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UC2844BD1R2 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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UC2844BD1R2
ON-Semiconductor
ON Semiconductor ON-Semiconductor
UC2844BD1R2 Datasheet PDF : 20 Pages
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UC3844B, UC3845B, UC2844B, UC2845B
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 4], 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 5], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
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 mA
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 6 & 7)
(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 6)
(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 6)
Input Bias Current
Propagation Delay (Current Sense Input to Output)
PSRR
70
IIB
− − 2.0 −10
tPLH(In/Out)
150 300
70
dB
− − 2.0 −10 mA
150 300 ns
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
(ISink = 200 mA, UC284XB, UC384XB)
(ISink = 200 mA, UC384XBV)
High State (ISource = 20 mA, UC284XB, UC384XB)
(ISource = 20 mA, UC384XBV)
(ISource = 200 mA)
V
VOL
0.1 0.4
0.1 0.4
1.6 2.2
1.6 2.2
1.6 2.3
VOH
13 13.5 −
13 13.5 −
− 12.9 −
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
UCX844B, BV
UCX845B, 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
UCX844B, BV
UCX845B, 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
4. Adjust VCC above the Startup threshold before setting to 15 V.
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for UC3844B, UC3845B
= − 25°C for UC2844B, UC2845B
Thigh = + 70°C for UC3844B, UC3845B
= + 85°C for UC2844B, UC2845B
= − 40°C for UC3844BV, UC3845BV
= +105°C for UC3844BV, UC3845BV
6. This parameter is measured at the latch trip point with VFB = 0 V.
7.
Comparator gain is defined as: AV =
DV Output/Compensation
DV Current Sense Input
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