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UC2842A View Datasheet(PDF) - Motorola => Freescale

Part NameUC2842A Motorola
Motorola => Freescale Motorola
DescriptionHIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC2842A Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
UC3842A, 43A UC2842A, 43A
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted.)
UC284XA
UC384XA
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB
2.45
2.5
2.55 2.42
2.5
2.58
Input Bias Current (VFB = 2.7 V)
IIB
–0.1 –1.0
–0.1 –2.0
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
Unity Gain Bandwidth (TJ = 25°C)
AVOL
65
90
65
90
BW
0.7
1.0
0.7
1.0
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
PSRR
60
70
60
70
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
ISink
2.0
12
2.0
12
ISource
–0.5 –1.0
–0.5 –1.0
Output Voltage Swing
High State (RL = 15 k to ground, VFB = 2.3 V)
Low State (RL = 15 k to Vref, VFB = 2.7 V)
VOH
VOL
5.0
6.2
5.0
6.2
0.8
1.1
0.8
1.1
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 4 & 5)
AV
2.85
3.0
3.15 2.85
3.0
3.15
Maximum Current Sense Input Threshold (Note 4)
Vth
0.9
1.0
1.1
0.9
1.0
1.1
Power Supply Rejection Ratio
VCC = 12 to 25 V (Note 4)
PSRR
70
70
Input Bias Current
IIB
–2.0
–10
–2.0
–10
Propagation Delay (Current Sense Input to Output) tPLH(in/out)
150
300
150
300
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
Low State (ISink = 200 mA)
High State (ISink = 20 mA)
High State (ISink = 200 mA)
Output Voltage with UVLO Activated
VCC = 6.0 V, ISink = 1.0 mA
VOL
VOH
0.1
0.4
1.6
2.2
13
13.5
12
13.4
VOL(UVLO)
0.1
1.1
0.1
0.4
1.6
2.2
13
13.5
12
13.4
0.1
1.1
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
tr
50
150
50
150
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
tf
50
150
50
150
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX842A
UCX843A
Vth
15
16
17
14.5
16
17.5
7.8
8.4
9.0
7.8
8.4
9.0
Minimum Operating Voltage After Turn–On
UCX842A
UCX843A
VCC(min)
9.0
10
11
8.5
10
11.5
7.0
7.6
8.2
7.0
7.6
8.2
PWM SECTION
Duty Cycle
Maximum
Minimum
DCmax
94
96
94
96
DCmin
0
0
TOTAL DEVICE
Power Supply Current (Note 2)
ICC
Startup:
(VCC = 6.5 V for UCX843A,
(VCC = 14 V for UCX842A) Operating
0.5
1.0
0.5
1.0
12
17
12
17
Power Supply Zener Voltage (ICC = 25 mA)
VZ
30
36
30
36
NOTES: 2. Adjust VCC above the Startup threshold before setting to 15 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible
Tlow = –20°C for UC3842A, UC3843A
Thigh = +70°C for UC3842A, UC3843A
Tlow = –25°C for UC2842A, UC2843A
Thigh = +85°C for UC2842A, UC2843A
4. This parameter is measured at the latch trip point with VFB = 0 V.
5. Comparator gain is defined as: AV V Output Compensation
V Current Sense Input
Unit
V
µA
dB
MHz
dB
mA
V
V/V
V
dB
µA
ns
V
V
ns
ns
V
V
%
mA
V
MOTOROLA ANALOG IC DEVICE DATA
3
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