RT8113 RICHTEK [Richtek Technology Corporation], RT8113 Datasheet - Page 13

• Manufacturer Part Number: RT8113
• Description: Single Phase VR11.1 PWM Controller with 7-bit VID
• Manufacturer: RICHTEK [Richtek Technology Corporation]

After V
for 800μs (t
After receiving valid VID code, V
or down to the voltage specified by VID code. After V
ramps to V
state for 1600μs (t
The ramping slew rate of t
external capacitor connected to SS pin. The voltage of
DS8113-02 April 2011
OUT
ramps to V
EAP
D3
) waiting for valid VID code sent by CPU.
= V
DAC
D5
) and then asserts PGOOD = high.
BOOT
− V
PGOOD
VCC12
VCC5
V
, the RT8113 stays in this state
ADJ
D2
DAC
and t
, the RT8113 stays in this
OUT
Soft Start Current (I
is Limited and Variant
V
D4
DAC
continues ramping up
Figure
is controlled by the
4.6V
9.6V
t
D1
3.
Figure 4. Soft-Start Wave forms
Circuit for Soft-Start and Dynamic VID
V
OUT
Soft Start
SS
SS
Circuit
C
I
t
)
SS
D2
SS
OUT
C3
ADJ
R1
R
ADJ
EAP
(Error AMP Positive Input)
the SS pin will always be V
0.7V is the typical turn-on threshold of an internal power
switch. Before PGOOD = high, the slew rate of V
limited to 16μA/C
of V
than soft start slew rate for dynamic VID feature. The soft
start waveform is shown in Figure 4.
R3
t
D3
EAP
FB
C1
is limited to 160μA/C
-
+
C2
EA
t
D4
R2
COMP
t
SS
D5
. When PGOOD = high, the slew rate
EAP
+0.7V, where the mentioned
SS
, which is 10 times faster
V
V
SS
BOOT
OUT
RT8113
www.richtek.com
EAP
13
is