參數(shù)資料
型號(hào)： UC2843BDR2
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 296K
代理商： UC2843BDR2
Semiconductor Components Industries, LLC, 2001
December, 2001 – Rev. 3
1
Publication Order Number:
UC3842B/D
UC3842B, UC3843B,
UC2842B, UC2843B,
NCV3843BV
High Performance
Current Mode Controllers
The UC3842B, UC3843B 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 a trimmed oscillator for precise duty cycle
control, 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, programmable output deadtime, and a latch for single
pulse metering.
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 UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off–line converters. The UCX843B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Latching PWM for Cycle–By–Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Figure 1. Simplified Block Diagram
5.0V
Reference
Latching
PWM
V
CC
Undervoltage
Lockout
Oscillator
Error
Amplifier
7(12)
V
C
7(11)
Output
6(10)
Power
Ground
5(8)
3(5)
Current
Sense
Input
V
ref
8(14)
4(7)
2(3)
1(1)
Gnd
5(9)
R
T
/C
T
Voltage
Feedback
Input
R
R
+
-
V
ref
Undervoltage
Lockout
Output
Compensation
Pin numbers in parenthesis are for the D suffix SO-14 package.
V
CC
http://onsemi.com
14
SO–14
D SUFFIX
CASE 751A
1
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 17 of this data sheet.
DEVICE MARKING INFORMATION
1
8
PDIP–8
N SUFFIX
CASE 626
PIN CONNECTIONS
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
R
T
/C
T
Compensation
Voltage Feedback
Current Sense
R
T
/C
T
V
ref
V
CC
Output
Gnd
V
ref
NC
V
CC
V
C
Output
Gnd
Power Ground
(Top View)
8
7
6
5
1
2
3
4
1
2
3
4
14
13
12
11
5
6
7
10
9
8
(Top View)
SO–8
D1 SUFFIX
CASE 751
1
8
相關(guān)PDF資料
PDF描述
UC3842B HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842BVD HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842BVD1 HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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UC3842B HIGH PERFORMANCE CURRENT MODE CONTROLLERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC2843BDR2G 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/96% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2843BG-S08-R 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
UC2843BN 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2843BNG 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/96% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2843D 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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