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CS5159 Datasheet(PDF) 11 Page - ON Semiconductor

Part No. CS5159
Description  CPU 5−Bit Synchronous Buck Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5159 Datasheet(HTML) 11 Page - ON Semiconductor

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CS5159
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Figure 15. OVP Response to an Input−to−Output Short
Circuit by Pulling the Input Voltage to Ground
M 5.00 ms
Trace 1− Regulator Output Voltage (1.0 V/div.)
Trace 4− 5.0 V from PC Power Supply (2.0 V/div.)
External Output Enable Circuit
On/off control of the regulator can be implemented
through the addition of two additional discrete components
(see Figure 16). This circuit operates by pulling the Soft
Start pin high, and the VFFB pin low, emulating a short
circuit condition.
Figure 16. Implementing Shutdown with the CS5159
Shutdown
Input
5.0 V
MMUN2111T1 (SOT−23)
5
8 V
FFB
SS
IN4148
CS5159
External Power Good Circuit
An optional Power Good signal can be generated through
the use of four additional external components (see Figure
17). The threshold voltage of the Power Good signal can be
adjusted per the following equation:
VPower Good +
(R1 ) R2)
0.65 V
R2
This circuit provides an open collector output that drives
the Power Good output to ground for regulator voltages less
than VPower Good.
Figure 17. Implementing Power Good with the CS5159
5.0 V
Power Good
10 k
VOUT
PN3904
6.2 k
R1
R2
PN3904
10 k
R3
CS5159
Figure 18. CS5159 Demonstration Board During Power
Up. Power Good Signal is Activated when Output
Voltage Reaches 1.70 V.
M 2.50 ms
Trace 4− 5.0 V Input (2.0 V/div.)
Trace 3 − 12 V Input (VCC1) and (VCC2) (10 V/div.)
Trace 1− Regulator Output Voltage (1.0 V/div.)
Trace 2− Power Good Signal (2.0 V/div.)
Selecting External Components
The CS5159 can be used with a wide range of external
power components to optimize the cost and performance of
a particular design. The following information can be used
as general guidelines to assist in their selection.
NFET Power Transistors
Both logic level and standard MOSFETs can be used. The
reference designs derive gate drive from the 12 V supply
which is generally available in most computer systems and
utilize logic level MOSFETs. Multiple MOSFETs may be
paralleled to reduce losses and improve efficiency and
thermal management.
Voltage applied to the MOSFET gates depends on the
application circuit used. Both upper and lower gate driver
outputs are specified to drive to within 1.5 V of ground when
in the low state and to within 2.0 V of their respective bias
supplies when in the high state. In practice, the MOSFET
gates will be driven rail to rail due to overshoot caused by the
capacitive load they present to the controller IC. For the


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