RAA230221 查看數據表（PDF） - Renesas Electronics
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RAA230221 Datasheet PDF : 32 Pages
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RAA23022x RAA23023x
Power Good
Power Good is an open-drain output that requires a pull − up resistor (Recommended value =
100kΩ). PGOOD pin becomes high impedance (HiZ) when either CH1 or CH2 FB pin voltage and
thus its output voltage rises above 80% of nominal regulation point. If it is pulled-up, PGOOD
output high level. PGOOD pin goes low when both CH1 or CH2 output voltage falls below 80% of
the regulation point. When both EN1 and EN2 pin goes low level, PGOOD pin becomes HiZ
because VREG is used for power good control and it fall down at this time. So, if PGOOD pin is
connected to VIN, its status becomes high level even if CH1 and CH2 stop. PGOOD pin must be
pulled up to CH1 output, CH2 output or VREG when using this function.
CH1 and CH2 can be started in order by connecting PGOOD pin to EN1 or EN2. This function can
be also used for sequence signal for other devices.
Circuit example when CH2 is started after CH1
EN1
EN2
100kΩ
PGOOD
VREG
1uF
CH1
CH2
Power good
control
VREG
EN1
VREG
VOUT1
PGOOD
EN2
VOUT2
2ms
(1ms)
2ms
R18DS0017EJ0100 REV.1.00
Apr.21.2015
Page 19 of 30
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