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TDE1747FPT
Interface circuit
September 2006 Rev 1 1/17
TDE1747Interface circuit - relay and lamp-driver
Features Open ground protection High output current Adjustable short-circuit protection to ground Thermal protection with hysteresis to avoid the
intermediate output levels Large supply voltage range: + 8V to +45V Short-circuit protection to VCC
DescriptionThe TDE1747 is a monolithic comparator
designed for high current and high voltage
applications, specifically to drive lamps, relays,
stepping motors.
This device is essentially blow-out proof. Current
limiting is available to limit the peak output current
to safe values.
Adjustment only requires one external resistor. In
addition, thermal shut down is provided to keep
the IC from overheating. If internal dissipation
becomes too high, the driver will shut down to
prevent excessive heating. TDE1747 has an open
ground protection. The output is also protected
from shortcircuits with the positive power supply.
The device operates over a wide range of supply
voltages from standard ± 15V operational
amplifier supplies down to the single +12V or
+24V used for industrial electronic systems. .
Order codes
Contents
TDE17472/17
Contents Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin connections and schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TDE1747 Maximum ratings
3/17
1 Maximum ratings
1.1 Absolute maximum ratings
1.2 Thermal data
Table 1. Absolute maximum ratings 60V, t ≤ 10ms
Table 2. Thermal data
Electrical characteristics TDE1747
4/17
2 Electrical characteristics
TJ = −25 to +85°C, VCC = 8 to 45 V , unless otherwise specified (note 1)
Table 3. Electrical characteristics For operating at high temperature, the TDE1747, must be derated based on a +150°C maximum junction temperature and
junction-ambient thermal resistance of 120°C/W for DIP-8 and 100°C/W for the SO14. The offset voltage given is the maximum value of input voltage required to drive the output voltage within 2V of the ground
or the supply voltage.
TDE1747 Pin connections and schematic diagrams
5/17 Pin connections and schematic diagrams
Figure 1. Pin connections (top views)
Figure 2. Schematic diagram
Pin connections and schematic diagrams TDE1747
6/17
Figure 3. Test circuit
Figure 4. Simplified schematic
TDE1747 Typical characteristics
7/17
4 Typical characteristics
Figure 5. Available output current vs
limiting resistors
Figure 6. Peak short-circuit vs
limiting resistor
Figure 7. Short-circuit current vs
case temperature
Figure 8. Minimum limiting resistor value vs
supply voltage
Typical characteristics TDE1747
8/17
Figure 9. Output current vs
output saturation voltage
Figure 10. Supply current vs supply voltage
Figure 11. Supply current vs
junction temperature
Figure 12. Safe operating area
(not repetitive surge)
TDE1747 Typical characteristics
9/17
Figure 13. Response time
