V7812-500-SMT [CUI]
DC switching regulator, non-isolated; DC开关稳压器，非隔离
| 型号： | V7812-500-SMT |
| 厂家： | 
CUI INC |
| 描述： | DC switching regulator, non-isolated |
| 文件： | 总5页 (文件大小：494K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
page 1 of 5
date 04/2009
PART NUMBER: V78XX-500-SMT
DESCRIPTION: DC switching regulator, non-isolated
features
description
·efficiency up to 96%
·no need for heatsinks
·wide input range
The V78XX series of switching regulators is
designed as a drop in replacement for 78XX
linear regulators. Because the V78XX series
features high efficiency under all line
conditions, there is no need for a heatsink.
Built-in short-circuit and over-temperature
protections ensure very rugged operations.
Additionally, low ripple and noise
·short circuit protection
·thermal shutdown
·low ripple and noise
·non-isolated
performance makes the parts useful in a wide
range of applications.
MODEL
input voltage
input voltage
range
4.5~28 V dc
6~28 V dc
14~28 V dc
17~28 V dc
output voltage
output voltage
output
current
500 mA
500 mA
500 mA
500 mA
efficiency
nominal
nominal
range
1.8~5.5 V dc
2.5~8 V dc
4.5~13.5 V dc
4.5~15.5 V dc
Vin_min
Vin_max
75%
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
12
12
24
24
3.3
5
12
15
90%
94%
95%
96%
81%
90%
92%
notes
1. Vin-Vo>2V, If needed to adjust the output voltage .
2. If the input voltage is above specified then permanent damage may be caused to the device.
3. V7812-500-SMT and V7815-500-SMT are not allowed to operate under no load.
OUTPUT SPECIFICATIONS
item
conditions
min.
typ.
2
max.
3
unit
%
output voltage accuracy
at 100% load
line regulation
load regulation
output ripple
Vin = min. to max. at full load
10% to 100% full load
20 MHz bandwidth, output w/ 10μF cap
0.2
0.3
10
0.5
0.75
25
%
%
mVp-p
short circuit protection
output current limit
dynamic load stability
quiescent current
thermal shutdown
temperature coefficient
max load capacitance
continuous, auto recovery upon removal of short
1800
30
15
mA
mV
mA
°C
%/°C
μF
100%<->10% load
normal input (3.3, 5 V output)
75
160
-40°C ~ 85°C ambient
0.02
1000
GENERAL SPECIFICATIONS
item
conditions
min.
typ.
max.
unit
On/Off control current
on: open or 1.5<Vc≤5V
off: GND or 0V<Vc<1V
On/Off shutdown threshold voltage
shutdown input current
operating temperature range
operating case temperature
storage temperature range
cooling
1.1
-40
-55
1.25
15
1.4
30
85
100
125
V
μA
°C
°C
°C
see derating curve
free air convection
solderability
storage humidity
case material
1.5 mm from case for 10 seconds
relative humidity, non-condensing
plastic (UL94-V0)
260
95
°C
%
MTBF
at 25°C per MIL-HDBK-217F
2,000,000
hours
package weight
2.3
grams
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page 2 of 5
date 04/2009
PART NUMBER: V78XX-500-SMT
DESCRIPTION: DC switching regulator, non-isolated
MECHANICAL DRAWINGS
(Side View)
2.54 [0.100]
1.80 [0.071]
10
1
9
7
6
5
A
2.54 [0.100]
0.25 [0.010]
2.54 [0.100]
1.00 [0.039]
A
10 9
7 6
(Top View)
FOOTPRINT DETAILS
5°
1
5
1.13 [0.044]
Pin
1
Function
Vin
10.16[0.400]
15.24 [0.600]
GND
7,9
5
Note:
Vout
Unit:mm[inch]
6
Vadj
Pin tolerances: 0.10mm[ 0.004inch]
General tolerances: 0.25mm[ 0.010inch]
10
ON/OFF
PACKAGING DIMENSIONS
Taping dimension:
∅1.50 [0.059]
1.75 [0.069]
11.50 [0.453]
2.00 [0.079]
0.50 [0.020]
14.70 [0.579]
10.20[0.402]
12.40 [0.488]
∅1.50 [0.059]
7.65 [0.301]
16.00 [0.630]
Taping reel dimension:
29.40 [1.157]
∅100.00[3.937]
5.60 [0.220]
Note:
Unit :mm[inch]
General tolerances: 0.50mm[ 0.020inch]
L=530mm[20.866inch] Tube Quantity: 33pcs
L=220mm[8.661inch] Tube Quantity: 13pcs
∅
13.00 [0.512]
∅
21.50 [0.846]
Note:
Unit :mm[inch]
General tolerances: 0.50mm[ 0.020inch]
Devices per reel quantity:500pcs
THERMAL DERATING CURVE
SOLDER REFLOW PROFILE
250
Temperature Derating Graph
Peak.Temp 240 C
10Sec Max
220 C
200
90 Sec Max
(>220 C)
150
100
50
0
Operating Temp.(
C )
Time (sec.)
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page 3 of 5
date 04/2009
PART NUMBER: V78XX-500-SMT
DESCRIPTION: DC switching regulator, non-isolated
TYPICAL APPLICATION CIRCUIT
Choose a ceramic type capacitors; C3 is require ,for best performance , use a 100 F or more capacitor please.
Vin
1
5
Vout
V78XX-500-SMT
10
7,9
6
R 1
R 2
C2
C 3
F
C1
106K/50V
100
226K/25V
ON /OF F
C5
470p F
GND
GND
1. C1,C2: Use ceramic capacitors; C3: Use a 100 µF or more capacitor.
2. C1,C2 are required and should be placed close to the pins of the converter, with shortest possible leads.
3. No parallel connection or plug and play.
EXTERNAL CAPACITOR TABLE
Part
Number
C1
C2
(ceramic capacitor) (ceramic capacitor)
10uF/50V
10uF/50V
10uF/50V
10uF/50V
22uF/16V
22uF/16V
10uF/25V
10uF/25V
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
OUTPUT TRIMMING
Trim Down
R1(KΩ)
Trim Up
R2(KΩ )
Vo nom
Part Name
75.10-10*Vo
Vo-3.3
91.52-10*Vo
Vo-5.0
287.02-20*Vo
Vo-12
269.37-15*Vo
Vo-15
61*Vo-75.10
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
3.3V
5.0V
12V
=
=
=
3.3-Vo
61*Vo-91.52
5.0-Vo
71*Vo-287.02
12-Vo
=
=
=
66*Vo-269.37
15-Vo
=
=
15V
To trim the output of the device input the desired output voltage (Vo) into the proper equation.
R1 trims the output voltage down and R2 trims the voltage up. If not using the trim feature
place a 470pF ceramic capacitor between pin 6 and GND. Make sure that the desired output
voltage is within the trim range.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page 4 of 5
date 04/2009
PART NUMBER: V78XX-500-SMT
DESCRIPTION: DC switching regulator, non-isolated
TEST CIRCUIT
1) Efficiency and Output Voltage Ripple Test
25.4mm
25.4mm
12.7mm
+Vout
Vin
DC/DC
Copper strip
5
1
Converter
1
F
10
F
7 9
6
C1
Tantalum Scope
Ceramic
C3
C2
470pF
Ceramic
C5
GND
Copper strip
2) Start-up and Load Transient Response Test
50.8 mm
+Vout
Vin
DC/DC
Converter
Copper strip
5
1
7 9
6
C1
Scope
C2 C3
470pF
C5
Ceramic
GND
Copper strip
EFFICIENCY AND RIPPLE
Efficiency(%)
Ripple (mV)
45
100
90
80
70
60
50
40
30
20
10
0
40
35
30
25
20
15
10
5
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
0
Load (mA)
20 50 80 120 160 200 240 280 320 360 400 440 480 500 550
Load (mA)
20 50 80 120 160 200 240 280 320 360 400 440 480 500 550
Efficiency VS Output Load (Vin=Norm)
Output Voltage Ripple VS Output Load (Vin=Norm)
Efficiency(%)
100
Ripple (mV)
45
40
35
30
25
20
15
10
5
95
90
85
80
75
70
65
60
55
50
45
40
V7803-500-SMT
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
0
4.5
6
8
10 12 14 16 17 20 22 24 26 28
Vin(V)
Vin (V)
10 12 14 16 17 20 22 24 26 28
4.5
6
8
Efficiency VS Input Voltage (Full Load)
Output Voltage Ripple VS Input Voltage (Full Load)
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page 5 of 5
date 04/2009
PART NUMBER: V78XX-500-SMT
DESCRIPTION: DC switching regulator, non-isolated
SHUTDOWN CONTROL
The ON/OFF pin provides several features for adjusting and sequencing the power supply, a user has the flexibility of using the ON/OFF pin as:
1) A digital on/off control by pulling down the ON/OFF pin with an open-drain transistor.
ON/OFF
2) Line UVLO. If desired to achieve a UVLO voltage, a resistor divider from Vin to ON/OFF to GND can be used to disable the converter until
a higher input voltage is achieved. For example, it is not useful for a converter with 12V output to start up with a 12V input , as the
output cannot each regulation. To enable the converter when the input voltage reaches 14V, a 51kΩ/5kΩ voltage divider from Vin to GND
can be connected to the ON/OFF pin. Both the precision 1.25V threshold and 150mV hysteresis are multiplied by the resistor ratio,
providing a proportional 12% hysteresis for any startup threshold. So, the turn off threshold would be between 12.3V to 15.7V.
Vin
+Vout
V78XX-500-SMT
5
1
51KΩ
5KΩ
10
7,9
6
100
F
C1
470pF
GND
3) Power supply sequencing. By connecting a small capacitor from ON/OFF to GND, the 2 A current source and 1.25V threshold can provide
a stable and predictable delay between startup of multiple power supplies. For example, a startup delay of roughly 64mS is provided using
100nF, and roughly 136mS by using 200nF.
Vin
+Vout
V78XX-500-SMT
5
1
7,9
10
C5
6
C1
100 F
470pF
100nF
GND
CH1: Von/off
CH2: Vo
Delay time: 64mS
Vin
+Vout
V78XX-500-SMT
5
1
10 7,9
C5
6
C1
100 F
470pF
200nF
GND
CH1: Von/off
CH2: Vo
Delay time: 136mS
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
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