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參數(shù)資料
| 型號： | L491333DIE2V |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 固定正電壓單路輸出標(biāo)準(zhǔn)穩(wěn)壓器 |
| 英文描述： | 3.3 V FIXED POSITIVE REGULATOR, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 539K |
| 代理商： | L491333DIE2V |
RHFL4913 FIXED VERSION
7/13
Overcurrent protection
ISC pin. An internal non-fold back Short-Circuit limitation is set with ISHORT > 3.8A (VO is 0V). This value
can be reduced by an external resistor connected between ISC pin and VI pin, with a typical value range
of 10k
to 200k. This adjustment feature is not available in 3pin packages. To keep excellent VO
regulation, it is necessary to set ISHORT 1.6 times greater than the maximum desired application IO. When
IO reaches ISHORT – 300mA, the current limiter overrules Regulation and VO starts to drop and the OCM
flag is risen. When no current limitation adjustment is required, ISC pin must be left unbiased (as it is in 3
pin packages).
OCM pin
Goes Low when current limiter starts to be active, otherwise VOCM = VI. It is bufferized and can sink 10mA.
OCM pin is internally pulled-up by a 5 k
resistor. Not available in 3pin packages.
Alternate to
RHFL4913 Fixed (& custom) Voltages replace all 3-terminal Industry Devices, providing essential benefits
- Lower Drop-Out
- High radiation performance
- Better SVR
- Saving the high stability external setting resistors.
APPLICATION INFORMATION
The RHFL4913 Fixed Voltage is functional as soon as VI-VO voltage difference is slightly above the power
element saturation voltage. A minimum 0.5mA IO ensures perfect “no-load” regulation.
All available VI pins must always be externally interconnected, same thing for all available VO pins,
otherwise Device stability and reliability cannot be granted. All NC pins can be connected to Ground. The
INHIBIT function switches off the output current in an electronic way, that is very quickly. According to
Lenz’s Law, external circuitry reacts with –LdI/dt terms which can be of high amplitude in case some
series-inductance exists. The effect would be a large transient voltage developed on both Device
terminals. It is necessary to protect the Device with Schottky diodes preventing negative voltage
excursions. In the worst case, a 14V Zener diode shall protect the Device Input.
The Device has been designed for high stability and low drop out operation: Minimum 1F input and
output tantalum capacitors are therefore mandatory. Capacitor ESR range is from 0.5
to over 20 .
Such range turns out to be useful when ESR increases at low temperature. When large transient currents
are expected, larger value capacitors are necessary.
In case of high current operation with expected short-circuit events, caution must be considered relatively
to capacitors. They must be connected as close as possible to device terminals. As some tantalum
capacitors may permanently fail when submitted to high charge-up surge currents, it is recommended to
decouple them with 470nF polyester capacitors.
Being RHFL4913 Fixed Voltage manufactured with very high speed bipolar technology 6GHz fT
transistors), the PCB lay-out must be performed with extreme care, very low inductance, low mutually
coupling lines, otherwise high frequency parasitic signals may be picked-up by the Device resulting into
self-oscillation. User’s benefit is a SVR performance extended to far higher frequencies.
REMOTE SENSING OPERATION
In case the Load is located far from the regulator, it is recommended to comply with the scheme below. To
obtain the best regulation, it is in addition essential to care about:
- The wire connecting R2 to the Load end must not be crossed by the Load current (Kelvin sense).
The noise captured by the wires between the Load and the chip could bring a noisy output voltage. In case
this happens, it is recommended that shielded cables are used for these connections. The external wrap
must be used for connecting the ground of the chip with the Load Ground. It is also recommended to place
1uF tantalum capacitors between Output and Ground close to the device and another next to the Load.
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