■
By using PGOOD, it is possible to monitor power supply whether normal
operation or abnormal operation.
■
PGOOD terminal inside is comprised of at open drain.
Sink current of PGOOD is 50μA.
■
Voltage of PGOOD pin become low when over current protection circuitry is work,
or output voltage is different from a set point more than ±10%.
Fig. 9.1.1
Internal circuitry of
PGood
Fig.9.1.2
BRNS6
RC(5V/div)
Vin:12V
t0: 5ms(Max)
PGOOD
Vout:5.5V
Vout(2V/div)
load current:0A
PGOOD(2V/div)
Cin:22uFx2
Cout
:
100uF+47uF
5ms/div
Fig.9.1.3
BRNS12
RC(5V/div)
Vin:12V
t0: 5ms(Max)
PGOOD
Vout:5.5V
load current:0A
Vout(2V/div)
Cin:22uFx2
PGOOD(2V/div)
Cout
:
100uF+47uF
5ms/div
Fig.9.1.4
Vin:12V
t0: 5.0ms(Max)
BRNS20
RC(5V/div)
Vout:5.5V
PGOOD
load current:0A
Cin:22uFx3
Vout(2V/div)
Cout
:
100uF×2
PGOOD(2V/div)
5ms/div
BRNS 9-1
9.Power Good
t0
t0
t0
Applications manual
For BRNS series