L6756D STMicroelectronics, L6756D Datasheet - Page 29
L6756D
Manufacturer Part Number
L6756D
Description
IC CTLR 2/3/4PH BUCK 40-VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.L6756DTR.pdf
(36 pages)
Specifications of L6756D
Applications
Controller, Intel VR10, VR11, VR11.1
Voltage - Input
12V
Number Of Outputs
4
Voltage - Output
0.3 ~ 1.6 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
40-VFQFN, 40-VFQFPN
Output Voltage
3 V
Input Voltage
- 0.3 V to + 15 V
Switching Frequency
185 KHz to 215 KHz
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6756D
8
Main oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The switching frequency for each
channel, F
side results in being multiplied by N (number of configured phases).
The current delivered to the oscillator may be varied using an external resistor (R
typically connected between the OSC pin and SGND. Since the OSC pin is fixed at 1.24 V,
the frequency is varied proportionally to the current sunk from the pin considering the
internal gain of 10 kHz/μA (See
Connecting R
according to the following relationships:
Figure 13. R
F
SW
=
200kHz
SW
, is internally fixed at 200 kHz: the resulting switching frequency at the load
OSC
OSC
+
--------------------------- - 10
R
to SGND the frequency is increased (current is sunk from the pin),
1.240V
OSC
vs. switching frequency per phase
(
kΩ
)
⋅
kHz
---------- -
μA
Figure
13).
Main oscillator
OSC
)
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