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UC3844 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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UC3844 Datasheet(HTML) 3 Page - ON Semiconductor

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UC3844, 45 UC2844, 45
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted,)
UC284X
UC384X
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB
2.45
2.5
2.55
2.42
2.5
2.58
V
Input Bias Current (VFB = 2.7 V)
IIB
–0.1
–1.0
–0.1
–2.0
µA
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
AVOL
65
90
65
90
dB
Unity Gain Bandwidth (TJ = 25°C)
BW
0.7
1.0
0.7
1.0
MHz
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
PSRR
60
70
60
70
dB
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
ISink
ISource
2.0
–0.5
12
–1.0
2.0
–0.5
12
–1.0
mA
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
0.8
1.1
5.0
6.2
0.8
1.1
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 4 & 5)
AV
2.85
3.0
3.15
2.85
3.0
3.15
V/V
Maximum Current Sense Input Threshold (Note 4)
Vth
0.9
1.0
1.1
0.9
1.0
1.1
V
Power Supply Rejection Ratio
VCC = 12 V to 25 V (Note 4)
PSRR
70
70
dB
Input Bias Current
IIB
–2.0
–10
–2.0
–10
µA
Propagation Delay (Current Sense Input to Output)
tPLH(IN/OUT)
150
300
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
(ISink = 200 mA)
High State (ISink = 20 mA)
(ISink = 200 mA)
VOL
VOH
12
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12
0.1
1.6
13.5
13.4
0.4
2.2
V
Output Voltage with UVLO Activated
VCC = 6.0 V, ISink = 1.0 mA
VOL(UVLO)
0.1
1.1
0.1
1.1
V
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
tr
50
150
50
150
ns
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
tf
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX844
UCX845
Vth
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After Turn–On
UCX844
UCX845
VCC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
V
PWM SECTION
Duty Cycle
Maximum
Minimum
DCmax
DCmin
46
48
50
0
47
48
50
0
%
TOTAL DEVICE
Power Supply Current (Note 2)
Startup:
(VCC = 6.5 V for UCX845A,
(VCC 14 V for UCX844) Operating
ICC
0.5
12
1.0
17
0.5
12
1.0
17
mA
Power Supply Zener Voltage (ICC = 25 mA)
VZ
30
36
30
36
V
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 UC3844, UC3845
Thigh = +70°C for UC3844, UC3845
Tlow = –25°C for UC2844, UC2845
Thigh = +85°C for UC2844, UC2845
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


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