TLV431ILPR datasheet(17/38 Pages) TI

17 / 38 page

TLV431, TLV431A, TLV431B

LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR

SLVS139T − JULY 1996 − REVISED JUNE 2007

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION†

0.001

0.01

0.1

STABILITY BOUNDARY CONDITION‡

(for TLV431 and TLV431A)

CL − Load Capacitance − µF

Stable

VKA = VREF

VKA = 2 V

Stable

VKA = 3 V

TA = 25°C

150

Ω

Vbat

TEST CIRCUIT FOR VKA = VREF

150

Ω

Vbat

R1 = 10 k

Ω

TEST CIRCUIT FOR VKA = 2 V, 3 V

−

IK = 15 mA Max

STABILITY BOUNDARY CONDITION‡

(for TLV431B)

CL − Load Capacitance − µF

0.001

0.01

0.1

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.

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