参数资料
型号: XC6217A182MR-G
厂商: Torex Semiconductor Ltd
文件页数: 13/32页
文件大小: 0K
描述: IC REG LDO 1.8V .2A SOT-25
特色产品: XC6217 Series Regulators
标准包装: 1
稳压器拓扑结构: 正,固定式
输出电压: 1.8V
输入电压: 最高 6V
电压 - 压降(标准): 0.125V @ 100mA
稳压器数量: 1
电流 - 输出: 200mA(最小)
电流 - 限制(最小): 200mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-25
包装: 标准包装
产品目录页面: 1438 (CN2011-ZH PDF)
其它名称: 893-1081-6
XC6217
Series
■ OPERATIONAL EXPLANATION (Continued)
<C L Auto-Discharge Function>
XC6217 series B/D type can quickly discharge the electric charge at the output capacitor (C L ), when a low signal to the
CE pin, which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor located between the
V OUT pin and the V SS pin (cf. BLOCK DIAGRAM). The C L auto-discharge resistance value is fixed to 780 Ω (V IN =6.0V,
V OUT =4.0V at typical). The discharge time of the output capacitor (C L ) is set by the C L auto-discharge resistance (R) and
the output capacitor (C L ). By setting time constant of a C L auto-discharge resistance value [R DCHG ] and an output
capacitor value (C L ) as τ ( τ =C x R DCHG ), the output voltage after discharge via the N channel transistor is calculated by
the following formulas.
V = V OUT(E) x e –t/ τ , or t= τ In (V OUT(E) /V )
( V : Output voltage after discharge, V OUT(E) : Output voltage, t: Discharge time,
τ : C L auto-discharge resistance R DCHG × Output capacitor (C L ) value C)
<Current Limiter, Short-Circuit Protection>
The XC6217 series’ foldback circuit operates as an output current limiter and a short protection of the output pin. When
the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. As a
result of this drop in output voltage, the foldback circuit operates, output voltage drops further and output current
decreases. When the output pin is shorted to the V SS level, a current of about 30mA flows.
<CE Pin>
The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6217 series. In shutdown mode,
output at the V OUT pin will be pulled down to the VSS level via R1 & R2. However, as for the XC6217 series B/D type, the
C L auto-discharge resistor is connected in parallel to R1 and R2 while the power supply is applied to the V IN pin.
Therefore, time until the V OUT pin reaches the V SS level becomes short. The output voltage becomes unstable, when the
CE pin is open. Please input a certain voltage within an electrical characteristic into CE pin.
If this IC is used with the correct output voltage for the CE pin, the logic is fixed and the IC will operate normally.
However, supply current may increase as a result of through current in the IC's internal circuitry when medium voltage is
input.
■ NOTES ON USE
1. Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be
exceeded.
2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output
current.
Please strengthen V IN and V SS wiring in particular.
3. Please wire the input capacitor (C IN ) and the output capacitor (C L ) as close to the IC as possible.
4. Capacitances of these capacitors (C IN , C L ) are decreased by the influences of bias voltage and ambient
temperature. Care shall be taken for capacitor selection to ensure stability of phase compensation from the point of
ESR influence.
5. When the IC is used under the condition of very small dropout voltage, an output may carry out unstable operation.
Please use it after evaluating enough under the conditions to be used.
6. Torex places an importance on improving our products and their reliability.
We request that users incorporate fail-safe designs and post-aging protection treatment when using Torex products in
their systems.
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