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LTC6992IS6-2#PBF 数据手册 - ADI（亚德诺）
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LTC6992IS6-2#PBF数据手册
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LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
1
69921234fc
Typical applicaTion
DescripTion
TimerBlox:
Voltage-Controlled Pulse
Width Modulator (PWM)
The LTC
®
6992 is a silicon oscillator with an easy-to-use
analog voltage-controlled pulse width modulation (PWM)
capability. The LTC6992 is part of the TimerBlox
®
family
of versatile silicon timing devices.
A single resistor, R
SET
, programs the LTC6992’s inter-
nal master oscillator frequency. The output frequency
is determined by this master oscillator and an internal
frequency divider, N
DIV
, programmable to eight settings
from 1 to 16384.
f
OUT
=
1MHz
N
DIV
•
50kΩ
R
SET
, N
DIV
= 1,4,16 …16384
Applying a voltage between 0V and 1V on the MOD pin
sets the duty cycle.
The four versions differ in their minimum/maximum duty
cycle. Note that a minimum duty cycle limit of 0% or
maximum duty cycle limit of 100% allows oscillations to
stop at the extreme duty cycle settings.
DEVICE NAME PWM DUTY CYCLE RANGE
LTC6992-1 0% to 100%
LTC6992-2 5% to 95%
LTC6992-3 0% to 95%
LTC6992-4 5% to 100%
For easy configuration of the LTC6992, download the
TimerBlox Designer tool at www.linear.com/timerblox.
n
Pulse Width Modulation (PWM) Controlled by
Simple 0V to 1V Analog Input
n
Four Available Options Define Duty Cycle Limits
– Minimum Duty Cycle at 0% or 5%
– Maximum Duty Cycle at 95% or 100%
n
Frequency Range: 3.81Hz to 1MHz
n
Configured with 1 to 3 Resistors
n
<1.7% Maximum Frequency Error
n
PWM Duty Cycle Error <3.7% Maximum
n
Frequency Modulation (VCO) Capability
n
2.25V to 5.5V Single Supply Operation
n
115μA Supply Current at 100kHz
n
500μs Start-Up Time
n
CMOS Output Driver Sources/Sinks 20mA
n
–55°C to 125°C Operating Temperature Range
n
Available in Low Profile (1mm) SOT-23 (ThinSOT™)
and 2mm × 3mm DFN
L, LT, LTC and LTM, Linear Technology, TimerBlox and the Linear logo are registered
trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
FeaTures
applicaTions
n
PWM Servo Loops
n
Heater Control
n
LED Dimming Control
n
High Vibration, High Acceleration Environments
n
Portable and Battery-Powered Equipment
6992 TA01a
LTC6992
MOD
GND
SET
OUT
V
+
DIV
R
SET
50k
3.3V
ANALOG PWM
DUTY CYCLE
CONTROL
(0V TO 1V)
C1
0.1µF
1MHz Pulse Width Modulator
MOD
0.5V/DIV
OUT
1V/DIV
2µs/DIV
6992 TA01b
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