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參數(shù)資料
| 型號(hào)： | 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)： | 10/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | UC2845 |
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
10
Figure 20. Adjustable Reduction of Clamp Level
Figure 21. SoftStart Circuit
Figure 22. Adjustable Buffered Reduction of
Clamp Level with SoftStart
Figure 23. Current Sensing Power MOSFET
Virtually lossless current sensing can be achieved with the implement of a SENSEFET
power switch. For proper operation during over current conditions, a reduction of the
I
pk(max)
clamp level must be implemented. Refer to Figures 20 and 22.
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
Q1
R
S
3(5)
5(8)
1.0V
R
Comp/Latch
5.0V
ref
V
Clamp
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
R
1
R
2
R
1
+ R
2
R
2
R
1
V
Clamp
1.67
+ 1
+ 0.33 x 10
3
I
pk(max)
≈
V
Clamp
R
S
Where: 0
≤
V
Clamp
≤
1.0 V
R2
R1
1.0mA
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
1.0V
R
5.0V
ref
+
+
C
t
SoftStart
3600C in F
1.0mA
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
Q1
R
S
3(5)
5(8)
1.0V
R
Comp/Latch
5.0V
ref
V
Clamp
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
MPSA63
R1
R2
C
t
Softstart
= In
1
V
C
R
1
R
2
R
1
+ R
2
C
R
2
R
1
V
Clamp
1.67
+ 1
I
pk(max)
≈
V
Clamp
R
S
Where: 0
≤
V
Clamp
≤
1.0 V
1.0mA
3V
Clamp
R
S
1/4 W
(5)
(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
(11)
(10)
+
+
+
(12)
+
Power Ground
To Input Source
Return
V
Pin
5
≈
If: SENSEFET = MTP10N10M
R
S
= 200
Then: V
pin
5 = 0.075 I
pk
SENSEFET
R
S
I
pk
r
DS(on)
r
DM(on)
+ R
S
M
G
D
S
K
Control CIrcuitry
Ground:
To Pin (9)
+ 0.33 x 10
3
R
1
R
2
R
1
+ R
2
Figure 24. Current Waveform Spike Suppression
The addition of the RC filter will eliminate
instability caused by the leading edge spike on
the current waveform.
Q1
R
S
3(5)
5(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
R
C
T
1
T
T
T
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(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 |
| 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(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 |
| UC2845AD1013TR | 制造商:STMicroelectronics 功能描述: |
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