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參數資料
| 型號： | DRV102T |
| 英文描述： | PWM SOLENOID/VALVE DRIVER |
| 中文描述： | 脈寬調制電磁/閥驅動 |
| 文件頁數： | 9/19頁 |
| 文件大?。?/td> | 253K |
| 代理商： | DRV102T |
9
DRV102
CONSTANT OUTPUT DURATION
(Delay Time to PWM Mode)
C
D
3
μ
s
15
μ
s
97
μ
s
0.97ms
97ms
Pin Connected to 5V
Pin Open
100pF
1nF
0.1
μ
F
APPLICATIONS INFORMATION
POWER SUPPLY
The DRV102 operates from a single +8V to +60V supply
with excellent performance. Most behavior remains un-
changed throughout the full operating voltage range. Param-
eters which vary significantly with operating voltage are
shown in the Typical Performance Curves.
CONNECTIONS TO LOAD
The PWM switching voltage and currents can cause electro-
magnetic radiation. Proper physical layout of the load cur-
rent will help minimize radiation. Load current flows from
the DRV102 output terminal to the load and returns through
the ground return path. This current path forms a loop. To
minimize radiation, make the area of the enclosed loop as
small as possible. Twisted pair leading to the load is excel-
lent. If the ground return current must flow through a chassis
ground, route the output current line directly over the chassis
surface in the most direct path to the load.
FLYBACK DIODE LOCATION
Physical location of the flyback diode may affect electro-
magnetic radiation. With most solenoid loads, inductance is
large enough that load current is virtually constant during
PWM operation. When the switching transistor is off, load
current flows though the flyback diode. If the flyback diode
is located near the DRV102 (Figure 2a), the current flowing
in long lines to the load is virtually constant. If the flyback
diode is, instead, located directly across the load (Figure 2b),
pulses of current must flow from the DRV102 to the distant
load. While theory seems to favor placing the diode at the
DRV102 output (constant current in the long lines), indi-
TABLE I. Delay Adjust Pin Connections.
vidual situations may defy logic; if one location seems to
create noise problems, try the other.
SERIES DIODE FOR INDUCTIVE LOADS
An additional bias diode, located in series with the output, is
required when driving inductive loads. Any silicon diode,
such as the 1N4002, appropriately rated for current will
work. The diode biases the emitter of the internal power
device such that it can be fully shut off during the “off”
portion of the PWM cycle. Note that the voltage at the load
drops below ground due to the flyback diode. If it is not used,
apparent leakage current can rise to hundreds of milliamps,
resulting in unpredictable operation and thermal shutdown.
ADJUSTABLE INITIAL 100% DUTY CYCLE
A unique feature of the DRV102 is its ability to provide an
initial constant dc output (100% duty cycle) and then switch
to PWM mode to save power. This function is particularly
useful when driving solenoids which have a much higher
pull-in current requirement than hold current requirement.
The duration of this constant dc output (before PWM output
begins) can be externally and independently controlled with
a capacitor connected from Delay Adjust (pin 2) to ground
according to the following equation:
Delay Time
≈
C
D
10
6
(time in seconds, C
D
in Farads)
Leaving the Delay Adjust pin open results in a constant
output time of approximately 15
μ
s. The duration of this
initial output can be reduced to less than 3
μ
s by connecting
the pin to 5V. Table I provides examples of desired “delay”
times (constant output before PWM mode) and the appropri-
ate capacitor values or pin connection.
FIGURE 2. Location of External Flyback Diode.
The internal Delay Adjust circuitry is composed of a 3
μ
A
current source and a 3V comparator as shown in Figure 3.
Thus, when the pin voltage is less than 3V, the output device
is 100% on (dc output mode).
FIGURE 3. Simplified Circuit Model of the Delay Adjust Pin.
DRV102
Load
V
S
6
Out
5
4
2a) Flyback Diode Near DRV102
DRV102
Load
V
S
6
Out
5
4
2b) Flyback Diode Near Load
3
μ
A
2
C
D
V
S
3V Reference
Comparator
Delay Adjust
DRV102
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相關代理商/技術參數 |
參數描述 |
|---|---|
| DRV102T | 制造商:BURR-BROWN 功能描述:SOLENOID/VALVE DRIVER PWM TO-220-7 |
| DRV102TG3 | 功能描述:馬達/運動/點火控制器和驅動器 PWM Solenoid/Valve Driver RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| DRV103 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PWM LOW-SIDE DRIVER (1.5A and 3A) for Solenoids, Coils, Valves, Heaters, and Lamps |
| DRV103H | 功能描述:馬達/運動/點火控制器和驅動器 Low Side Driver 1.5A/3A RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| DRV103H | 制造商:Texas Instruments 功能描述:PWM LOW SIDE DRIVER 1.5A/3A HSOP8 |
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