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부품번호 | CS8156YTVA5 기능 |
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기능 | 12V/ 5V Low Dropout Dual Regulator with ENABLE | ||
제조업체 | Cherry Semiconductor Corporation | ||
로고 | |||
전체 8 페이지수
CS8156
12V, 5V Low Dropout Dual Regulator
with ENABLE
Description
Features
The CS8156 is a low dropout 12V/5V
dual output linear regulator. The 12V
± 5% output sources 750mA and the 5V
±2.0% output sources 100mA.
The on board ENABLE function con-
trols the regulatorÕs two outputs. When
the ENABLE lead is low, the regulator
is placed in SLEEP mode. Both outputs
are disabled and the regulator draws
only 200nA of quiescent current.
The regulator is protected against over-
voltage conditions. Both outputs are
protected against short circuit and ther-
mal runaway conditions.
The CS8156 is packaged in a 5 lead
TOÐ220 with copper tab. The copper
tab can be connected to a heat sink if
necessary.
s Two regulated outputs
12V ±5.0%; 750mA
5V ±2.0%; 100mA
s Very low SLEEP mode
current drain 200nA
s Fault Protection
Reverse Battery
Absolute Maximum Ratings
+60V, -50V Peak
Transient Voltage
Input Voltage
Operating Range .....................................................................-0.5V to 26V
Peak Transient Voltage (Load Dump = 46V) ....................................60V
Internal Power Dissipation ..................................................Internally Limited
Operating Temperature Range................................................-40¡C to +125¡C
Junction Temperature Range...................................................-40¡C to +150¡C
Storage Temperature Range ....................................................-65¡C to +150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only)..........10 sec. max, 260¡C peak
Short Circuit
Thermal Shutdown
s CMOS Compatible
ENABLE
Package Options
VIN
ENABLE
Block Diagram
+
Pre-Regulator
-
+
-
Anti-Saturation
and
Current Limit
VOUT2, 5V
5 Lead TO-220
Tab (Gnd)
VOUT1, 12V
Gnd
Over Voltage
Shutdown
Bandgap
Reference
+
Anti-Saturation
and
Current Limit
-
Thermal
Shutdown
1 VIN
2 VOUT1
3 Gnd
1 4 ENABLE
5 VOUT2
Rev. 2/19/98
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
1 A ¨ Company
Typical Performance Characteristics: continued
Line Transient Response (VOUT1)
Line Transient Response (VOUT2)
20
IOUT1 = 500mA
10
0
-10
-20
3
2
1
0
0 10 20 30 40 50 60
TIME (ms)
10
5 IOUT2 = 100mA
0
-5
-10
3
2
1
0
0 10 20 30 40 50 60
TIME (ms)
Load Transient Response (VOUT1)
150
100
50
0
-50
-100
-150
0.8
0.6
0.4
0.2
0
0 10 20 30 40 50 60
TIME (ms)
Load Transient Response (VOUT2)
150
100
50
0
-50
-100
-150
20
15
10
5
0
0 10 20 30 40 50 60
TIME (ms)
Maximum Power Dissipation (TO-220)
20
18
16
14
12
10
8
6
4
2
0
0
INFINITE
HEAT SINK
10°C/W HEAT SINK
NO HEAT SINK
10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (°C)
4
Quiescent Current vs Output Current for VOUT2
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
No Load on 5V
100 200
VIN = 14V
300 400 500
125ûC
25ûC
-40ûC
600 700 800
Output Current (mA)
4페이지 Application Notes
Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that
cause the greatest oscillation. This represents the worst
case load conditions for the output at low temperature.
Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage conditions.
Step 5: If the capacitor is adequate, repeat steps 3 and 4
with the next smaller valued capacitor. A smaller capaci-
tor will usually cost less and occupy less board space. If
the output oscillates within the range of expected operat-
ing conditions, repeat steps 3 and 4 with the next larger
standard capacitor value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Remove the unit from the environmental chamber
and heat the IC with a heat gun. Vary the load current as
instructed in step 5 to test for any oscillations.
Once the minimum capacitor value with the maximum
ESR is found for each output, a safety factor should be
added to allow for the tolerance of the capacitor and any
variations in regulator performance. Most good quality
aluminum electrolytic capacitors have a tolerance of +/-
20% so the minimum value found should be increased by
at least 50% to allow for this tolerance plus the variation
which will occur at low temperatures. The ESR of the
capacitors should be less than 50% of the maximum allow-
able ESR found in step 3 above.
Repeat steps 1 through 7 with C3, the capacitor on the
other output.
Calculating Power Dissipation
in a Dual Output Linear Regulator
The maximum power dissipation for a dual output regula-
tor (Figure 1) is:
PD(max) = {VIN(max)ÐVOUT1(min)}IOUT1(max)+
{VIN(max)ÐVOUT2(min)}IOUT2(max)+VIN(max)IQ
(1)
Where:
VIN(max) is the maximum input voltage,
VOUT1(min) is the minimum output voltage from VOUT1,
VOUT2(min) is the minimum output voltage fromVOUT2,
IOUT1(max) is the maximum output current for the appli-
cation,
IOUT2(max) is the maximum output current for the appli-
cation, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
IIN
VIN
Smart
Regulator
}Control
Features
IQ
IOUT1
IOUT2
VOUT1
VOUT2
Figure 1: Dual output regulator with key performance parameters
labeled.
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages
with RQJA's less than the calculated value in equation 2
will keep the die temperature below 150¡C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
Heat Sinks
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed
to determine the value of RQJA:
RQJA = RQJC + RQCS + RQSA
(3)
where
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheatsink thermal resistance, and
RQSA = the heatsinkÐtoÐambient thermal resistance.
RQJC appears in the package section of the data sheet. Like
RQJA, it too is a function of package type. RQCS and RQSA
are functions of the package type, heatsink and the inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
Test & Application Circuit
C1*
0.1mF
VIN VOUT1
CS8156
ENABLE
+ C2**
22mF
Once the value of PD(max) is known, the maximum permis-
sible value of RQJA can be calculated:
RQJA =
150¡C - TA
PD
(2)
Gnd
NOTES:
* C1 required if regulator is located far
from power supply filter.
** C2, C3 required for stability.
7
VOUT2
+ C3**
22mF
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
CS8156YTVA5 | 12V/ 5V Low Dropout Dual Regulator with ENABLE | Cherry Semiconductor Corporation |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |