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MIC21LV32 Datasheet(PDF) 22 Page - Microchip Technology

Part No. MIC21LV32
Description  36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC21LV32 Datasheet(HTML) 22 Page - Microchip Technology

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MIC21LV32
DS20006513A-page 22
 2021 Microchip Technology Inc.
4.4
Ripple Injection Circuit
Components Selection
Follow the steps below for selecting the ripple injection
circuit components if low-ESR output capacitors are used.
The below procedures provide a good starting point for
selecting the ripple injection components. Final values
should be confirmed by laboratory measurements.
1.
Calculate the product of RINJ and CFF for a given
injected Feedback Ripple Voltage, ΔVFB, using
the equation below. Choose ΔVFB in the range of
40 mV to 500 mV. A good starting point for ΔVFB
is 50 mV.
EQUATION 4-4:
2.
Choose CFF in the range of 0.47 nF to 10 nF.
3.
Calculate RINJ using the equation above.
4.
Calculate the Top Feedback Resistor, RFB(TOP),
value using the equation below:
EQUATION 4-5:
5.
Calculate Bottom Feedback Resistor, RFB(BOT),
value using the equation below:
EQUATION 4-6:
6.
Estimate the crossover frequency using the
equation below. If fCO(EST) is above fSW/5, lower
the CFF value and repeat procedure 6.
EQUATION 4-7:
7a) Select CINJ using the below equation if fCO(EST)
calculated above meets Equation 5-11.
EQUATION 4-8:
Add a resistor in parallel with the soft start capacitor con-
nected to the SS pin if CINJ > CFF × (RFB(TOP)/RFB(BOT)).
This ensures that there is no overshoot at the end of the
soft start. Use Equation 4-9 below to select the parallel
resistor value.
EQUATION 4-9:
7b) Select CINJ using the below guidelines if
fCO(EST) is low (typically below fSW/15).
Calculate the maximum Equivalent Series
Resistance (ESR) of the output capacitor using
Equation 4-10.
EQUATION 4-10:
Calculate the output capacitance using Equation 4-11.
EQUATION 4-11:
Calculate CINJ using Equation 4-12.
EQUATION 4-12:
Using too low a CINJ may result in oscillations at the
beginning of the soft start. These oscillations can be
reduced either by using a higher CINJ or COUT, by
reducing the feedback ripple.
Where:
ΔVFB = Injected Feedback Ripple Voltage
RINJ × CFF =
500
VFB
Where:
fLC = LC Resonant Frequency = 1/(2 xx sqrt
(L x COUT)
RFB(TOP)
1
2 × π × CFF × 0.8 × fLC
Where:
VOUT = Target Output Voltage
VREF = Reference Voltage = 0.6V for MIC21LV32
RFB(BOT) =
RFB(TOP)
VOUT
VREF
– 1
[]
Where:
L = Inductance
COUT = Output Capacitance
VOUT = Output Voltage
fSW = Switching Frequency
fCO(EST) =
RINJ × CFF
π × L × COUT
VOUT × 106
fSW
×
CINJ
1
0.8 × RINJ × fCO(EST)
Where:
ISS = Soft Start Current Source = 1.2 µA
RSS
0.8V
ISS
Where:
ΔILOAD_STEP = Magnitude of the Load Transient
ΔVOUT_TRANS = Acceptable Output Voltage Deviation
during Load Transient
ESRCOUT
VOUT_TRANS
ILOAD_STEP
COUT
1
π × fCO × ESRCOUT
CINJ = CFF ×
ESRCOUT
2 × π × fCO × L
VOUT
5V × 100 ns × fSW
×


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