NCV8501D50R2G datasheet(11/16 Pages) ONSEMI

Part #	NCV8501D50R2G

Description	Micropower 150 mA LDO Linear Regulators with ENABLE, DELAY, RESET, and Monitor FLAG

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NCV8501 Series

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11

APPLICATION NOTES

Figure 17. 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 17 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 18 shows the FLAG Monitor waveforms as a result

of the circuit depicted in Figure 15. 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 18. FLAG Monitor Circuit Waveform

VOUT

MON

RESET

FLAG Monitor

Ref. Voltage

TWARNING

FLAG

Figure 19. 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 19

should work for most applications, however it is not

necessarily the optimized solution.

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NCV8501D50R2G Datasheet(PDF) 11 Page - ON Semiconductor

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