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NCV8501 Datasheet(PDF) 11 Page - ON Semiconductor

Part # NCV8501
Description  Micropower 150 mA LDO Linear Regulators
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV8501 Datasheet(HTML) 11 Page - ON Semiconductor

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NCV8501 Series
http://onsemi.com
11
APPLICATION NOTES
Figure 18. Additional Output Current
NCV8501
VIN
VOUT
VADJ
C2
0.1 mF
VBAT
5.0 V
MJD31C
R1
294 k
R2
100 k
C1
47 mF
>1 Amp
Adding Capability
Figure 18 shows how the adjustable version of parts can
be used with an external pass transistor for additional current
capability. The setup as shown will provide greater than 1
Amp of output current.
FLAG MONITOR
Figure 19 shows the FLAG Monitor waveforms as a result
of the circuit depicted in Figure 16. As the output voltage
falls (VOUT), the Monitor threshold is crossed. This causes
the voltage on the FLAG output to go low sending a warning
signal to the microprocessor that a RESET signal may occur
in a short period of time. TWARNING is the time the
microprocessor has to complete the function it is currently
working on and get ready for the RESET shutdown signal.
Figure 19. FLAG Monitor Circuit Waveform
VOUT
MON
RESET
FLAG Monitor
Ref. Voltage
TWARNING
FLAG
Figure 20. Test and Application Circuit Showing
Output Compensation
VIN
VOUT
COUT**
10 mF
RRST
RESET
CIN*
0.1 mF
NCV8501
*CIN required if regulator is located far from the power supply filter
**COUT required for stability. Capacitor must operate at minimum
temperature expected
SETTING THE DELAY TIME
The delay time is controlled by the Reset Delay Low
Voltage, Delay Switching Threshold, and the Delay Charge
Current. The delay follows the equation:
tDELAY +
CDELAY(Vdt * Reset Delay Low Voltage)
Delay Charge Current
Example:
Using CDELAY = 33 nF.
Assume reset Delay Low Voltage = 0.
Use the typical value for Vdt = 1.8 V.
Use the typical value for Delay Charge Current = 2.5
mA.
tDELAY +
33 nF(1.8 * 0)
2.5 mA
+ 23.8 ms
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start−up
delay, load transient response and loop stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints.
The value for the output capacitor COUT shown in Figure 20
should work for most applications, however it is not
necessarily the optimized solution.


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