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UC3842A-BW の電気的特性と機能

UC3842A-BWのメーカーはFCIです、この部品の機能は「Current Mode PWM Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC3842A-BW
部品説明 Current Mode PWM Controller
メーカ FCI
ロゴ FCI ロゴ 




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UC3842A-BW Datasheet, UC3842A-BW PDF,ピン配置, 機能
UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
DESCRIPTION
The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM
controller. They are specially designed for OFFLine and DC to DC converter applications
with a minimal external components. Internally implemented circuits include a trimmed
PIN
CONNECTION
(TOP VIEW)
oscillator for precise duty cycle control, a temperature compensated reference, high gain
error amplifier, current sensing comparator, and a high current totempole output ideally
suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout
and current limiting.
The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The
corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and
7.6V (off).
The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW
and UC3845A-BW can operate within 50% duty cycle.
The UC384XA-BW has Start-Up Current 0.17mA (typ).
The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier.
FEATURES
Low Start-Up and Operating Current
High Current Totem Pole Output
Undervoltage Lockout With Hysteresis
Operating Frequency Up To 500KHz
BLOCK DIAGRAM
(toggle flip flop used only in UC3844, UC3845)
Absolute Maximum Ratings
Characteristic
Supply Voltage (low impedance
source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Symbol
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Value
30
±1
0.3 to 5.5
10
1
-65 to150
260
Unit
V
A
V
mA
W
oC
oC
1

1 Page





UC3842A-BW pdf, ピン配列
UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
PIN FUNCTION
N FUNCTION
1 COMP
2 VFB
3 ISENSE
4 RT/CT
5 GROUND
6 OUTPUT
7 VCC
8 Vref
DESCRIPTION
This pin is the Error Amplifier output and is made for loop compensation.
This is the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM
uses this information to terminate the output switch conduction.
The oscillator frequency and maximum Output duty cycle are programmed by
connecting resistor RT to Vref and capacitor CT to ground.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1A
are sourced and sink by this pin.
This pin is the positive supply of the integrated circuit.
This is the reference output. It provides charging current for capacitor CT through
resistor RT .
APPLICATION INFORMATION
Figure 1. Error Amp Configuration
Figure 2. Undervoltage Lockout
3


3Pages


UC3842A-BW 電子部品, 半導体
UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
Figure 7. External Clock Synchronization
Figure 8. Soft-Start Circuit
6

6 Page



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部品番号部品説明メーカ
UC3842A-BW

Current Mode PWM Controller

FCI
FCI


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