L6706TR STMicroelectronics, L6706TR Datasheet - Page 38

• Manufacturer Part Number: L6706TR
• Description: IC CTLR SGL PHASE VR11.1 40VFQFP
• Manufacturer: STMicroelectronics

Specifications of L6706TR

• Applications: Controller, Intel VR11.1
• Voltage - Input: 3.7 ~ 12 V
• Number Of Outputs: 1
• Voltage - Output: 0.03 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 40-VFQFN, 40-VFQFPN
• 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
• Other names: 497-8975-2

Oscillator
16
38/47
F
SW
F
SW
=
=
200 kHz
200 kHz
(
Oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The current delivered to the
oscillator is typically 25 μA (corresponding to the free running frequency F
and it may be varied using an external resistor (R
pin and SGND or VCC (or a fixed voltage greater than 1.24 V). Since the OSC/FAULT pin is
fixed at 1.240 V, the frequency is varied proportionally to the current sunk (forced) from (into)
the pin considering the internal gain of 10 kHz/μA.
In particular connecting R
pin), while connecting R
the pin), according the following relationships:
R
R
Maximum programmable switching frequency must be limited to 1 MHz to avoid minimum
Ton limitation. Anyway, device power dissipation must be checked prior to design high
switching frequency systems.
Figure 22. R
(
OSC
OSC
)
vs. SGND
vs. +12V
–
)
12V 1.240V
----------------------------------- - 9.1 kHz
+
R
--------------------------- - 9.1
R
OSC
1.240V
OSC
–
(
(
kΩ
OSC
kΩ
)
)
⋅
vs. switching frequency
⋅
kHz
---------- -
μA
---------- -
μA
OSC
OSC
=
=
to VCC = 12 V the frequency is reduced (current is forced into
200 kHz
200 kHz
to SGND the frequency is increased (current is sunk from the
Doc ID 15698 Rev 2
(
(
)
) 9.7916 10
+
–
------------------------------- -
11.284 10
------------------------------- -
R
R
OSC
OSC
(
(
⋅
kΩ
⋅
kΩ
OSC
)
)
4
3
⇒
⇒
) connected between the OSC/FAULT
R
R
OSC
OSC
(
(
kΩ
kΩ
)
)
=
=
----------------------------------------------------------- -
200 kHz
----------------------------------------------------------- -
F
SW
(
(
9.7916 10
11.284 10
kHz
SW
) F
) 200 kHz
–
–
= 200 kHz)
⋅
⋅
SW
4
3
(
(
kHz
L6706
)
)
[
[
kΩ
kΩ
]
]