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參數(shù)資料
| 型號： | UC2845 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Current Mode Controllers(高性能電流模式控制器) |
| 中文描述： | 高性能電流模式控制器（高性能電流模式控制器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 354K |
| 代理商： | UC2845 |
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
11
The MCR101 SCR must be selected for a holding of less than 0.5 mA at T
A(min)
.
The simple two transistor circuit can be used in place of the SCR as shown. All
resistors are 10 k.
Figure 25. MOSFET Parasitic Oscillations
Figure 26. Bipolar Transistor Drive
Figure 27. Isolated MOSFET Drive
Figure 28. Latched Shutdown
Figure 29. Error Amplifier Compensation
The totempole output can furnish negative base current for enhanced
transistor turnoff, with the addition of capacitor C
1
.
Error Amp compensation circuit for stabilizing any currentmode topology except
for boost and flyback converters operating with continuous inductor current.
Error Amp compensation circuit for stabilizing currentmode boost and flyback
topologies operating with continuous inductor current.
Series gate resistor R
g
will damp any high frequency parasitic oscillations
caused by the MOSFET input capacitance and any series wiring inductance
in the gatesource circuit.
Q1
R
S
3(5)
5(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
R
g
Q1
R
S
3(5)
5(8)
V
in
6(1)
C
1
I
B
+
0
Base
Charge
Removal
éé
éé
50% DC
25% DC
éé
Q1
3(5)
5(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
N
p
R
C
R
S
N
S
Isolation
Boundary
Waveforms
+
0
+
0
I
pk
=
V
(pin 1)
1.4
3 R
S
N
P
N
S
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
2N
3903
2N
3905
MCR
101
5(9)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
C
I
R
f
R
i
R
d
From V
O
2.5V
5(9)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
C
p
C
I
R
f
From V
O
R
p
R
d
R
i
2.5V
T
R
f
≥
8.8 k
T
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3845 | High Performance Current Mode Controllers(高性能電流模式控制器) |
| UC2845AAY | CURRENT MODE PWM CONTROLLER |
| UC284XA | CURRENT MODE PWM CONTROLLER |
| UC2845AL | |
| UC1842AL | Automotive 8-bit MCU, with up to 32 Kbytes Flash, EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 V to 5.5 V |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC2845A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
| UC2845AAY | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT MODE PWM CONTROLLER |
| UC2845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| UC2845AD1 | 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| UC2845AD1013TR | 制造商:STMicroelectronics 功能描述: |
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