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UC3842B Datasheet(PDF) 3 Page - Motorola, Inc

Part # UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3842B Datasheet(HTML) 3 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 2], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values TA is
the operating ambient temperature range that applies [Note 3], unless otherwise noted.)
UC284XB
UC384XB, XBV
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 = 5.0 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)
(UC284XB, UC384XB)
(UC384XBV)
VOH
VOL
5.0
6.2
0.8
1.1
5.0
6.2
0.8
0.8
1.1
1.2
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 4 & 5)
(UC284XB, UC384XB)
(UC384XBV)
AV
2.85
3.0
3.15
2.85
2.85
3.0
3.0
3.15
3.25
V/V
Maximum Current Sense Input Threshold (Note 4)
(UC284XB, UC384XB)
(UC384XBV)
Vth
0.9
1.0
1.1
0.9
0.85
1.0
1.0
1.1
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) (UC284XB, UC384XB)
(UC384XBV)
High State
(ISource = 20 mA) (UC284XB, UC384XB)
(UC384XBV)
(ISource = 200 mA)
VOL
VOH
13
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12.9
12
0.1
1.6
1.6
13.5
13.5
13.4
0.4
2.2
2.3
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 (VCC)
UCX842B, BV
UCX843B, BV
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 (VCC)
UCX842B, BV
UCX843B, BV
VCC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
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 =0°C for UC3842B, UC3843B
Thigh = +70°C for UC3842B, UC3843B
Tlow = –25°C for UC2842B, UC2843B
Thigh = +85°C for UC2842B, UC2843B
Tlow = –40°C for UC3842BV, UC3843BV
Thigh = +105°C for UC3842BV, UC3843BV
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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