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LT124XMJ8 Datasheet

  • LT124XMJ8

  • High Speed Current Mode Pulse Width Modulators

  • 16頁

  • LINER

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LT1241 Series
High Speed Current Mode
Pulse Width Modulators
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
Low Start-Up Current: < 250碌A(chǔ)
50ns Current Sense Delay
Current Mode Operation: To 500kHz
Pin Compatible with UC1842 Series
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
High Level Output Clamp: 18V
Current Sense Leading Edge Blanking
APPLICATI
s
s
S
Off-Line Converters
DC/DC Converters
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT
廬
1241 series devices are 8-pin, fixed frequency,
current mode, pulse width modulators. They are improved
plug compatible versions of the industry standard UC1842
series. These devices have both improved speed and
lower quiescent current. The LT1241 series is optimized
for off-line and DC/DC converter applications. They con-
tain a temperature-compensated reference, high gain er-
ror amplifier, current sensing comparator 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 current spikes in
the output stage have been eliminated, making 500kHz
operation practical. Several new features have been incor-
porated. Leading edge blanking has been added to the
current sense comparator. 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 undervoltage lockout.
BLOCK DIAGRA
REFERENCE ENABLE
5V REF
MAIN BIAS
REFERENCE PULL-DOWN
R
T
/C
T
4
OSCILLATOR
T
S
R
6
OUTPUT
COMP
FB
1
1mA
2
2.5V
5.6V
1V
鈥?/div>
+
2R
鈥?/div>
R
BLANKING
+
1.5V
I
SENSE
3
U
UV
LOCKOUT
8
7
V
REF
V
CC
OUTPUT
PULL-DOWN
5
18V
GND
W
UO
+
鈥?/div>
1241 BD01
1

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