L6731BTR STMicroelectronics, L6731BTR Datasheet - Page 19
L6731BTR
Manufacturer Part Number
L6731BTR
Description
IC CTRLR ADJ STEP DOWN 16-TSSOP
Manufacturer
STMicroelectronics
Datasheet
1.L6731BTR.pdf
(24 pages)
Specifications of L6731BTR
Applications
Controller, DDR
Voltage - Input
1.8 ~ 14 V
Number Of Outputs
1
Voltage - Output
Adjustable down to 0.6V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5099-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6731B
6.3
6.4
Figure 11. Compensation Network
Input capacitors
The input capacitors have to sustain the RMS current flowing through them, that is:
Where D is the duty cycle. The equation reaches its maximum value, I
losses in worst case are:
Compensation network
The loop is based on a voltage mode control
internal/external reference voltage and scaled by the external resistor divider. The error
amplifier output V
width modulated (PWM) with an amplitude of V
by the output filter. The modulator transfer function is the small signal transfer function of V
V
and a zero at FESR depending on the output capacitor's ESR. The DC Gain of the modulator is
simply the input voltage V
COMP
. This function has a double pole at frequency F
COMP
is then compared with the oscillator triangular wave to provide a pulse-
IN
divided by the peak-to-peak oscillator voltage: V
Irms
P
ESR
Iout
0 (
5 .
(Figure
D
IN
Iout
1 ( D
at the PHASE node. This waveform is filtered
)
18.). The output voltage is regulated to the
2
LC
)
depending on the L-C
OUT
/2 with D = 0.5. The
OSC
Application details
OUT
.
resonance
19/24
OUT
/