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參數(shù)資料
| 型號： | R1211D104A |
| 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 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大?。?/td> | 385K |
| 代理商： | R1211D104A |
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R1211x
13
(Step3)
When SS reaches 1V, soft-start operation finishes. V
REF
becomes constant voltage (=1V). Then the switching
operation becomes normal mode.
SS
V
FB
,V
REF
DTC
AMPOUT
AMPOUT
SS,V
REF
Step1
Step2
Step3
V
FB
V
OUT
V
IN
<Latch Protection Operation>
The operation of Latch protection circuit is as follows: When AMPOUT becomes "H" and 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 DELAY 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 R1211x002B/D version. Otherwise, make supply voltage down to UVLO detector threshold or lower,
and make it rise up to the normal input voltage.
During the soft-start time, if the duty cycle may be the maximum, protection circuit does not work and DELAY
pin is fixed at GND level.
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".
Output Short
AMPOUT
AMPOUT
DTC
Normal
Latched
Maxduty Operation
EXT
DELAY
V
DLY
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| R12-11D5-24 | 制造商:NTE Electronics 功能描述:POWER RELAY DPDT 24VDC 5A PLUG IN 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 24VDC, 5A, PLUG IN 制造商:NTE Electronics 功能描述:RELAY-5AMP-DC-24V 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 24VDC, 5A, PLUG IN; Relay Type:General Purpose; Coil Voltage VDC Nom:24V; Contact Current Max:5A; Contact Voltage AC Nom:240V; Contact Voltage DC Nom:28V; Coil Resistance:650ohm; Contact Configuration:DPDT ;RoHS Compliant: Yes |
| R1211N002A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC Controller |
| R1211N002A_06 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211N002A-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC Controller |
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