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NCP5269 Datasheet(PDF) 8 Page - ON Semiconductor

Part No. NCP5269
Description  Synchronous Buck Controller with Auto Power Controller with Auto Power Inputs for System Agent
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP5269 Datasheet(HTML) 8 Page - ON Semiconductor

 
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NCP5269
http://onsemi.com
8
DETAILED DESCRIPTION
Overview
NCP5269 is designed for applications requiring
dynamically selected slew−rate controlled output voltages.
It provides a synchronous PWM controller that incorporates
all the control and protection circuitry necessary to satisfy a
wide range of applications. The NCP5269 PWM controller
employs adaptive ripple control to provide seamless
transition between CCM and DCM while maintain high
efficiency during light load. It also provides fast transient
response and excellent stability. The features of the
NCP5269 include a 2 bits VID selectable and external
programmable reference, fixed three preset switching
frequency, an error amplifier, adaptive gate driver,
programmable soft−start, and very low shutdown current.
The protection features of the NCP5269 include
over−current protection, power good monitor, over voltage
and under voltage protection, built in output discharge and
thermal shutdown.
Reference Voltage Programming
The NCP5269 incorporates 2−bits VID, which selects
four user−programmed reference voltages that reflect on
Vref pin. NCP5269 measures VFB and VREF pin voltage
relative to FBRTN pin. An internal reference that allows
output voltages as low as 0.65 V. The tolerance of the
internal reference is guaranteed over the entire operating
temperature range of the controller. The reference voltage is
trimmed using a test configuration that accounts for error
amplifier offset and bias currents. The VID truth tables for
each part are listed below.
Table 4. NCP5269 VID TRUTH TABLE
VID STATE
RESULTS
VID0
VID1
CLOSE
VREF
VOUT
0
0
SW3
Vset3
VOUT4
0
1
SW2
Vset2
VOUT3
1
0
SW1
Vset1
VOUT2
1
1
SW0
Vset0
VOUT1
+
E/A
FB
COMP
+
Vset
REF
650 mV
V1
V2
V3
SW0
SW1
SW2
SW3
R3
R4
R5
R6
FBRTN
CSS
FBRTN
R1
R2
FBRTN
VREF
VOUT
Figure 3.
External Reference Voltage and Output Voltage Setting
Vset0, Vset1, Vset2 and Vset3 can be calculated based on
the following equations:
Vset0 + VINREF
Vset1 + VINREF @ 1 )
R3
R4 ) R5 ) R6
Vset2 + VINREF @ 1 )
R3 ) R4
R5 ) R6
Vset3 + VINREF @ 1 )
R3 ) R4 ) R5
R6
And Vset3 u Vset2 u Vset1 u Vset0
Vset0, Vset1, Vset2 and Vset3 are in the range of
0
.65 V~1.5 V. If the required output voltage is higher than
0.65 V~1.5 V, a feedback voltage divider (a resistor R2 is
added from FB pin to FBRTN) can be used to boost the
output voltage up. So the output voltage can be calculated
based on the following equations:
VOUT1 + Vset0 @ 1 )
R1
R2
And VOUT4 u VOUT3 u VOUT2 u VOUT1
VOUT2 + Vset1 @ 1 )
R1
R2
VOUT3 + Vset2 @ 1 )
R1
R2
VOUT4 + Vset3 @ 1 )
R1
R2


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