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參數資料
| 型號： | LT1508IS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.5 A POWER FACTOR CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 232K |
| 代理商： | LT1508IS |
1
LT1508
Power Factor and PWM
Controller (Voltage Mode)
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
PFC and PWM Single Chip Solution
s
Synchronized Operation up to 300kHz
s
99% Power Factor Over 20:1 Load Current Range
s
Voltage Mode PWM
s
Instantaneous Overvoltage Protection
s
Dedicated Overvoltage Protection (OVP Pin)
s
Minimal Line Current Dead Zone
s
Typical 250
A Start-Up Supply Current
s
Line Switching Noise Filter
s
Low Quiescent Current: 13mA
s
Fast 1.5A Peak Current Gate Drivers
s
Separate Soft Start Control
FEATURES
DESCRIPTION
U
APPLICATIONS
U
s
Universal Power Factor Corrected Power Supplies
and Preregulators
The LT
1508 is a complete solution for universal off-line
switching power supplies utilizing active power factor
correction. The PFC section is identical to the LT1248 PFC
controller except the EN/SYNC pin is removed because
PFC and PWM are synchronized internally.
The voltage mode PWM section (LT1509 is the current
mode counterpart) contains all the primary side functions
to convert the PFC preregulated high voltage output to an
isolated low voltage output. The PWM duty cycle is
internally limited to 47% (maximum 50%) to prevent
transformer saturation. PWM soft start begins when the
PFC output reaches the preset voltage. In the event of brief
line loss, PWM will be shut off when the PFC output
voltage drops below 73% of the preset value.
–
+
–
+
–
11
16
13
+
–
+
–
+
IM =
IA2IB
200
A2
4
15
19
18
1508 BD
VSENSE
7.5V
7.9V
VCC
16V TO 10V
14
A
14
A
7
A
7V TO
4.7V
–
+
EA
CA
–
+
CL
2.2V
M1
IA
IM
IB
25k
1V
R
2R
14
VAOUT
10
VREF
7.5V
VREF
12
MOUT
8
ISENSE
7
CAOUT
6
CSET
RSET
ILIM
VC
50
A
RUN
R
Q
S
RQ
R
OSC
55%
DELAY
200ns
BLANKING
PKLIM
5
GND1
3
VCC
17
GTDR1
16V
1
GND2
2
GTDR2
20
IAC
9
OVP
SS1
SS2
PWMOK
0.7V
+
–
+
–
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE
AFTER PFC PULSE
–
+
–
+
BLOCK DIAGRAM
W
NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT1508ISW | 功能描述:IC PWM/POWER FACTOR CNTRLR20SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - PFC（功率因數修正） 系列:- 產品培訓模塊:GreenChip Synchronous Rectification Control Family of ICs 標準包裝:1 系列:- 模式:間歇導電（DCM） 頻率 - 開關:- 電流 - 啟動:- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:Digi-Reel® 其它名稱:568-5348-6 |
| LT1509 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Factor and PWM Controller |
| LT15090 | 制造商:Cooper Crouse-Hinds 功能描述: 制造商:CROUSE-HINDS/COOPER 功能描述: |
| LT1509CN | 功能描述:IC PFC CTRLR AVERAGE CURR 20DIP RoHS:否 類別:集成電路 (IC) >> PMIC - PFC（功率因數修正） 系列:- 產品培訓模塊:GreenChip Synchronous Rectification Control Family of ICs 標準包裝:1 系列:- 模式:間歇導電（DCM） 頻率 - 開關:- 電流 - 啟動:- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:Digi-Reel® 其它名稱:568-5348-6 |
| LT1509CN#PBF | 功能描述:IC PFC CTRLR AVERAGE CURR 20DIP RoHS:是 類別:集成電路 (IC) >> PMIC - PFC（功率因數修正） 系列:- 產品培訓模塊:GreenChip Synchronous Rectification Control Family of ICs 標準包裝:1 系列:- 模式:間歇導電（DCM） 頻率 - 開關:- 電流 - 啟動:- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:Digi-Reel® 其它名稱:568-5348-6 |
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