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PDF LTC6992-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC6992-2 | |
| Descripción | TimerBlox Voltage-Controlled Pulse Width Modulator (PWM) | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
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 Single Resistor Programs Frequency with < 2.4%
Maximum Error
n PWM Duty Cycle Error < 4.5% 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 –40°C to 125°C Operating Temperature Range
n Available in Low Profile (1mm) SOT-23 (ThinSOT™)
and 2mm × 3mm DFN
APPLICATIONS
n LED Dimming Control
n PWM Servo Loops
n High Vibration, High Acceleration Environments
n Portable and Battery-Powered Equipment
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
TimerBlox and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Electrical Specifications Subject to Change
www.DataSheet4U.com
LTC6992-1/-2/-3/-4
TimerBlox
Voltage-Controlled Pulse
Width Modulator (PWM)
DESCRIPTION
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, RSET, programs the LTC6992’s inter-
nal master oscillator frequency. The output frequency
is determined by this master oscillator and an internal
frequency divider, NDIV, programmable to eight settings
from 1 to 16384.
fOUT
=
1MHz
NDIV
•
50kΩ
RSET
,
NDIV
=
1,4,16
…16384
Applying a voltage between 0V and 1V on the MOD pin sets
the duty cycle, according to the following formula:
Duty
Cycle
=
VMOD
0.8 • VSET
−
1
8
≅
VMOD − 100mV
800mV
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
LTC6992-1
LTC6992-2
LTC6992-3
LTC6992-4
PWM DUTY
CYCLE RANGE
0% to 100%
5% to 95%
0% to 95%
5% to 100%
OUTPUT DUTY CYCLE LIMITS
MIN MAX
GND V+
GND
V+
TYPICAL APPLICATION
1MHz Pulse Width Modulator
ANALOG PWM
DUTY CYCLE
CONTROL
(0V TO 1V)
MOD OUT
LTC6992
GND V+
SET
RSET
50k
DIV
6992 TA01a
V+
C1
0.1μF
MOD
0.5V/DIV
OUT
1V/DIV
2μs/DIV
6992 TA01b
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LTC6992-1/LTC6992-2/
www.DataSheet4U.com
LTC6992-3/LTC6992-4
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, VMOD = 0V to VSET,
DIVCODE = 0 to 15 (NDIV = 1 to 16,384), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise noted.
SYMBOL
tr
PARAMETER
Output Rise Time (Note 8)
tf Output Fall Time (Note 8)
CONDITIONS
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
MIN TYP MAX UNITS
1.1 ns
1.7 ns
2.7 ns
1.0 ns
1.6 ns
2.4 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC6992C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 3: The LTC6992C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6992C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but it is not tested or
QA sampled at these temperatures. The LTC6992I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6992H is guaranteed
to meet specified performance from –40°C to 125°C.
Note 4: Frequency accuracy is defined as the deviation from the fOUT
equation, assuming RSET is used to program the frequency.
Note 5: See Operation section, Table 1 and Figure 2 for a full explanation
of how the DIV pin voltage selects the value of DIVCODE.
Note 6: Duty cycle setting time is the is the amount of time required for
the output to settle within ±1% of the final duty cycle after a ±10% change
in the setting (±80mV step in VMOD).
Note 7: To conform to the Logic IC Standard, current out of a pin is
arbitrarily given a negative value.
Note 8: Output rise and fall times are measured between the 10% and the
90% power supply levels with 5pF output load. These specifications are
based on characterization.
Note 9: Long term drift on silicon oscillators is primarily due to the
movement of ions and impurities within the silicon and is tested at 30°C
under otherwise nominal operating conditions. Long term drift is specified
as ppm/√kHr due to the typically non-linear nature of the drift. To calculate
drift for a set time period, translate that time into thousands of hours, take
the square root and multiply by the typical drift number. For instance, a
year is 8.77kHr and would yield a drift of 888ppm at 300ppm/√kHr. Drift
without power applied to the device may be approximated as 1/10th of the
drift with power, or 30ppm/√kHr for a 300ppm/√kHr device.
Note 10: Frequency change settling time is the amount of time required
for the output to settle within ±1% of the final frequency after a 0.5x or 2x
change in ISET.
Note 11: Jitter is the ratio of the peak-to-peak deviation of the period to
the mean of the period. This specification is based on characterization and
is not 100% tested.
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LTC6992-1/LTC6992-2/
www.DataSheet4U.com
LTC6992-3/LTC6992-4
TYPICAL PERFORMANCE CHARACTERISTICS V+ = 3.3V, RSET = 200k, and TA = 25°C, unless
otherwise noted.
Supply Current vs Supply Voltage
400
LTC6992-2
350
RSET = 50k, ÷4
300
RSET = 50k, ÷1
250 RSET = 50k, ÷16
200 RSET = 100k, ÷1
150
100 RSET = 800k, ÷1
50
0
23456
SUPPLY VOLTAGE (V)
6992 G44
Supply Current vs Temperature
400
350 5.0V, RSET = 50k, ÷1
300 5.0V, RSET = 50k, ÷16
250 2.5V, RSET = 50k, ÷1
200
150
5.0V, RSET = 800k, ÷1
100
2.5V, RSET = 800k, ÷1
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
6992 G45
Jitter vs Frequency
2.0
PEAK-TO-PEAK PERIOD
1.8 DEVIATION MEASURED
1.6
OVER 30s INTERVALS
VMOD/VSET = 0.5
1.4
÷1, V+ = 5V
1.2 ÷1, V+ = 2.5V
1.0
0.8
0.6 ÷4, V+ = 5V
÷4, V+ = 2.5V
0.4
0.2 ÷64 ÷16
0
0.01
0.1 1 10 100
FREQUENCY (kHz)
1000
6992 G46
Supply Current vs Frequency, 5V
400 V+ = 5V
350
÷4
300
÷16,384
250
200
150
÷1
100
50
0
0.001 0.01
0.1 1 10
FREQUENCY (kHz)
100 1000
6992 G47
Supply Current vs Frequency, 2.5V
400 V+ = 2.5V
350
300
250
÷16,384
200
÷4
150
÷1
100
50
0
0.001 0.01
0.1 1 10
FREQUENCY (kHz)
100 1000
6992 G48
Output Resistance
vs Supply Voltage
50
45
40
35
OUTPUT SOURCING CURRENT
30
25
20
15 OUTPUT SINKING CURRENT
10
5
0
23456
SUPPLY VOLTAGE (V)
6992 G50
Rise and Fall Time
vs Supply Voltage
3.0
2.5
CLOAD = 5pF
2.0
tRISE
1.5
tFALL
1.0
0.5
0
23456
SUPPLY VOLTAGE (V)
6992 G51
Typical ISET Current Limit vs V+
1000
SET PIN SHORTED TO GND
800
600
400
200
0
23456
SUPPLY VOLTAGE (V)
6992 G52
69921234p
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC6992-2.PDF ] | |
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