Datasheet

I 20000 x
LIM
@
1.2V
5000 + R
SET
OPA564
SBOS372E –OCTOBER 2008– REVISED JANUARY 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Boldface limits apply over the specified temperature range: T
A
= –40°C to +85°C.
At T
CASE
= +25°C, V
S
= ±12V, R
LOAD
= 20kΩ to GND, R
SET
= 7.5kΩ, and E/S pin enabled, unless otherwise noted.
OPA564
PARAMETERS CONDITIONS MIN TYP MAX UNIT
OUTPUT, continued
Maximum Continuous Current, dc I
OUT
1.5
(2)
A
Output Impedance, closed loop R
O
f = 100kHz 10 Ω
Output Impedance, open loop Z
O
G = +2, f = 100kHz See Figure 24, Typical Characteristics
Output Current Limit Range
(3)
±0.4 to ±2.0 A
Current Limit Equation I
LIM
A
(4) (5)
Solved for R
SET
(Current Limit) R
SET
≅ (24k/I
LIM
) – 5kΩ Ω
Current Limit Accuracy I
LIM
= 1.5A 10 %
Current Limit Overshoot
(6) (7)
V
IN
= 5V Pulse (200ns t
r
), G = +2 50 %
Output Shut Down
Output Impedance
(8)
6 || 120 GΩ || pF
Capacitive Load Drive C
LOAD
See Figure 6, Typical Characteristics
DIGITAL CONTROL
Enable/Shutdown Mode INPUT V
DIG
= +3.3V to +5.5V referenced to V–
V
E/S
High (output enabled) E/S Pin Open or Forced High (V–)+2 (V–)+V
DIG
V
V
E/S
Low (output shut down) E/S Pin Forced Low (V–) (V–)+0.8 V
I
E/S
High (output enabled) E/S Pin Indicates High 10 mA
I
E/S
Low (output shut down) E/S Pin Indicates Low 1 mA
Output Shutdown Time 1 ms
Output Enable Time 3 ms
Current Limit Flag Output
Normal Operation Sinking 10mA 0 (V–)+0.8 V
Current-Limited Sourcing 20mA (V–)+2 V
DIG
V
Thermal Shutdown
Normal Operation Sinking 200mA 0 (V–)+0.8 V
Thermally Shutdown
(9)
Sourcing 200mA (V–)+2 V
DIG
V
+140 to
Junction Temperature at Shutdown
(10)
°C
+157
Hysteresis
(10)
15 to 19 °C
T
SENSE
Diode Ideality Factor h 1.033
(2) Under safe operating conditions. See Power Dissipation and Safe Operating Area for safe operating area (SOA) information.
(3) Minimum current limit is 0.4A. See Adjustable Current Limit in the Applications section.
(4) Quiescent current increases when the current limit is increased (see Typical Characteristics).
(5) R
SET
(current limit) can range from 55kΩ (I
OUT
= 400mA) to 10kΩ (I
OUT
= 1.6A typ). See Adjustable Current Limit in the Applications
section.
(6) See Typical Characteristics.
(7) Transient load transition time must be ≥ 200ns.
(8) See Enable/Shutdown (E/S) Pin in the Applications section.
(9) When sourcing, the V
DIG
supply must be able to supply the current.
(10) Characterized, but not production tested.
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