L6713A STMicroelectronics, L6713A Datasheet - Page 42

• Manufacturer Part Number: L6713A
• Description: IC CTRLR 2/3PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6713A

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 3
• Voltage - Output: 0.3 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Output Current: 2 A
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Soft-start
16
16.1
42/64
Soft-start
L6713A implements a soft-start to smoothly charge the output filter avoiding high in-rush
currents to be required to the input power supply. The device increases the reference from
zero up to the programmed value in different ways according to the selected operative mode
and the output voltage increases accordingly with closed loop regulation.
The device implements soft-start only when all the power supplies are above their own turn-
on thresholds and the OUTEN pin is set free.
At the end of the digital soft-start, SS_END/PGOOD signal is set free. Protections are active
during this phase; under voltage is enabled when the reference voltage reaches 0.6 V while
over voltage is always enabled with a threshold dependent on the selected operative mode
or with the fixed threshold programmed by R
OVP”
Figure 15. Soft-start
Intel mode
Once L6713A receives all the correct supplies and enables, and Intel mode has been
selected, it initiates the soft-start phase with a T
ramps up to V
and waits for T
will then ramps up to the programmed value in T
Figure
SS/LTB/AMD defines the frequency of an internal additional soft-start-oscillator used to step
the reference from zero up to the programmed value; this oscillator is independent from the
main oscillator whose frequency is programmed through the OSC pin.
In particular, it allows to precisely programming the start-up time up to V
a fixed voltage independent by the programmed VID. Total soft-start time dependence on
the programmed VID results
SS_END
OUTEN
Section).
V
15).
OUT
BOOT
3
= 75 μsec
T
1
= 1.081 V (1.100V - 19mV) in T
T
T
2
OVP
Intel Mode
SS
T
(typ)
3
T
(See Figure 17
4
during which the device reads the VID lines. Output voltage
t
t
t
OVP
and
1
4
(See “Over voltage and programmable
See Figure
= 1 ms
2
with the same slope as before
PGOOD
OUTEN
according to the SS/LTBG/AMD settings
V
OUT
(min)
delay. After that, the reference
19).
OVP
AMD 6BIT Mode
T
SS
BOOT
(T
2
) since it is
(See
L6713A
t
t
t