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參數資料
| 型號： | XC9509H03CAR |
| 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轉換器，配有穩(wěn)壓器并聯(lián)穩(wěn)壓器加電壓檢測器 |
| 文件頁數： | 12/41頁 |
| 文件大?。?/td> | 3619K |
| 代理商： | XC9509H03CAR |
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12/41
XC9509
Series
●
DC/DC Waveform (3.3V, 1.2MHz)(Continued)
5. The IC's DC/DC converter operates in synchronous mode when the coil current is in a continuous state and
non-synchronous mode when the coil current is in a discontinuous state. In order to maintain the load current
value when synchronous switches to non-synchronous and vise versa, a ripple voltage may increase because of
the repetition of switching between synchronous and non-synchronous. When this state continues, the increase in
the ripple voltage stops. To reduce the ripple voltage, please increase the load capacitance value or use a schottky
diode externally. When the current used becomes close to the value of the load current when synchronous
switches to non- synchronous and vise versa, the switching current value can be changed by changing the coil
inductance value. In case changes to coil inductance are to values other than the recommended coil inductance
values, verification with actual components should be done.
Ics = (V
IN
- DC
OUT
) x OnDuty / (L x Fosc)
Ics: Switching current from synchronous rectification to non-synchronous rectification
OnDuty: OnDuty ratio of P-ch driver transistor (
.
=.step down ratio : DC
OUT
/ V
IN
)
L: Coil inductance value
Fosc: Oscillation frequency
ID
OUT
: The DC/DC load current
6. When the XC9509H to L series operate in PWM/PFM automatic switching control mode, the reverse current may
become quite high around the load current value when synchronous switches to non-synchronous and vise versa
(also refer to no. 5 above). Under this condition, switching synchronous rectification and non-synchronous
rectification may be repeated because of the reverse current, and the ripple voltage may be increased to 100mV or
more. The reverse current is the current that flows in the PGND direction through the N-ch driver transistor from
the coil. The conditions, which cause this operation are as follows.
PFM Duty < Step down ratio = DC
OUT
/ V
IN
x 100 (%)
PFM Duty: 30% (TYP.)
Please switch to PWM control via the MODE function in cases where the load current value of the DC/DC converter
is close to synchronous
.
●
DC/DC Waveform (1.8V, 600kHz) @ VIN=6.0V
<External Components>
L
10
μ
H(CDRH5D28C,SUMIDA)
CIN :4.7
μ
F(ceramic)
CL :10
μ
F(ceramic)
Step Down ratio: 1.8V / 6.0V = 30%<PFM Duty 31%>
■
NOTES ON USE (Continued)
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| XC9509H03CDL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509H03CDR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509K033AL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509K033AR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509K033DL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
相關代理商/技術參數 |
參數描述 |
|---|---|
| XC9509H03CDL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509H03CDR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509K | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector |
| XC9509K033AL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509K033AR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
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