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SP7650 Datasheet(PDF) 9 Page - Exar Corporation

Part # SP7650
Description  Buck Regulator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

SP7650 Datasheet(HTML) 9 Page - Exar Corporation

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Date: /5/06
SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator
© Copyright 2006 Sipex Corporation
9
Date: 2/16/06
SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator
© Copyright 2006 Sipex Corporation
APPLICATIONS INFORMATION
The capacitor type suitable for the output capac-
itors can also be used for the input capacitors.
However, exercise additional caution when tanta-
lum capacitors are used. Tantalum capacitors are
known for catastrophic failure when exposed to
surge current, and input capacitors are prone to
such surge current when power supplies are con-
nected “live” to low impedance power sources.
Although tantalum capacitors have been success-
fully employed at the input, it is generally not
recommended.
Loop Compensation Design
The open loop gain of the whole system can be
divided into the gain of the error amplifier,
PWM modulator, buck converter output stage,
and feedback resistor divider. In order to cross
over at the desired frequency cut-off (FCO), the
gain of the error amplifier has to compensate for
the attenuation caused by the rest of the loop at
this frequency. The goal of loop compensation
is to manipulate loop frequency response such
that its crossover gain at 0db results in a slope of
-20db/dec.
The first step of compensation design is to pick
the loop crossover frequency. High crossover
frequency is desirable for fast transient response,
but often jeopardizes the power supply stability.
Crossover frequency should be higher than the
ESR zero but less than 1/5 of the switching
frequency or 60kHz. The ESR zero is contrib-
uted by the ESR associated with the output
capacitors and can be determined by:
ƒZ(ESR) =
1
2 COUT RESR
The next step is to calculate the complex conju-
gate poles contributed by the LC output filter,
ƒP(LC) =
1
2
L COUT
When the output capacitors are of a Ceramic
Type, the SP7650 Evaluation Board requires a
Type III compensation circuit to give a phase
boost of 180° in order to counteract the effects of
an underdamped resonance of the output filter at
the double pole frequency.
SP7650 Voltage Mode Control Loop with Loop Dynamic
(SRz2Cz2+1)(SR1Cz3+1)
(SRESRCOUT+ 1)
[S^2LCOUT+S(RESR+RDC) COUT+1]
VIN
SR1Cz2(SRz3Cz3+1)(SRz2Cp1+1)
VRAMP_PP
VOUT
(Volts)
+
_
VREF
(Volts)
Notes: RESR = Output Capacitor Equivalent Series Resistance.
RDC = Output Inductor DC Resistance.
VRAMP_PP = SP6132 Internal RAMP Amplitude Peak to Peak Voltage.
Condition: Cz2 >> Cp1 & R1 >> Rz3
Output Load Resistance >> RESR & RDC
R2
VREF
(R1 + R2)
or
VOUT
VFBK
(Volts)
Type III Voltage Loop
Compensation
GAMP (s) Gain Block
PWM Stage
GPWM Gain
Block
Output Stage
GOUT (s) Gain
Block
Voltage Feedback
GFBK Gain Block
Definitions:
RESR = Output Capacitor Equivalent Series Resistance
RDC = Output Inductor DC Resistance
RRAMP_PP = SP7650 internal RAMP Amplitude Peak to Peak Voltage
Conditions:
CZ2 >> Cp1 and R1 >> Rz3
Output Load Resistance >>
RESR and RDC


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