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UC3843D8 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
稳压芯片
封装:
SOIC-8
描述:
TEXAS INSTRUMENTS UC3843D8 控制器, PWM, 25V-12V电源, 450 kHz, 5V/1A输出, SOIC-8
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引脚图在P3P4P5P12Hot
典型应用电路图在P21P22
原理图在P11P12P14P15P17P18P22
封装尺寸在P37P38P39P40P41P42P43P45P46
标记信息在P37P38P39P40P41P42P43P44
封装信息在P36P37P38P39P40P41P42P43P44P45P46
技术参数、封装参数在P6
应用领域在P1P3P44P56
电气规格在P7P8
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UC3843D8数据手册
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VIN
UC2843
VCC
VREF
RT/CT
GROUND COMP
VFB
ISENSE
OUTPUT
Copyright © 2016, Texas Instruments Incorporated
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
UC1842
,
UC2842
,
UC3842
,
UC1843
,
UC2843
,
UC3843
UC1844
,
UC2844
,
UC3844
,
UC1845
,
UC2845
,
UC3845
SLUS223D –APRIL 1997–REVISED AUGUST 2016
UCx84x Current-Mode PWM Controllers
1 Features
1
1
• Optimized for Off-Line and DC-to-DC Converters
• Low Start-Up Current (< 1 mA)
• Automatic Feedforward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load-Response Characteristics
• Undervoltage Lockout With Hysteresis
• Double-Pulse Suppression
• High-Current Totem-Pole Output
• Internally Trimmed Bandgap Reference
• Up to 500-kHz Operation
• Error Amplifier With Low Output Resistance
2 Applications
• Switching Regulators of Any Polarity
• Transformer-Coupled DC-DC Converters
3 Description
The UCx84x series of control integrated circuits
provide the features that are necessary to implement
off-line or DC-to-DC fixed-frequency current-mode
control schemes, with a minimum number of external
components. The internally implemented circuits
include an undervoltage lockout (UVLO), featuring a
start-up current of less than 1 mA, and a precision
reference trimmed for accuracy at the error amplifier
input. Other internal circuits include logic to ensure
latched operation, a pulse-width modulation (PWM)
comparator that also provides current-limit control,
and a totem-pole output stage that is designed to
source or sink high-peak current. The output stage,
suitable for driving N-channel MOSFETs, is low when
it is in the off state.
The UCx84x family offers a variety of package
options, temperature range options, choice of
maximum duty cycle, and choice of turnon and turnoff
thresholds and hysteresis ranges. Devices with
higher turnon or turnoff hysteresis are ideal choices
for off-line power supplies, while the devices with a
narrower hysteresis range are suited for DC-DC
applications. The UC184x devices are specified for
operation from –55°C to 125°C, the UC284x series is
specified for operation from –40°C to 85°C, and the
UC384x series is specified for operation from 0°C to
70°C.
Device Information
(1)
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
UC184x
CDIP (8) 9.60 mm × 6.67 mm
LCCC (20) 8.89 mm × 8.89 mm
CFP (8) 9.21 mm × 5.97 mm
UC284x
SOIC (8) 4.90 mm × 3.91 mm
SOIC (14) 8.65 mm × 3.91 mm
PDIP (8) 9.81 mm × 6.35 mm
UC384x
SOIC (8) 4.90 mm × 3.91 mm
SOIC (14) 8.65 mm × 3.91 mm
PDIP (8) 9.81 mm × 6.35 mm
CFP (8) 9.21 mm × 5.97 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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