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UC2842BD View Datasheet(PDF) - Motorola => Freescale

Part Name
Description
Manufacturer
UC2842BD
Motorola
Motorola => Freescale Motorola
UC2842BD Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
UC3842B, 43B UC2842B, 43B
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)
Input Bias Current (VFB = 5.0 V)
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
Unity Gain Bandwidth (TJ = 25°C)
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
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)
VFB
IIB
AVOL
BW
PSRR
ISink
ISource
VOH
VOL
2.45
2.5
2.55 2.42
2.5
2.58
V
– 0.1 –1.0
– 0.1 – 2.0
µA
65
90
65
90
dB
0.7
1.0
0.7
1.0
MHz
60
70
60
70
dB
mA
2.0
12
2.0
12
– 0.5 –1.0
– 0.5 –1.0
V
5.0
6.2
5.0
6.2
0.8
1.1
0.8
1.1
0.8
1.2
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 4 & 5)
(UC284XB, UC384XB)
(UC384XBV)
AV
V/V
2.85
3.0
3.15 2.85
3.0
3.15
2.85
3.0
3.25
Maximum Current Sense Input Threshold (Note 4)
(UC284XB, UC384XB)
(UC384XBV)
Vth
V
0.9
1.0
1.1
0.9
1.0
1.1
0.85
1.0
1.1
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
V
0.1
0.4
0.1
0.4
1.6
2.2
1.6
2.2
1.6
2.3
13
13.5
13
13.5
12.9 13.5
12
13.4
12
13.4
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
V
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 (VCC)
UCX842B, BV
UCX843B, BV
VCC(min)
V
9.0
10
11
8.5
10
11.5
7.0
7.6
8.2
7.0
7.6
8.2
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
MOTOROLA ANALOG IC DEVICE DATA
3
 

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