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參數(shù)資料
| 型號(hào)： | TC2117 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | D10 - BACKSHELL ENVIRON EMI-RFI 90 DEG M |
| 中文描述： | 800mA的低壓差固定正穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大小： | 447K |
| 代理商： | TC2117 |
TC2117
DS21665B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC2117 is a precision, positive output LDO. Unlike
bipolar regulators, the TC2117 supply current does not
increase proportionally with load current. In addition,
V
OUT
remains stable and within regulation over the
entire 0mA to 800mA operating load range.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
Output Capacitor
A 1
μ
F (min) capacitor from V
OUT
to ground is required.
The output capacitor should have an effective series
resistance of 0.2
to 10
. A 1
μ
F capacitor should be
connected from V
IN
to GND if there is more than 10
inches of wire between the regulator and the AC filter
capacitor, or if a battery is used as the power source.
Aluminum electrolytic or tantalum capacitor types can
be used. (Since many aluminum electrolytic capacitors
freeze at approximately -30°C, solid tantalums are rec-
ommended for applications operating below -25°C.)
When operating from sources other than batteries, sup-
ply noise rejection and transient response can be
improved by increasing the value of the input and output
capacitors and employing passive filtering techniques.
3.2
Thermal Considerations
3.2.1
THERMAL SHUTDOWN
Integrated thermal protection circuitry shuts the regula-
tor off when die temperature exceeds 160°C. The reg-
ulator remains off until the die temperature drops to
approximately 150°C.
3.2.2
POWER DISSIPATION
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output
current. The following equation is used to calculate
worst case actual power dissipation:
EQUATION 3-1:
The
(Equation 3-2) is a function of the maximum ambient
temperature (T
A
MAX
), the maximum allowable die tem-
perature (125°C) and the thermal resistance from
junction-to-air (
θ
JA
).
maximum
allowable
power
dissipation
EQUATION 3-2:
Table 3-1 shows various values of
θ
JA
for the TC2117
mounted on a 1/16 inch, 2-layer PCB with 1 oz. copper
foil.
TABLE 3-1:
THERMAL RESISTANCE
GUIDELINES FOR TC2117 IN
3-PIN SOT-223 PACKAGE
C1
1
μ
F
Battery
TC2117
V
IN
V
OUT
C2
1
μ
F
GND
V
OUT
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board Area
Thermal
Resistance
2500 sq mm
1000 sq mm
225 sq mm
100 sq mm
1000 sq mm
1000 sq mm
*Tab of device attached to topside copper.
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
0 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
1000 sq mm
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
Where:
P
D
= Worst case actual power dissipation
V
IN
MAX
= Maximum voltage on V
IN
V
OUT
MIN
= Maximum regulator output voltage
I
LOAD
MAX
= Maximum output (load) current
P
D
MAX
=T
J
MAX
– T
A
MAX
θ
JA
Where all terms are previously defined.
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