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NCP1589DMNTWG Datasheet(PDF) 7 Page - ON Semiconductor

Part # NCP1589DMNTWG
Description  Low Voltage Synchronous Buck Controller with Light Load Efficiency and Transient Enhancement
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1589DMNTWG Datasheet(HTML) 7 Page - ON Semiconductor

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NCP1589D
http://onsemi.com
7
conduction mode. The output frequency can be determined
by the following equation:
FSW +
k1
Ramp_slope
Vout
R9
R10)R9
Vin
Vramp ) Voffset
1
1 ) k2
Vout
Vin
(eq. 2)
Where k1, k2 is an internal trimmed value; by default,
k1 = 1, k2 = 0, Ramp_slope = 0.5 V/
ms, Vramp = 1.5 V,
Voffset = 20 mV.
Light Load Operation
In continuous current conduction mode, the operating
frequency of the NCP1589D is almost constant. In light
load, it runs in a discontinuous current mode with a
scaled-down frequency as a function of the load current.
Internal zero current detection threshold will change
adaptively to ensure the minimum amount of diode
conduction period to further reduce the converter power
consumption in the light load condition.
Feedback Voltage
The NCP1589D allows the output voltage to be adjusted
from 0.8 V to 5 V via an external resistor divider network
(R1, R4 in Figure 1). The controller will try to maintain
0.8 V at the FB pin. Thus, if a resistor divider circuit was
placed across the feedback pin to Vout, the controller will
regulate the output voltage in proportion to the resistor
divider ratio in order to maintain 0.8 V at the FB pin. The
relation between the resistor divider network and the output
voltage is show in the following equation:
R4 + R1
Vref
Vout * Vref
+ R1
0.8 V
Vout * 0.8 V
(eq. 3)
Figure 4. Typical Startup Sequence
VCC
COMP
LG
UG
VOUT
FB
PGOOD
Internal
UVLO
Fault
1.3 V
0.8 V
NORMAL
Soft−Start Time
OCP
Programming Time
POR
4.4 V
4.0 V


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