Datasheet

TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
†
9
6
0
15
0.001 0.01 0.1 1 10
− Cathode Current − mA
12
STABILITY BOUNDARY CONDITION
‡
(for TLV431 and TLV431A)
3
I
K
C
L
− Load Capacitance − µF
Stable
V
KA
= V
REF
V
KA
= 2 V
Stable
V
KA
= 3 V
T
A
= 25°C
150 Ω
C
L
V
bat
I
K
TEST CIRCUIT FOR V
KA
= V
REF
150 Ω
C
L
V
bat
I
K
R1 = 10 kΩ
R2
TEST CIRCUIT FOR V
KA
= 2 V, 3 V
−
+
−
+
I
K
= 15 mA Max
− Cathode Current − mA
STABILITY BOUNDARY CONDITION
‡
(for TLV431B)
I
K
C
L
− Load Capacitance − µF
9
6
0
15
0.001 0.01 0.1 1 10
12
3
Stable
V
KA
= 3 V
Stable
Unstable
V
KA
= 2 V
T
A
= 25°C
I
K
= 15 mA MAX
For V
KA
= V
REF
,
Stable for C
L
= 1 pF to 10k nF
‡
The areas under the curves represent conditions that may cause the device to oscillate. For V
KA
= 2-V and 3-V curves, R2 and V
bat
were adjusted
to establish the initial V
KA
and I
K
conditions with C
L
= 0. V
bat
and C
L
then were adjusted to determine the ranges of stability.
Figure 17
†
Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.