TL431, TL431A
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS005N – JULY 1978 – REVISED MARCH 2002
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
TEST
TL431AC
CIRCUIT
MIN TYP MAX
Vref Reference voltage 2 VKA = V ref, IKA = 10 mA 2470 2495 2520 mV
VI(dev) Deviation of reference voltage
over full temperature range
(see Figure 1) 2VKA = V ref, IKA = 10 mA,
TA = 0°C to 70°C4 25 mV
D
V
Ratio of chan
e in reference volta
e
∆VKA = 10 V – V ref –1.4 –2.7
D
VKA
to the change in cathode voltage
KA =
∆VKA = 36 V – 10 V –1–2
V
Iref Reference current 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞2 4 µA
II(dev) Deviation of reference current
over full temperature range
(see Figure 1) 3IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = 0°C to 70°C0.8 1.2 µA
Imin Minimum cathode current
for regulation 2 VKA = V ref 0.4 0.6 mA
Ioff Of f-state cathode current 4 VKA = 36 V, Vref = 0 0.1 0.5 µA
|zKA|Dynamic impedance (see Figure 1) 1IKA = 1 mA to 100 mA, VKA = Vref,
f ≤ 1 kHz 0.2 0.5 Ω
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
TEST
TL431AI
CIRCUIT
MIN TYP MAX
Vref Reference voltage 2 VKA = V ref, IKA = 10 mA 2470 2495 2520 mV
VI(dev) Deviation of reference voltage
over full temperature range
(see Figure 1) 2VKA = V ref, IKA = 10 mA,
TA = –40°C to 85°C5 50 mV
D
V
Ratio of chan
e in reference volta
e
∆VKA = 10 V – V ref –1.4 –2.7
D
VKA
to the change in cathode voltage
KA =
∆VKA = 36 V – 10 V –1–2
V
Iref Reference current 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞2 4 µA
II(dev) Deviation of reference current
over full temperature range
(see Figure 1) 3IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = –40°C to 85°C0.8 2.5 µA
Imin Minimum cathode current
for regulation 2 VKA = V ref 0.4 0.7 mA
Ioff Of f-state cathode current 4 VKA = 36 V, Vref = 0 0.1 0.5 µA
|zKA|Dynamic impedance (see Figure 1) 2IKA = 1 mA to 100 mA, VKA = Vref,
f ≤ 1 kHz 0.2 0.5 Ω