CS5155GD16 CHERRY [Cherry Semiconductor Corporation], CS5155GD16 Datasheet - Page 13

• Manufacturer Part Number: CS5155GD16
• Description: CPU 5-Bit Synchronous Buck Controller
• Manufacturer: CHERRY [Cherry Semiconductor Corporation]

capacitor directly to the ground of the fast feedback filter
capacitor to prevent common mode noise from effecting
the PWM comparator.
possible and connect the ground terminal to pin 14 (LGnd).
both slow and fast feedback pins 16 (V
the regulator output right at the inductor terminal. Connect
inductor to the output capacitors via a trace with the fol-
lowing resistance:
This causes the output voltage to be +40mV with no load,
and -40mV with a full load, improving regulator transient
response. This trace must be wide enough to carry the full
output current. (Typical trace is 1.0 inch long, 0.17 inch
wide). Care should be taken to minimize any additional
losses after the feedback connection point to maximize reg-
ulation.
Figure 21: 5V to 3.3V/10A converter.
Figure 22: 5V to 3.3V/10A converter with current sharing.
4. Connect the ground terminals of the Compensation
5. Place the output filter capacitor(s) as close to the load as
6. To implement adaptive voltage positioning, connect
MBRS
MBRS
120
120
0.1mF
0.1mF
0.33mF
0.1mF
330pF
330pF
0.1mF
MBRS120
1mF
1mF
MBRS120
0.33mF
V
V
V
V
V
V
C
SS
COMP
V
V
V
V
V
V
C
SS
COMP
5V
CC1
5V
ID0
ID1
ID2
ID3
ID4
OFF
CC1
ID0
ID1
ID2
ID3
ID4
OFF
MBRS120
MBRS120
CS5155
CS5155
LGnd
V
LGnd
V
CC2
CC2
R
V
V
V
V
GATE(H)
GATE(L)
TRACE
GATE(H)
GATE(L)
PGnd
PGnd
V
V
V
FFB
V
FFB
FB
FB
1mF
1mF
=
Si4410DY
100pF
80mV
100pF
I
Si4410
MAX
3.3k
3.3k
FB
Si9410DY
Si9410
) and 8 (V
+
+
Applications Information: continued
10W
3mH
100mF/10V x 3
Tantalum
3mH
100mF/10V x 3
Tantalum
Additional Application Circuits
+
+
100mF/10V x 3
Tantalum
Connect to
other circuits for
current sharing
FFB
100mF/10V x 3
Tantalum
3.3V/10A
) to
3.3V/10A
Remote
Sense
13
7. If DC regulation is to be optimized (at the expense of
degraded transient regulation), adaptive voltage position-
ing can be disabled by connecting to V
load with a separate trace (remote sense).
8. Place 5V input capacitors close to the switching MOSFET
and synchronous MOSFET.
(pin 12 when used) with traces that are a minimum of 0.025
inches wide.
Figure 20: Layout Guidelines
Figure 23: 3.3V to 2.5V/7A converter with 12V bias.
Route gate drive signals V
0.1mF
1.0mF
V
330pF
COMP
1mF
0.33mF
V
V
V
V
V
C
SS
COMP
V
12V
CC1
ID0
ID1
ID2
ID3
ID4
OFF
To the negative terminal of the output capacitors
SOFTSTART
CS5155
LGnd
V
CC2
0.1mF
V
V
V
CC
15
GATE(H)
GATE(L)
PGnd
V
V
FFB
FB
GATE(H)
5
To the negative terminal of the
11
100pF
Si9410
OFF TIME
3.3k
8
(pin 10) and V
3.3V
Si9410
input capacitors
FB
100pF
V
+
FFB
pin directly to the
5mH
33mF/25V x 3
Tantalum
+
GATE(L)
100mF/10V x 2
Tantalum
2.5V/7A