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LT1247CS8 Datasheet

  • LT1247CS8

  • 1MHz Off-Line Current Mode PWM and DC/DC Converter

  • 12頁

  • LINER

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LT1246/LT1247
1MHz Off-Line
Current Mode PWM
and DC/DC Converter
DESCRIPTIO
The LT
廬
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碌A(chǔ). 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
Current Mode Operation to 1MHz
30ns Current Sense Delay
< 250碌A(chǔ) Low Start-Up Current
Current Sense Leading Edge Blanking
Pin Compatible with UC1842
Undervoltage Lockout with Hysteresis
No Cross-Conduction Current
Trimmed Bandgap Reference
1A Totem Pole Output
Trimmed Oscillator Frequency and Sink Current
Active Pull-Down on Reference and Output During
Undervoltage Lockout
18V High Level Output Clamp
APPLICATI
s
s
S
Off-Line Converters
DC/DC Converters
Start-Up
Threshold
16V
8.4V
Minimum
Operating
Voltage
10V
7.6V
Maximum
Duty Cycle
100%
100%
Device
LT1246
LT1247
Replaces
UC1842
UC1843
BLOCK DIAGRA
REFERENCE ENABLE
5V REF
MAIN BIAS
REFERENCE PULLDOWN
OUTPUT
PULLDOWN
R
T
/C
T
COMPENSATION
4
1
1mA
5.6V
OSCILLATOR
S
R
1V
2R
R
5
GND
6
OUTPUT
FEEDBACK
2
2.5V
鈥?/div>
+
鈥?/div>
+
BLANKING
I
SENSE
3
U
W
UO
UV
LOCKOUT
8
7
V
REF
V
CC
18V
+
1.5V
鈥?/div>
LT1246 鈥?BD01
1

LT1247CS8 產(chǎn)品屬性

  • LT1246/47

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 1MHz

  • 100%

  • 8.2 V ~ 25 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 是

  • 0°C ~ 100°C

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

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