OPA564_15 Datasheet, PDF (20/37 Pages) Texas Instruments – 1.5A, 24V, 17MHz POWER OPERATIONAL AMPLIFIER

OPA564
SBOS372E – OCTOBER 2008 – REVISED JANUARY 2011
Ensuring Microcontroller Compatibility
Not all microcontrollers output the same logic state
after power-up or reset. 8051-type microcontrollers,
for example, output logic high levels while other
models power up with logic low levels after reset. In
the configuration of Figure 38(a), the shutdown signal
is applied on the cathode side of the photodiode
www.ti.com
within the optocoupler. A high logic level causes the
OPA564 to be enabled, and a low logic level shuts
the OPA564 down. In the configuration of
Figure 38(b), with the logic signal applied on the
anode side, a high level causes the OPA564 to shut
down, and a low level enables the op amp.
OUTPUT SHUTDOWN OUTPUT VOLTAGE vs OUTPUT CURRENT
500
V_S = ±12V
450
400
350
300
250
200
150
100
50
0
-10 -8 -6 -4 -2 0 2 4 6 8 10
Output Voltage (V)
Test Circuit
E/S = Low (Output Shutdown)
I_OUT
OPA564
V_OUT
Figure 42. Output Shutdown Output Impedance
R_F
V+
V+
External protection
diodes as needed
-IN
1.6kW
V+
R₁
V-
I₁
V+
I₂
6GW
120pF
V-
+IN
1.6kW
V_OUT
V-
V-
Figure 43. OPA564: Output Shutdown Equivalent Circuit (with External Feedback)
20
Submit Documentation Feedback
Product Folder Link(s): OPA564
© 2008–2011, Texas Instruments Incorporated