s-8533a60aft-tb-g Seiko Instruments Inc., s-8533a60aft-tb-g Datasheet - Page 10

• Manufacturer Part Number: s-8533a60aft-tb-g
• Description: Step-down, Synchronous Pwm Control Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

10
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8533 Series
Though the conditions mentioned above are required to prevent back-flow current, they are guidelines. Check the
validity by measuring the prototype or the actual device.
−109 mA
109 mA
I
OUT
0 mA
I
L
Coil current under no load
V
Figure 10 Example for No Back-Flow Current
IN
C
IN
ΔI
Back-flow
current
L
I
I
L
L
Figure 9 Back-Flow Current
max.
min.
+
Seiko Instruments Inc.
VIN
Back-flow current
VSS
PDRV
NDRV
218 mA
109 mA
I
OUT
0 mA
Coil
current I
I
L
L
Coil current when 109 mA
flows as a load
L
+
V
Back-flow current = 0 mA
OUT
ΔI
L
I
I
L
L
max.
min.
Rev.2.3
_00