TLV431, TLV431A, TLV431B

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR

SLVS139R − JULY 1996 − REVISED SEPTEMBER 2005

17

POST OFFICE BOX 655303

9

6

0

15

0.001

0.01

0.1

1

10

12

(for TLV431 and TLV431A)

3

CL − Load Capacitance − µF

Stable

VKA = VREF

VKA = 2 V

Stable

VKA = 3 V

TA = 25°C

150

Ω

CL

Vbat

IK

TEST CIRCUIT FOR VKA = VREF

150

Ω

CL

Vbat

IK

R1 = 10 k

Ω

R2

TEST CIRCUIT FOR VKA = 2 V, 3 V

−

+

−

+

IK = 15 mA Max

(for TLV431B)

CL − Load Capacitance − µF

9

6

0

15

0.001

0.01

0.1

1

10

12

3

Stable

VKA = 3 V

Stable

Unstable

VKA = 2 V

TA = 25°C

IK = 15 mA MAX

For VKA = VREF ,

Stable for CL = 1 pF to 10k nF

‡ The areas under the curves represent conditions that may cause the device to oscillate. For VKA = 2-V and 3-V curves, R2 and Vbat were adjusted

to establish the initial VKA and IK conditions with CL = 0. Vbat and CL 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.