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參數(shù)資料
| 型號(hào)： | XC9511F14SRL |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器內(nèi)置LDO的同時(shí)加電壓檢測(cè)器調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 180K |
| 代理商： | XC9511F14SRL |
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Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
!
OPERATIONAL EXPLANATION (Continued)
< Synchronous / Non-synchronous >
#
Continuous Mode : Synchronous
#
Discontinuous Mode : Non-Synchronous
< Current Limit >
XC9511 Series
The current limiter circuit of the XC9511 series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx
pin, and features a combination of the constant-current type current limit mode and the operation suspension mode.
1
When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the pulses from
the Lx pin at any given timing.
2
When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
3
At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over current state.
4
When the over current state is eliminated, the IC resumes its normal operation.
The IC waits for the over current state to end by repeating the steps
1
through
3
. If an over current state continues for 8msec* and the
above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the driver transistor, and goes into
operation suspension mode. Once the IC is in suspension mode, operations can be resumed by either turning the IC off via the CE pin, or by
restoring power to the VIN pin. The suspension mode does not mean a complete shutdown, but a state in which pulse output is suspended;
therefore, the internal circuitry remains in operation. The constant-current type current limit of the XC9511 series can be set at 1.1A.
.
The XC9511 series automatically switches between synchronous / non-synchronous according to the state of the DC/DC converter.
Highly efficient operations are achievable using the synchronous mode while the coil current is in a continuous state.
The series enters non-synchronous operation when the built-in Nch switching transistor for synchronous operation is shutdown which happens
when the load current becomes low and the operation changes to a discontinuous state.
The IC can operate without an external schottky diode because the parasitic diode in the Nch switching transistor provides the circuit's step-
down operation. However, since Vf of the parasitic diode is a high 0.6V, the efficiency level during non-synchronous operation shows a slight
decrease. Please use an external Schottky diode if high efficiency is required during light load current.
0mA
ILmin
ILmax
Coil Current
LX
Wave Form
ILmax
0mA
Coil Current
LX
Wave Form
*
*
VIN
CE
LX
DCOUT
IDOUT
Current Limit LEVEL
Limit<8mS
Restart
VSS
0mA
Limit>8mS
* 1.2MHz, Typical
Semiconductor Ltd.
Data Sheet
9
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