Efficient Solenoid Driver

SENSITRON
SEMICONDUCTOR
SCP-6212 / SCP-6212ADJ
DATASHEET SCP-6212 Preliminary
SCP-6212/ SCP-6212ADJ 1.25A EFFICIENT SOLENOID DRIVER
FEATURES
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Input voltage range 21V – 40V (12V – 40V
for SCP-6212ADJ)
1.25A drive capability
At Vin = 28V, Iload = 1.25A
o Vout = 28V nominal for 1.2 seconds upon
command
o Vout = 15V nominal after 1.2 seconds
Adjustable time delay and hold voltage
(SCP-6212ADJ)
Integrated catch diode for inductive
kickback
0V – 5V on/off control
PWM operating frequency 2.2MHz
Short circuit protection
Low-profile surface mount package
The SCP-6212 is designed to drive solenoids and
relays in an efficient manner, taking advantage of the
characteristic of differing driving and holding currents.
For 1.2 seconds upon receiving a command signal, or
for an adjustable time on the SCP-6212ADJ, the
IN
DC-DC
CONVERTER
PASS
ELEMENT
CONTROL
DELAY OFF
device behaves as a traditional high-side
driver, passing the input voltage to the
output terminals. After the solenoid has
engaged, plus some time margin, the
delivered current is reduced by switching
the output from the pass element to a dcdc converter to fix the output at 15V, or to
another adjustable voltage on the SCP6212ADJ. The driver is controlled by a
5V signal. A block diagram is shown in
Figure 1. Short-circuit protection is
employed for each of the two operating
states. Delay-time to DC-DC operation
and DC-DC output voltage on the SCP6212ADJ are programmed with external
resistors, shown in Figure 4.
ABSOLUTE MAXIMUM RATINGS
OUT
Vin .................................................40V
Vcmd ................................-0.2V to 12V
Output Current (drive) .............1.25A
Output Current (hold) ................0.5A
Storage and Operating Temperature
........................................-400C to 850C
Figure 1. Block diagram
• 221 West Industry Court • Deer Park, NY 11729-4681 • Phone (631) 586-7600 • Fax (631) 242-9798 •
• World Wide Web Site - http://www.sensitron.com • E-Mail Address - [email protected] •
1
SENSITRON
SEMICONDUCTOR
SCP-6212 / SCP-6212ADJ
DATASHEET SCP-6212 Preliminary
ELECTRICAL CHARACTERISTICS
TA = 250C unless otherwise specified.
PARAMETER
CONDITIONS
turn-on threshold
turn-off threshold
driving current voltage drop
Iout = 0.25A
(Vin - Vout)
Iout = 0.50A
Iout = 1.25A
time delay to hold-current mode VCMD = 5.0V
efficiency in hold-current mode
Iout = 0.25A
1
PWM frequency
MIN. TYP. MAX.
1.3
1.8
2.3
1.4
1.9
2.4
0.25 0.40
0.45 0.60
0.85 1.00
1.0
1.2
1.4
85
89
2.2
1
UNITS
V
V
V
V
V
s
%
MHz
PWM frequency is provided for information only, for the purpose of general electromagnetic interference consideration. The output is a smooth DC
voltage in both driving and holding modes.
1 Vin
2 Vin
TIME DELAY VS. COMMAND VOLTAGE
Vout 8
Vout 7
2.0
1.8
SCP-XXXX
TIME DELAY (s)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
3 COMMAND
4 COMMAND
GND 6
GND 5
Figure 2. SCP-6212 pinout
0.2
0.0
2
3
4
5
6
7
8
COMMAND VOLTAGE (V)
Figure 3.
• 221 West Industry Court • Deer Park, NY 11729-4681 • Phone (631) 586-7600 • Fax (631) 242-9798 •
• World Wide Web Site - http://www.sensitron.com • E-Mail Address - [email protected] •
2
SENSITRON
SEMICONDUCTOR
SCP-6212 / SCP-6212ADJ
DATASHEET SCP-6212 Preliminary
1 Vin
2 Vin
Vout 8
Vout 7
SCP-XXXXADJ
3 TIME SET
4 COMMAND
Vout SET 6
GND 5
Rv
Rt
Figure 4. SCP-6212ADJ pinout and external program resistors
Resistor selection Rt for time delay from command signal to output voltage reduction is made by
setting Rt ≈ 6667t, where t is time in seconds. Resistor selection Rv for output voltage selection is
made by Rv ≈ 144000/(Vout-0.49).
Figure 5. Turn-on, showing 28V to 15V transition.
Figure 6. Output under short-circuit conditions.
• 221 West Industry Court • Deer Park, NY 11729-4681 • Phone (631) 586-7600 • Fax (631) 242-9798 •
• World Wide Web Site - http://www.sensitron.com • E-Mail Address - [email protected] •
3
SENSITRON
SEMICONDUCTOR
SCP-6212 / SCP-6212ADJ
DATASHEET SCP-6212 Preliminary
Figure 7. Mechanical outline
• 221 West Industry Court • Deer Park, NY 11729-4681 • Phone (631) 586-7600 • Fax (631) 242-9798 •
• World Wide Web Site - http://www.sensitron.com • E-Mail Address - [email protected] •
4
SENSITRON
SEMICONDUCTOR
SCP-6212 / SCP-6212ADJ
DATASHEET SCP-6212 Preliminary
DISCLAIMER:
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characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the
datasheet(s).
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• 221 West Industry Court • Deer Park, NY 11729-4681 • Phone (631) 586-7600 • Fax (631) 242-9798 •
• World Wide Web Site - http://www.sensitron.com • E-Mail Address - [email protected] •
5
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