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S8355 Datasheet(PDF) 25 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) 25 Page - Seiko Instruments Inc

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STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.8.1_01
S-8355/56/57/58 Series
25
4. Operation
The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 14.)
CL
M1
D
VOUT
CONT
VIN
L
+
EXT
VSS
−
Figure 14 Step-Up Switching Regulator Circuit for Basic Equation
Voltage at CONT pin at the moment M1 is turned ON (VA) *1 :
VA = VS *2
(1)
*1.
Current flowing through L (IL) is zero.
*2.
Non-saturated voltage of M1.
The change in IL over time :
L
V
V
L
V
dt
dI
S
IN
L
L
−
=
=
(2)
Integration of equation (2) (IL) :
t
L
V
V
I
S
IN
L
•
−
=
(3)
IL flows while M1 is ON (tON). The time of tON is determined by the oscillation frequency of OSC.
The peak current (IPK) after tON :
ON
S
IN
PK
t
L
V
V
I
•
−
=
(4)
The energy stored in L is represented by 1/2
• L (IPK)2.
When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor.
Then, the reverse voltage (VL) is generated :
VL = (VOUT
+ VD*1) − VIN
(5)
*1.
Diode forward voltage
The voltage at CONT pin rises only by VOUT
+VD.
The change in the current (IL) flowing through the diode into VOUT during tOFF :
L
V
V
V
L
V
dt
dI
IN
D
OUT
L
L
−
+
=
=
(6)



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