參數(shù)資料
型號(hào)： R1211D102A
廠商： Ricoh Co., Ltd.
英文描述： STEP-UP DC/DC CONTROLLER
中文描述： 升壓型DC / DC控制器
文件頁(yè)數(shù)： 9/40頁(yè)
文件大?。?/td> 385K
代理商： R1211D102A
R1211x
9
Use a 1
μ
F or more capacitance value of bypass capacitor between V
IN
pin and GND, C1 as shown in the
typical applications above.
In terms of the capacitor for setting delay time of the latch protection, C2 as shown in typical applications of
the previous page, connect between Delay pin and GND pin of the IC with the minimum wiring distance.
Connect a 1
μ
F or more value of capacitor between V
OUT
and GND, C3 as shown in typical applications of the
previous page. (Recommended value is from 10
μ
F to 22
μ
F.) If the operation of the composed DC/DC
converter may be unstable, use a tantalum type capacitor instead of ceramic type.
Connect a capacitor between V
OUT
and the dividing point, C4 as shown in typical applications of the previous
page. The capacitance value of C4 depends on divider resistors for output voltage setting. Typical value is
between 100pF and 1000pF.
Output Voltage can be set with divider resistors for voltage setting, R1 and R2 as shown in typical
applications of the previous page. Refer to the next formula.
Output Voltage = V
FB
×
(R1
+
R2)/R2
R1
+
R2=100k
is recommended range of resistances.
The operation of Latch protection circuit is as follows: When the IC detects maximum duty cycle, charge to
an external capacitor, C2 of DELAY pin starts. And maximum duty cycle continues and the voltage of D
ELAY
pin reaches delay voltage detector threshold, V
DLY
, outputs "L" to EXT pin and turns off the external power
MOSFET.
To release the latch protection operation, make the IC be standby mode with CE pin and make it active in
terms of B/D version. Otherwise, restart with power on.
The delay time of latch protection can be calculated with C2, V
DLY
, and Delay Pin Charge Current, I
DLY1
, as in
the next formula.
t=C2
×
V
DLY
/I
DLY1
Once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and
delay pin outputs "L".
As for R1211x002A/C version, the values and positioning of C4, C5, R3, and R4 shown in the above diagram
are just an example combination. These are for making phase compensation. If the spike noise of V
OUT
may
be large, the spike noise may be picked into V
FB
pin and make the operation unstable. In this case, a resistor
R3, shown in typical applications of the previous page. The recommended resistance value of R3 is in the
range from 10k
to 50k
. Then, noise level will be decreased.
As for R1211x002B/D version, EXT pin outputs GND level at standby mode.
Select the Power MOSFET, the diode, and the inductor within ratings (Voltage, Current, Power) of this IC.
Choose the power MOSFET with low threshold voltage depending on Input Voltage to be able to turn on the
FET completely. Choose the diode with low V
F
such as Shottky type with low reverse current I
R
, and with fast
switching speed. When an external transistor is switching, spike voltage may be generated caused by an
inductor, therefore recommended voltage tolerance of capacitor connected to V
OUT
is three times of setting
voltage or more.
The performance of power circuit with using this IC depends on external components. Choose the most
suitable components for your application.
相關(guān)PDF資料
PDF描述
R1211D102C STEP-UP DC/DC CONTROLLER
R1211D103A STEP-UP DC/DC CONTROLLER
R1211D103C STEP-UP DC/DC CONTROLLER
R1211D104A STEP-UP DC/DC CONTROLLER
R1211N002B STEP-UP DC/DC CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1211D102C 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R1211D103A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R1211D103C 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R1211D104A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R12-11D5-12 制造商:NTE Electronics 功能描述:POWER RELAY DPDT 12VDC 5A PLUG IN 制造商:NTE Electronics 功能描述:General Purpose Relay 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 12VDC, 5A, PLUG IN; Relay Type:General Purpose; Coil Voltage VDC Nom:12V; Contact Current Max:5A; Contact Voltage AC Nom:240V; Contact Voltage DC Nom:28V; Coil Resistance:160ohm; Contact Configuration:DPDT ;RoHS Compliant: Yes
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