參數(shù)資料
型號(hào)： LT1247IJ8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8
封裝： CERAMIC, DIP-8
文件頁數(shù)： 1/2頁
文件大?。?/td> 141K
代理商： LT1247IJ8
Pulsewidth Modulator Controllers for
Off-Line and DC/DC Converters – InfoCard 6
Fast Output Rise and Fall Times
with clean edges give better high
frequency switching performance.
FET switches can be turned ON and
OFF efficiently and quickly.
Low Output Cross-Conduction means
LOWER SUPPLY CURRENT draw at
higher switching frequencies. Switch-
ing at higher than 200kHz is now
practical and more efficient.
Rev D 0496
, LTC and LT are registered trademarks of Linear Technology Corporation.
OUTPUT
CROSS-
CONDUCTION
CURRENT
20mA/DIV
OUTPUT
VOLTAGE
5V/DIV
TIME 50ns/DIV
OUTPUT
VOLTAGE
5V/DIV
CURRENT
SENSE
INPUT
1V/DIV
TIME 50ns/DIV
VCC = 15V
CL = 15pF
VCC = 15V
CL = 1nF
LT1241–LT1245
Output Cross-Conduction Current
OUTPUT
VOLTAGE
Short Current Sense Delay means
faster reaction to output overload
conditions. Magnetics and passive
components do not need to be
oversized.
VCC = 15V
CL = 1nF
s
Universal Input Off-Line PFC and PWM Single Chip Solution
s
Current Mode PWM (LT
1509)
s
Voltage Mode PWM (LT1508)
s
Internally Synchronized Operation Up to 300kHz
s
99% Power Factor Over 20:1 Load Current Range
s
Instantaneous Overvoltage Protection
s
PWM Soft Start After PFC Output Reaches Threshold Voltage
s
20-Lead PDIP and Wide SO Packages
LT1508/LT1509 Combined Power Factor Correction
Controller/PWM Controller
1
2
3
4
5
6
7
8
9
10
TOP VIEW
SW PACKAGE
20-LEAD PLASTIC SO WIDE
N PACKAGE
20-LEAD PDIP
20
19
18
17
16
15
14
13
12
11
GTDR1
GND2
GND1
CSET
PKLIM
CAOUT
ISENSE
MOUT
IAC
VAOUT
GTDR2
VC
VCC
SS1
RSET
VSENSE
SS2
VREF
OVP
ILIM (LT1508)
RAMP (LT1509)
8
7
6
5
4
3
2
1
COMP
FB
ISENSE
RT/CT
LT1241 IC 02
OUTPUT
VCC
VREF
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SOIC
N8 PACKAGE
8-LEAD PLASTIC DIP
J8 PACKAGE
8-LEAD CERAMIC DIP
GND
s
Low Start-Up Current (<250
A)
s
50ns Current Sense Delay
s
Current Mode Operation to 1MHz
s
Current Sense Leading Edge Blanking
s
Pin Compatible with UC1842/UC3842 Series
s
No Cross-Conduction Current
s
1A Totem Pole Output
LT1241–LT1246 Series Key Features
s Trimmed Oscillator Frequency and Sink Current
s Active Pull-Down on Reference and Output
During Undervoltage Lockout
s High Level Output Clamp (18V)
s Industrial Temperature Range Available
(– 40
°C to 85°C)
START-UP
OPERATING
MAX
BLANKING
SUPPLY CURRENT
PART
THRESHOLD (TYP)
VCC (TYP)
DUTY CYCLE
SWITCH FREQ.*
TIME (TYP)
(mA) (MAX)
LT1241
9.6V
7.6V
50%
500kHz
100ns
10
LT1242
16V
10V
100%
500kHz
100ns
10
LT1243
8.4V
7.6V
100%
500kHz
100ns
10
LT1244
16V
10V
50%
500kHz
100ns
10
LT1245
8.4V
7.6V
50%
500kHz
100ns
10
LT1246
16V
10V
100%
1MHz
70ns
20
LT1247
8.4V
7.6V
100%
1MHz
70ns
20
*Recommended Maximum Determined by Rise/Fall Times at 1000pF Loads
LTC High Speed
PWM Controller
Family
TIME 50ns/DIV
LT1241–LT1245
Current Sense Delay
LT1241–LT1245
Output Rise and Fall Time
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7417 (408) 432-1900 www.linear-tech.com Literature Only: 1-800-4-LINEAR
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