LIN D O C # : 1840
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET's, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. Available options for this family of products, such as start-up voltage hysteresis and duty cycle, are summarized below in the Available Options section. The UC184xA family of control ICs is also available in 14-pin SOIC package which makes the Power Output Stage Collector and Ground pins available.
K E Y F E AT U R E S
s LOW START-UP CURRENT. (0.5mA max.) s TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) p OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. p AUTOMATIC FEED FORWARD COMPENSATION. p PULSE-BY-PULSE CURRENT LIMITING. p ENHANCED LOAD RESPONSE CHARACTERISTICS. p UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. p DOUBLE PULSE SUPPRESSION. p HIGH-CURRENT TOTEM POLE OUTPUT. p INTERNALLY TRIMMED BANDGAP REFERENCE. p 500KHz OPERATION. p LOW RO ERROR AMPLIFIER.
PRODUCT HIGHLIGHT
COMPARISON
OF
U C384 X A
VS.
SG384 X D ISCHARGE C URRENT
A P P L I C AT I O N S SG384x
Max. Limit
UC384xA
SG384x
Min. Limit
TA=25°C
s ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. s DC-DC BUCK OR BOOST CONVERTERS. s LOW COST DC MOTOR CONTROL.
A
VAILABLE
O
PTIONS
Part # UCx842A UCx843A
7.5 7.8 8.3 Mean 8.8 9.3
Start-Up Hysteresis Max. Duty Voltage Cycle 16V 8.4V 16V 8.4V 6V 0.8V 6V 0.8V
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免费人工找货 - 国内价格 香港价格
- 1+ 6.5538 1+ 0.791
- 10+ 4.2098 10+ 0.5081
- 100+ 3.4402 100+ 0.4152
- 500+ 3.3002 500+ 0.3983
- 1000+ 3.172 1000+ 0.3829
- 2500+ 3.0437 2500+ 0.3674
- 5000+ 2.8688 5000+ 0.3463
- 10000+ 2.7521 10000+ 0.3322
- 25000+ 2.7055 25000+ 0.3266
- 国内价格 香港价格
- 1+ 9.0727 1+ 1.095
- 10+ 5.9124 10+ 0.7136
- 100+ 4.8745 100+ 0.5883
- 500+ 4.688 500+ 0.5658
- 1000+ 4.513 1000+ 0.5447
- 2500+ 4.3381 2500+ 0.5236
- 5000+ 4.1282 5000+ 0.4983
- 10000+ 3.9766 10000+ 0.48
- 25000+ 3.8367 25000+ 0.4631
- 国内价格 香港价格
- 1+ 11.4983 1+ 1.3877
- 10+ 7.2069 10+ 0.8698
- 100+ 4.8745 100+ 0.5883
- 500+ 4.0349 500+ 0.487
- 1000+ 3.5218 1000+ 0.4251
- 2500+ 3.3702 2500+ 0.4068
- 5000+ 3.1486 5000+ 0.38
- 10000+ 3.0204 10000+ 0.3646
- 25000+ 2.9737 25000+ 0.3589
- 国内价格
- 1+ 3.2319 1+ 0
- 10+ 2.9833 10+ 0
- 100+ 2.7347 100+ 0
- 1000+ 2.4861 1000+ 0
- 国内价格
- 1+ 8.81581 1+ 0
- 5+ 7.90548 5+ 0
- 17+ 6.62383 17+ 0
- 46+ 6.25252 46+ 0
- 75+ 6.02493 75+ 0
- 国内价格
- 1+ 10.80416 1+ 0
- 5+ 9.51053 5+ 0
- 16+ 6.9712 16+ 0
- 44+ 6.59988 44+ 0
- 250+ 6.33636 250+ 0
- 国内价格
- 5+ 0.79694 5+ 0
- 50+ 0.62586 50+ 0
- 150+ 0.54033 150+ 0
- 500+ 0.47618 500+ 0
- 2000+ 0.42488 2000+ 0
- 4000+ 0.39917 4000+ 0
- 国内价格
- 5+ 1.25551 5+ 0
- 50+ 1.2274 50+ 0
- 150+ 1.20873 150+ 0
- 500+ 1.18996 500+ 0
- 国内价格
- 5+ 2.344 5+ 0
- 50+ 1.85173 50+ 0
- 150+ 1.64068 150+ 0
- 500+ 1.37751 500+ 0
- 2500+ 1.26023 2500+ 0
- 5000+ 1.18996 5000+ 0
- 国内价格
- 1+ 5.62994 1+ 0
- 10+ 4.58212 10+ 0
- 30+ 4.05821 30+ 0
- 100+ 3.5343 100+ 0
- 500+ 3.11019 500+ 0
- 1000+ 2.95218 1000+ 0