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MAX1820 Folha de dados(PDF) 3 Page - Maxim Integrated Products

Nome de Peças MAX1820
Descrição Electrónicos  MAX1820 Evaluation Kit
Download  6 Pages
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Fabricante Electrônico  MAXIM [Maxim Integrated Products]
Página de início  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1820 Folha de dados(HTML) 3 Page - Maxim Integrated Products

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MAX1820 Evaluation Kit
_______________________________________________________________________________________
3
Operating Mode (Top and Bottom Circuits)
The MAX1820 EV kit provides a jumper-selectable
operating mode feature. Jumpers JU2 and JU5 select
the operating mode for the top and bottom circuits,
respectively. Options include Low-Noise Forced PWM
mode and Normal mode. Table 2 lists the jumper
options.
Caution: Do not connect an external controller to the
SHDN pad while a shunt is on jumper JU1 or JU4 since
the external controller may be damaged.
Clock Select (Top and Bottom Circuits)
The MAX1820 EV kit features a selectable clock input.
The MAX1820/MAX1821’s internal clock can operate the
EV kit or the EV kit can be synchronized to an external
clock when evaluating the MAX1820X, MAX1820Y, and
MAX1821X. The 2-pin jumpers JU3 and JU6 determine
the top and bottom circuits’ operating clock, respective-
ly. Table 3 lists the selectable jumper options.
The sine-wave generator should provide the following
signal qualities:
• Output Voltage = 0.2VP-P to 0.8VP-P with approxi-
mately 1VDC offset
• Output Frequency = 10MHz to 16MHz (MAX1820X
and MAX1821X)
• Output Frequency = 15MHz to 21MHz (MAX1820Y)
• Duty Cycle = 40% to 60%
Evaluating Other Output Voltages
(Bottom Circuit)
The MAX1821 buck switching-regulator output is set to
+1.5V by feedback resistors (R3, R4). To generate out-
put voltages other than +1.5V (+1.25V to +5.5V), select
different external voltage-divider resistors (R3, R4).
Refer to the Setting the Output Voltages section in the
MAX1821 data sheet for instructions on selecting the
resistors. The minimum input voltage must be +150mV
above the selected output voltage at VOUT to avoid
possible dropout conditions.
Variable Output Voltage (Top Circuit)
The MAX1820 EV kit top circuit uses the MAX1820Z IC
and features a dynamically variable output voltage in
the +0.4V to +3.4V range. An external voltage refer-
ence source must be connected to the top circuit’s volt-
age reference (REF) BNC connector. The reference
source can be an external voltage reference or the out-
put of a DAC. The range of the voltage reference is
+0.227V to +1.932V. This reference voltage range will
provide an output voltage in the +0.4V to +3.4V range
at VOUT. The output voltage (VOUT) settles within 30µs
when changing VREF. When VIN is equal or lower than
the desired VOUT, the MAX1820 operates at 100% duty
cycle and VOUT will track VIN.
SHUNT
LOCATION
SKIP PIN
OPERATING MODE
1, 2
Connected to VIN
Forced PWM mode:
PWM operation at all
loads
2, 3
Connected to
GND
Normal mode: pulse
skipping at light load
and PWM at heavy
load
Table 2. Jumpers JU2 and JU5 Functions
SHUNT
LOCATION
SYNC PIN
OPERATING MODE
Installed
Connected to VIN
Internal 1MHz clock
used
None
Connected to
SYNC pad
through C4, C8
External 13MHz sine-
wave generator used
to synchronize
internal clock
Table 3. Jumpers JU3 and JU6 Functions


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