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NCV47721 Datasheet(PDF) 13 Page - ON Semiconductor

No. de Pieza. NCV47721
Descripción  Adjustable LDO with Adjustable Current Limit
Descarga  16 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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NCV47721 Datasheet(HTML) 13 Page - ON Semiconductor

 
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NCV47721
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Start
Diag. OFF. Set
EN = L & DE = L
EF = ?
Diag. ON. Set
EN = L & DE = H
L
HZ
EF = ?
L
HZ
No Failure
Open Load
Short to Battery
Figure 20. Flowchart for Diagnostics in OFF State
SPU ON. Set
EN = H & DE = H
For diagnostics in OFF state the input DE pin has to be put
logic high. Logic level on EN pin determines which failure
(STB or OL) is diagnosed. For detailed information see
Diagnostic Truth Table 7.
Diagnostic in ON State
Diagnostic in ON State provides information about
Overcurrent or Short to Ground failures, during which the
EF output is in logic low state. For detailed information see
Diagnostic Features Truth Table 7.
Table 7. DIAGNOSTIC FEATURES TRUTH TABLE
Operational Status
EN
DE
Output Voltage (Vout)
Diagnostic Output (CSO)
Error Flag (EF)
Disabled
L
L
Low (~0 V)
Low (~0 V)
HZ
Short to Battery
L
H
High (Vout ~ Vin)
Low (~0 V)
L (Note 13)
Open Load (OFF)
H
H
High (Vout ~ Vin)
Low (~0 V)
L (Note 14)
Normal (OFF)
H
H
Low (~0 V)
Low (~0 V)
HZ (Note 14)
Open Load (ON)
H
L
Vout_nom
Low (~0 V)
HZ
Normal (ON)
H
L
Vout_nom
Proportional to Iout (±5%)
HZ
Over Current
H
L
≤ 90% of Vout_nom
High (~2.55 V)
L
Short to Ground
H
L
Low (~0 V)
High (~2.55 V)
L
13. Internal current source disabled (between Vout and Vin)
14. Internal current source enabled (between Vout and Vin)


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