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參數(shù)資料
| 型號： | LT1247C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1MHz Off-Line Current Mode PWM and DC/DC Converter |
| 中文描述： | 1MHz的離線式電流模式PWM和DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 290K |
| 代理商： | LT1247C |
1
LT1246/LT1247
1MHz Off-Line
Current Mode PWM
and DC/DC Converter
U
ESCRIPTIO
The LT
1246/LT1247 are 8-pin, fixed frequency, current
mode, pulse width modulators. These devices are de-
signed to be improved plug compatible versions of the
industry standard UC1842 PWM circuit. The LT1246/
LT1247 are optimized for off-line and DC/DC converter
applications. They contain a temperature compensated
reference, high gain error amplifier, current sensing com-
parator, and a high current totem pole output stage ideally
suited to driving power MOSFETs. Start-up current has
been reduced to less than 250
μ
A. Cross-conduction cur-
rent spikes in the totem pole output stage have been
eliminated, making 1MHz operation practical. Several new
features have been incorporated. Leading edge blanking
has been added to the current sense comparator. This
minimizes or eliminates the filter that is normally required.
Eliminating this filter allows the current sense loop to
operate with minimum delays. Trims have been added to
the oscillator circuit for both frequency and sink current,
and both of these parameters are tightly specified. The
output stage is clamped to a maximum V
OUT
of 18V in the
on state. The output and the reference output are actively
pulled low during under-voltage lockout.
+
–
+
–
1
2
FEEDBACK
COMPENSATION
2.5V
2R
R
1V
1.5V
–
+
3
I
SENSE
BLANKING
1mA
5.6V
4
R
T
/C
T
OSCILLATOR
R
S
18V
7
V
CC
UV
LOCKOUT
5
GND
6
OUTPUT
8
V
REF
5V REF
MAIN BIAS
REFERENCE PULLDOWN
OUTPUT
PULLDOWN
REFERENCE ENABLE
LT1246 BD01
D
S
FEATURE
U
S
A
O
PPLICATI
I
Current Mode Operation to 1MHz
I
30ns Current Sense Delay
I
< 250
μ
A Low Start-Up Current
I
Current Sense Leading Edge Blanking
I
Pin Compatible with UC1842
I
Undervoltage Lockout with Hysteresis
I
No Cross-Conduction Current
I
Trimmed Bandgap Reference
I
1A Totem Pole Output
I
Trimmed Oscillator Frequency and Sink Current
I
Active Pull-Down on Reference and Output During
Undervoltage Lockout
I
18V High Level Output Clamp
I
Off-Line Converters
I
DC/DC Converters
, LTC and LT are registered trademarks of Linear Technology Corporation.
W
IAGRA
BLOCK
Minimum
Operating
Voltage
10V
7.6V
Start-Up
Threshold
16V
8.4V
Maximum
Duty Cycle
100%
100%
Device
LT1246
LT1247
Replaces
UC1842
UC1843
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1247CN8 | 1MHz Off-Line Current Mode PWM and DC/DC Converter |
| LT1247CS8 | 1MHz Off-Line Current Mode PWM and DC/DC Converter |
| LT1246 | Octal D-Type Transparent Latches with 3-state Outputs 20-PDIP 0 to 70 |
| LT1246CS8 | 1MHz Off-Line Current Mode PWM and DC/DC Converter |
| LT1247 | Octal D-Type Transparent Latches with 3-state Outputs 20-PDIP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1247CN8 | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1247CN8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1247CS8 | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1247CS8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1247CS8#TR | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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