MB39C313 FUJITSU [Fujitsu Component Limited.], MB39C313 Datasheet - Page 20

• Manufacturer Part Number: MB39C313
• Description: 4ch System Power Management IC for LCD Panel
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

MB39C313
4. Others
4.1) DLY1 / DLY2 delay time setting
4.2) V
4.3) V
20
With time delay (t
Without time delay (t
Where:
t
C
V
Output voltage setting :
Where:
V
Feed-forward capacitance :
Where :
f
Soft start:
Internal preset
The soft start cycle start after EN1 is asserted and the duration is internally set to 1 ms.
Output voltage setting:
Feed-forward capacitance:
Where :
f
Soft start:
set by external capacitor connected to SS pin
(Soft start active when SS pin voltage < FB voltage)
GD pin:
GD goes L if FB > 1.03 V after delay time DLY2
GD gives Hi-Z if FB ≤ 1.03 V after delay time DLY2
delay
z1
z2
C
VO1 = V
C
VO2 = 1.146 ×
C
REF
REF
delay
= a zero in transfer function
= a zero in transfer function
delay
LOGIC
ff1
S
ff2
: Boost converter
= delay time,
= 1.213 V
= 1.213 V, R2 ≤ 1.2 kΩ
=
=
= Capacitor value connected to DLY-pin,
=
: Buck converter
REF
5.5 μA × t
×
2 × π × R1 × f
2 × π × R3 × f
(
V
1 +
(
REF
delay
1 +
1
1
): DLY1 / DLY2 = open
delay
delay
R1
R2
R3
R4
): for each DLY1 / DLY2,
)
z1
z2
)
DS04–27267–1E