SI823X Datasheet, PDF (25/52 Pages) Silicon Laboratories – 0.5 AND 4.0 AMP ISODRIVERS (2.5 AND 5 KVRMS)

Si823x
5.6.3. Under Voltage Lockout (UVLO)
The UVLO circuit unconditionally drives VO low when VDD is below the lockout threshold. Referring to Figures 36
through 39, upon power up, the Si823x is maintained in UVLO until VDD rises above VDD_UV+. During power down,
the Si823x enters UVLO when VDD falls below the UVLO threshold plus hysteresis (i.e., VDD < VDD_UV+ –
VDD_HYS).
VDDUV+ (Typ)
VDDUV+ (Typ)
3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5
Supply Voltage (V_DD - V_SS) (V)
Figure 36. Si823x UVLO Response (5 V)
VDDUV+ (Typ)
8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5
Supply Voltage (V_DD - V_SS) (V)
Figure 38. Si823x UVLO Response (10 V)
VDDUV+ (Typ)
6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
Supply Voltage (V_DD - V_SS) (V)
Figure 37. Si823x UVLO Response (8 V)
11.3 11.8 12.3 12.8 13.3 13.8 14.3 14.8 15.3
Supply Voltage (V_DD - V_SS) (V)
Figure 39. Si823x UVLO Response (12.5 V)
Rev. 0.3
25