAMP
C
T
R
T
f
OSC
T
opt
0.47
1.8
1
−20
MIN.
7
−0.3
TYP.
MAX.
40
40
200
−0.3
10000
500
300
+70
Unit
V
V
mA
mA
nF
kΩ
kHz
°C
5
Caution The recommended operating range may be exceeded without causing any problems provided that
the absolute maximum ratings are not exceeded. However, if the device is operated in a way that
exceeds the recommended operating conditions, the margin between the actual conditions of use
and the absolute maximum ratings is small, and therefore thorough evaluation is necessary. The
recommended operating conditions do not imply that the device can be used with all values at
their maximum values.
Data Sheet G12649EJ4V0DS00
3
µ
PC494
5
ELECTRICAL SPECIFICATIONS (V
CC
= 15 V, f = 10 kHz,
−
20
”#T
A
”#.:3°
C, unless otherwise noted)
°
(1/2)
Block
Reference
Section
Characteristics
Output Voltage
Line Regulation
Load Regulation
Temperature Coefficient
Short Circuit Output Current
Note1
Oscillator
Section
Frequency
Standard Deviation of Frequency
Note2
Frequency Change with
Temperature
Symbol
V
REF
REG
IN
REG
L
∆V
REF
/∆T
I
SHORT
f
OSC
Conditions
I
REF
= 1 mA, T
A
= 25°C
7 V
”
V
CC
”#40
V,
I
REF
= 1 mA, T
A
= 25°C
1 mA
”
I
REF
”#10
mA,
T
A
= 25°C
−20°C
”
T
A
”#+85°C,
I
REF
= 1 mA
V
REF
= 0 V
C
T
= 0.01
µ
F,
R
T
= 12 kΩ, T
A
= 25°C
7 V
”
V
CC
”#40
V,
T
A
= 25°C, C
T
, R
T
, const.
0°C
”
T
A
”#70°C,
C
T
= 0.01
µ
F,
R
T
= 12 kΩ
7 V
”
V
CC
”#40
V,
T
A
= 25°C,
C
T
= 0.01
µ
F, R
T
= 12 kΩ
0 V
”
V
I
”#5.25
V
V
I
= 0 V
V
TH1
V
TH2
V
IO
I
IO
Output pulse 0% duty
cycle
Output pulse maximum
duty cycle
V
OAMP
= 2.5 V
V
OAMP
= 2.5 V
V
OAMP
= 2.5 V
Low
High
A
V
V
OAMP
= 0.5 to 3.5 V,
T
A
= 25°C
T
A
= 25°C
CMR
V
CC
=#40 V, T
A
= 25°C
V
OAMP
= 0.7 V
V
OAMP
= 3.5 V
Output pulse 0% duty
cycle, see
Figure 1.
V
(pin 3)
=#0.7 V
0.3
V
ICM
7 V
”
V
CC
”#40
V
−0.3
V
CC
−2
60
500
65
0.3
−2
80
830
80
0.7
−10
4
0.7
4.5
dB
kHz
dB
mA
mA
V
mA
0
2
25
0.2
10
250
1
45
1
%
MIN.
4.75
TYP.
5
8
1
0.01
50
10
10
1
2
MAX.
5.25
25
15
0.03
Unit
V
mV
mV
%/°C
mA
kHz
%
%
Frequency Change with Voltage
Dead-
Time
Control
Section
Input Bias Current
Maximum Duty Cycle (Each Output)
Input Threshold Voltage 1
Input Threshold Voltage 2
−2
49
3
−10
µ
A
%
3.3
V
V
mV
nA
Error
Amplifier
Section
Input Offset Voltage
Input Offset Current
Input Bias Current
Common Mode
Input Voltage
µ
A
V
Open Loop Voltage Amplification
Unity Gain Bandwidth
Common Mode Rejection Radio
Output Sink Current
Output Source Current
PWM
Section
Input Threshold Voltage (3-pin)
Input Sink Current
Remark
The TYP. values are values at T
A
= 25°C, except for the characteristics of temperature.
4
Data Sheet G12649EJ4V0DS00
µ
PC494
(2/2)
Block
Output
Section
Emitter Cut-off Current
Characteristics
Collector Cut-off Current
Symbol
I
CER
Conditions
V
CE
=#40 V, V
CC
=#40 V,
Common Emitter
V
CC
=#V
C
=#40 V, V
E
= 0 V,
Emitter Follower
Collector Saturation
Voltage
Common
Emitter
Emitter
Follower
Output Voltage Rise
Time
Output Voltage Fall
Time
Output Voltage Rise
Time
Output Voltage Fall
Time
Total
Device
Bias Current
I
CC(BI)
Standby Current
I
CC(S.B)
V
CC
=#15 V,
all other pins open.
V
(pin 4)
=#2 V,
see
Figure 1.
10
mA
8
12.5
mA
Emitter
Follower
t
f2
t
r2
V
C
=#15 V, R
L
= 150
Ω,
I
E
≅
100 mA, T
A
= 25°C,
see
Figure 1.
70
200
ns
100
200
ns
Common
Emitter
t
f1
t
r1
V
CC
=#15 V, R
L
= 150
Ω,
I
C
≅
100 mA, T
A
= 25°C,
see
Figure 1.
70
200
ns
100
200
ns
V
CE(ON)
I
E
=
−200
mA, V
C
= 15 V
1.6
2.5
V
V
CE(sat)
I
C
= 200 mA, V
E
= 0 V
0.95
1.3
V
−100
MIN.
TYP.
MAX.
100
Unit
µ
A
µ
A
Remark
The TYP. values are values at T
A
= 25
°
C, except for the characteristics of temperature.
Notes 1.
The short circuit output current flows for no more than 1 second. Repeat operation is possible if the internal
heat accumulation is not within a harmful range.
2.
Standard deviation is a measure of the statistical distribution about the mean as derived from the formula ;
N
2
∑
(X
n
−
X)
n=1
N
−
1
σ
=
Calculation expression of frequency f
OSC
is as follows ;
f
OSC
≅
1
0.817 R
T•
C
T
+ 1.42
•
10
−
6
(Hz)
[R
T
] =
Ω
, [C
T
] = F
Data Sheet G12649EJ4V0DS00
5

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