CP494
SWITCHMODE Pulse Width Modulation Control Circuit
ELECTRICAL CHARACTERISTICS (V = 15 V, C = 0.01 mF, R = 12 kW, unless otherwise noted.)
CC
T
T
For typical values T = 25°C, for min/max values T is the operating ambient temperature range that applies, unless otherwise noted.
A
A
Characteristics
ERROR AMPLIFIER SECTION
Symbol
Min
Typ
Max
Unit
Input Offset Voltage (V
= 2.5 V)
= 2.5 V)
V
–
–
–
2.0
5.0
10
mV
nA
O (Pin 3)
O (Pin 3)
IO
Input Offset Current (V
I
IO
250
–1.0
Input Bias Current (V
= 2.5 V)
I
IB
–0.1
mA
O (Pin 3)
Input Common Mode Voltage Range (V = 40 V, T = 25°C)
V
ICR
–0.3 to V –2.0
V
CC
A
CC
Open Loop Voltage Gain (DV = 3.0 V, V = 0.5 V to 3.5 V, R = 2.0 kW)
A
VOL
70
–
95
350
65
–
–
–
–
–
–
–
dB
O
O
L
Unity–Gain Crossover Frequency (V = 0.5 V to 3.5 V, R = 2.0 kW)
f
C–
kHz
deg.
dB
O
L
Phase Margin at Unity–Gain (V = 0.5 V to 3.5 V, R = 2.0 kW)
f
m
–
O
L
Common Mode Rejection Ratio (V = 40 V)
CMRR
65
–
90
CC
Power Supply Rejection Ratio (DV = 33 V, V = 2.5 V, R = 2.0 kW)
PSRR
100
0.7
–4.0
dB
CC
O
L
Output Sink Current (V
= 0.7 V)
I
O–
0.3
2.0
mA
mA
O (Pin 3)
Output Source Current (V
= 3.5 V)
I +
O
O (Pin 3)
PWM COMPARATOR SECTION (Test Circuit Figure 11)
Input Threshold Voltage (Zero Duty Cycle)
V
I
–
2.5
0.7
4.5
–
V
TH
Input Sink Current (V
= 0.7 V)
0.3
mA
(Pin 3)
I–
DEADTIME CONTROL SECTION (Test Circuit Figure 11)
Input Bias Current (Pin 4) (V = 0 V to 5.25 V)
I
–
–2.0
–10
mA
Pin 4
IB (DT)
Maximum Duty Cycle, Each Output, Push–Pull Mode
DC
%
max
(V
Pin 4
(V
Pin 4
= 0 V, C = 0.01 mF, R = 12 kW)
45
–
48
45
50
50
T
T
= 0 V, C = 0.001 mF, R = 30 kW)
T
T
Input Threshold Voltage (Pin 4)
(Zero Duty Cycle)
(Maximum Duty Cycle)
V
th
V
–
0
2.8
–
3.3
–
OSCILLATOR SECTION
Frequency (C = 0.001 mF, R = 30 kW)
f
osc
–
–
–
–
40
3.0
0.1
–
–
–
kHz
%
T
T
Standard Deviation of Frequency* (C = 0.001 mF, R = 30 kW)
sf
osc
T
T
Frequency Change with Voltage (V = 7.0 V to 40 V, T = 25°C)
Df
Df
(DV)
(DT)
–
%
CC
A
osc
osc
Frequency Change with Temperature (DT = T
to T
)
12
%
A
low
high
(C = 0.01 mF, R = 12 kW)
T
T
UNDERVOLTAGE LOCKOUT SECTION
Turn–On Threshold (V increasing, I = 1.0 mA)
V
th
5.5
6.43
7.0
V
CC
ref
TOTAL DEVICE
Standby Supply Current (Pin 6 at V , All other inputs and outputs open)
I
mA
ref
CC
(V = 15 V)
(V = 40 V)
CC
–
–
5.5
7.0
10
15
CC
Average Supply Current
mA
(C = 0.01 mF, R = 12 kW, V = 2.0 V)
(Pin 4)
–
7.0
–
T
T
(V = 15 V) (See Figure 12)
CC
N
2
S (X – X)
n
* Standard deviation is a measure of the statistical distribution about the mean as derived from the formula, s
n = 1
N – 1
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Tel:886-3-3214525
Email: server@ceramate.com.tw
Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004
Page 3 of 11
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
