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S8355 Datasheet(PDF) 26 Page - Seiko Instruments Inc

Part # S8355
Description  STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
PDF  72 Pages
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S8355 Datasheet(HTML) 26 Page - Seiko Instruments Inc

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STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series
Rev.8.1_01
26
Integration of the equation (6) is as follows :
t
L
V
V
V
I
I
IN
D
OUT
PK
L
•
−
+
−
=
(7)
During tON, the energy is stored in L and is not transmitted to VOUT. When receiving the output current (IOUT) from VOUT,
the energy of the capacitor (CL) is consumed. As a result, the pin voltage of CL is reduced, and goes to the lowest level
after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted through the diode to CL, and
the voltage of CL rises rapidly. VOUT is a time function, and therefore indicates the maximum value (ripple voltage (VP−P) )
when the current flowing through into VOUT and load current (IOUT) match.
Next, the ripple voltage is determined as follows.
IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level :
1
IN
D
OUT
PK
OUT
t
L
V
V
V
I
I
•
−
+
−
=
(8)


−
+
•
−
=
∴
IN
D
OUT
OUT
PK
1
V
V
V
L
)
I
I
(
t
(9)
When M1 is turned OFF (tOFF), IL = 0 (when the energy of the inductor is completely transmitted). Based on equation (7) :
PK
OFF
IN
D
OUT
I
t
V
V
V
L
=


−
+
(10)
When substituting equation (10) for equation (9) :
OFF
PK
OUT
OFF
1
t
I
I
t
t
•


−
=
(11)
Electric charge
ΔQ1 which is charged in CL during t1 :
2
1
IN
D
OUT
1
PK
1
t
0
IN
D
OUT
1
t
0
PK
L
1
t
0
1
t
2
1
L
V
V
V
t
I
tdt
L
V
V
V
dt
I
dt
I
Q
•
−
+
−
•
=
•
−
+
−
•
=
=
Δ
(12)
When substituting equation (12) for equation (9) :
()
1
OUT
PK
1
OUT
PK
PK
t
2
I
I
t
I
I
2
1
I
1
Q
•
+
=
•
−
−
=
Δ
(13)
A rise in voltage (VP−P) due to
ΔQ 1 :
1
OUT
PK
L
L
1
P
P
t
2
I
I
C
1
C
Q
∆
V
•
+
•
=
=
−
(14)
When taking into consideration IOUT to be consumed during t1 and the Equivalent Series Resistance (RESR) of CL :
L
1
OUT
ESR
OUT
PK
OUT
PK
L
L
1
P
P
C
t
I
R
2
I
I
1
t
2
I
I
C
1
C
Q
V
•
−
•
+
+
•
+
•
=
Δ
=
−
(15)
When substituting equation (11) for equation (15) :
ESR
OUT
PK
L
OFF
PK
2
OUT
PK
P
P
R
2
I
I
C
t
I
2
)
I
I
(
V
•
+
+
•
−
=
−
(16)
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity
and a small RESR.



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