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参数资料
| 型号： | CS5205-3GDPR3 |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| 封装： | D2PAK-3 |
| 文件页数： | 5/7页 |
| 文件大小： | 160K |
| 代理商： | CS5205-3GDPR3 |
5
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
The capacitor value and type is based on cost, availability,
size and temperature constraints. A tantalum or aluminum
electrolytic capacitor is best, since a film or ceramic capaci-
tor with almost zero ESR, can cause instability. The alu-
minum electrolytic capacitor is the least expensive solu-
tion. However, when the circuit operates at low tempera-
tures, both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturers data sheet pro-
vides this information.
A 22F tantalum capacitor will work for most applications,
but with high current regulators such as the CS5205-X the
transient response and stability improve with higher val-
ues of capacitor. The majority of applications for this regu-
lator involve large changes in load current so the output
capacitor must supply the instantaneous load current. The
ESR of the output capacitor causes an immediate drop in
output voltage given by:
V = I × ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum and
ceramic capacitors in parallel. This reduces the overall ESR
and reduces the instantaneous output voltage drop under
load transient conditions. The output capacitor network
should be as close as possible to the load for the best results.
When large external capacitors are used with a linear regu-
lator it is sometimes necessary to add protection diodes. If
the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator.
The discharge current depends on the value of the capaci-
tor, the output voltage and the rate at which VIN drops. In
the CS5205-X family of linear regulators, the discharge
path is through a large junction and protection diodes are
not usually needed. If the regulator is used with large val-
ues of output capacitance and the input voltage is instanta-
neously shorted to ground, damage can occur. In this case,
a diode connected as shown in Figures 2a and 2b is recom-
mended.
Figure 2a. Protection diode scheme for adjustable output regulator.
Figure 2b. Protection diode scheme for fixed output regulators.
Since the CS5205-X is a three terminal regulator, it is not
possible to provide true remote load sensing. Load regula-
tion is limited by the resistance of the conductors connect-
ing the regulator to the load. For best results the fixed reg-
ulators should be connected as shown in Figure 3.
Figure 3. Conductor parasitic resistance can be minimized with the
above grounding scheme for fixed output regulators.
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of
the regulator as shown in Figure 4. If R1 is connected to the
load, RC is multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes
RC ×
()
RC = conductor parasitic resistance
Figure 4. Grounding scheme for the adjustable output regulator to min-
imize parasitics.
VOUT
RC
VIN
conductor parasitic
resistance
CS5205-1
VIN
Adj
RLOAD
R1
R2
R1 + R2
R1
VOUT
RC
VIN
conductor parasitic
resistance
CS5205-X
VIN
Gnd
RLOAD
Output Voltage Sensing
VOUT
VIN
CS5205-X
VIN
Gnd
VOUT
C2
C1
IN4002
(optional)
VOUT
VIN
CS5205-1
VIN
Adj
R1
R2
C1
VOUT
C2
CAdj
IN4002
(optional)
Protection Diodes
Stability Considerations
Applications Information: continued
CS5205-1,-3,-5
相关PDF资料 |
PDF描述 |
|---|---|
| CS5205-3GDP3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| CS5205-3GT3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5205-5GT3 | 5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5208-1GT3 | 1.25 V-5 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5411-4 | Optoelectronic |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5205-3GT3 | 功能描述:IC REG LDO 3.3V 5A TO220AB RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| CS-5205-3T3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| CS5205-5 | 制造商:CHERRY 制造商全称:CHERRY 功能描述:5A Adjustable, and 3.3V and 5V Fixed Linear Regulators |
| CS5205-5GT3 | 功能描述:IC REG LDO 5V 5A TO220AB RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| CS-5205-5T3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
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