TL431C Datasheet, PDF (5/16 Pages) NXP Semiconductors – Adjustable precision shunt regulators

Philips Semiconductors
Adjustable precision shunt regulators
Product specification
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
αV_REF can be positive or negative depending on whether minimum V_REF of maximum V_REF, respectively, occurs at the lower temperature.
Example: Max V_REF = 2496mV at 30°C, Min V_REF = 2492mV at 0°C, V_REF = 2495mV at 25°C, DTA = 70°C for TL431C.
ǒ Ǔ _{| aVREF | +}
4mV
2495mV
@ 10⁶
70^oC
+ 23ppmń^oC
Because minimum V_REF occurs at the lower temperature, the coefficient is positive.
4.
The dynamic impedance is defined as: _{| ZKA |}
+
DV_KA
DI_K
When the device is operating with two external resistors, (see Figure xx), the total dynamic impedance of the circuit is given by:
ǒ Ǔ | ZȀ |
+
DV
DI
[ | Z_KA |
1
)
R1
R2
PARAMETER MEASUREMENT INFORMATION
INPUT
V_KA
I_K
INPUT
V_KA
I_off
V_ref
Figure 3. Test Circuit for V_KA = V_ref
SL01177
INPUT
R1
R2
V_KA
I_K
I_ref
V_ref
ǒ Ǔ VKA
+ Vref
1
)
R1
R2
) Iref
R1
Figure 4. Test Circuit for V_KA > V_ref
SL01178
Figure 5. Test Circuit for I_OFF
SL01179
1997 Feb 25
5