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NCV47722. データシート(PDF) 9 Page - ON Semiconductor

部品番号 NCV47722.
部品情報  High Side Switch with Adjustable Current Limit
PDF  14 Pages
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV47722. データシート(HTML) 9 Page - ON Semiconductor

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Figure 13. Simplified Functional Diagram of OFF
State Diagnostics (STB and OL)
Vout
+
− VREF_OFF
EF
PASS DEVICE is OFF in Diagnostics
Mode in OFF state
Vin
Current source enabled via EN and DE pins
Comparator active only in Diagnostic
state (DE = H).
IPU
EN – Enable (Logic Input)
DE – Diagnostics Enable (Logic Input)
EF – Error Flag Output (Open Collector Output)
EN
DE
RPD1
RPD2
Digital Diagnostics:
to MCU’s digital input
with pull−up resistor
to MCU’s DIO supply rail
EN DE IPU EF
Vout
Diagnostic Status/Action
L
L
OFF
HZ
Unknown
None (Diagnostics OFF)
L
H
OFF
L
Vout > Vout_OFF
Short to Battery (STB)
L
H
OFF
HZ Vout < Vout_OFF
Check for Open Load (OL)
HH
ON
L
Vout > Vout_OFF
Open Load (OL)
H
H
ON
HZ V
out < Vout_OFF
No Failure (V
out close to 0 V)
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.
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 14. Flowchart for Diagnostics in OFF State
IPU ON. Set
EN = H & DE = H
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 10)
Open Load (OFF)
H
H
High (Vout ~ Vin)
Low (~0 V)
L (Note 11)
Normal (OFF)
H
H
Low (~0 V)
Low (~0 V)
HZ (Note 11)
Open Load (ON)
H
L
High (Vout ~ Vin)
Low (~0 V)
HZ
Normal (ON)
H
L
High (Vout ~ Vin)
Proportional to Iout (±5%) (Note 12)
HZ
Over Current
H
L
Vin − 1 V
High (~2.55 V)
L
Short to Ground
H
L
Low (~0 V)
High (~2.55 V)
L
10. Internal current source disabled (between Vout and Vin).
11. Internal current source enabled (between Vout and Vin).
12. Valid for Iout = 50 mA to 350 mA. For Iout = 10 mA to 50 mA range proportional to Iout (±15%).



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