The UC3844B, UC3845B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering, and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50% to 70%.
These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
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Case Outline
MSL Type
MSL Temp (°C)
Container Type
Container Qty.
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Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Reference Price
UC2844BD1R2G
Active
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
$0.2504
More Details
UC2844BDR2G
Active
Pb
A
H
P
SOIC-14
1
260
REEL
2500
N
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
$0.2776
More Details
UC2844BNG
Active
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
$0.52
More Details
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可靠性数据
Die Related Summary Data
Device: UC2844BD1R2G
Equivalent to wafer fab process: BP STD LINEAR
产品技术
产品技术
等效器件小时
平均故障间隔时间/平均无故障时间(按小时计算)
FITS
BP STD LINEAR
10
12120914040
More Details
Re-calculate Data
Data is based on the following assumptions.
Note: The temperature and confidence level may be adjusted to your requirements.
Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)