XC9510 TOREX SEMICONDUCTOR LTD., XC9510 Datasheet - Page 11

• Manufacturer Part Number: XC9510
• Description: Xc9510 Synchronous Step-down Dc/dc Converter With Built-in Ldo Regulator In Series Plus Voltage Detector
• Manufacturer: TOREX SEMICONDUCTOR LTD.

■NOTES ON USE
■OPERATIONAL EXPLANATION (Continued)
●Application Information
●Voltage Detector
1. The XC9510 series is designed for use with ceramic output capacitors. If, however, the potential difference between
2.
3. When the difference between V
4. When the difference between V
The detector block of the XC9510 series detects output voltage from the VD
VR
< CE / MODE Pin Function>
The operation of the XC9510 series' DC/DC converter block and voltage regulator block will enter into the shut down
mode when a low level signal is input to the CE/MODE pin. During the shut down mode, the current consumption occurs
only in the detector and is 3.0μA (TYP.), with a state of high impedance at the Lx pin and DC
operation by inputting a high level signal or a middle level signal to the CE/MODE pin. The input to the CE/MODE pin is
a CMOS input and the sink current is 0μA (TYP.). The operation of the XC9510D to F series' voltage detector block will
enter into stand-by mode when a high level signal is input to the CE/MODE pin. The voltage regulator block will operate
when a middle level signal is input. But when a low level signal is input, the voltage regulator block will enter into
stand-by mode. With the XC9510H to L series control can be PWM control when the CE/MODE pin is 'M' level and
PWM/PFM automatic switching control when the CE/MODE pin is 'H' level.
OUT
dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching
energy and oscillation could occur on the output. If the input-output potential difference is large, connect an
electrolytic capacitor in parallel to compensate for insufficient capacitance.
component selection, such as the coil inductance, capacitance values, and board layout of external components. Once the design
has been completed, verification with actual components should be done.
is the possibility that some cycles may be skipped completely.
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by external
●DC/DC Waveform (3.3V, 1.2MHz)
internally. (N-channel Open Drain Type)
< External Components>
L:4.7μH(CDRH4D28C,SUMIDA)
CIN:4.7μF(ceramic)
CL:10μF(ceramic)
IN
IN
and V
and V
OUT
OUT
is small, and the load current is heavy, very wide pulses will be outputted
is large in PWM control, very narrow pulses will be outputted, and there
OUT
< External Components>
L:4.7μH(CDRH4D28C,SUMIDA)
CIN:4.7μF(ceramic)
CL:10μF(ceramic)
pin while sensing either V
OUT
pin. The IC starts its
DD
, DC
XC9510
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OUT
Series
, or