Document
Additional Resources: Product Page | 3D Model
SERIES: V78-500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
FEATURES
• 0.5 A current output • extremely high efficiency up to 97% • no heat sink required • pin compatible to LM78XX linear regulators • available in straight and right angle SIP packages • low ripple and noise • short circuit protection, thermal shutdown • wide temperature (-40~85°C)
date 06/24/2019 page 1 of 7
RoHS
MODEL
input
voltage
typ (Vdc)
range (Vdc)
V7801-500
12 4.75~26
V78X2-500*
12 4.75~28
V7802-500
12 4.75~28
V7803-500
24 4.75~28
V7805-500
24 6.5~32
V78X6-500
24 8~32
V7809-500
24 11~32
V7812-500
24 15~32
V7815-500
24 18~32
Notes:
1. ripple and noise are measured at 20 MHz BW *. Discontinued model
output voltage
(Vdc) 1.5 1.8 2.5 3.3 5.0 6.5 9.0 12 15
output current
max (mA)
500
500
500
500
500
500
500
500
500
output power
max (W)
0.75
0.9
1.25
1.65
2.5
3.25
4.5
6
7.5
ripple and noise1
max (mVp-p)
35
35
35
35
35
35
35
35
35
efficiency
Vin min (%) 76 79 85 90 93 94 95 95 96
Vin max (%) 66 67 73 80 84 87 91 92 93
PART NUMBER KEY
V78 XX - 500
Base Number
Output Voltage
Output Current
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Additional Resources: Product Page | 3D Model CUI Inc │ SERIES: V78-500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
date 06/24/2019 │ page 2 of 7
INPUT
parameter
operating input voltage
conditions/description
1.5 V output 1.8 V output 2.5 V output 3.3 V output 5 V output 6 V output 9 V output 12 V output 15 V output
OUTPUT
parameter
line regulation
load regulation
voltage accuracy switching frequency temperature coefficient
conditions/description
Vin = min ~ max, at full load
1.5~2.5 V models 3.3~15 V models
measured from 10% load to full load
1.5~2.5 V models 3.3~15 V models
100% load
100% load, input voltage range
PROTECTIONS
parameter short circuit protection thermal shutdown
conditions/description continuous, automatic recovery internal IC junction
SAFETY AND COMPLIANCE
parameter MTBF
conditions/description
RoHS compliant
yes
ENVIRONMENTAL
parameter operating temperature storage temperature case temperature storage humidity temperature rise lead temperature
conditions/description
non-condensing at full load 1.5 mm from case for 10 seconds
min
typ
max
units
4.75 4.75 4.75 4.75 6.5
8 11 15 18
12 12 12 24 24 24 24 24 24
26 Vdc 28 Vdc 28 Vdc 28 Vdc 32 Vdc 32 Vdc 32 Vdc 32 Vdc 32 Vdc
min 280
typ
±0.5 ±0.2
±0.4 ±0.4
±2
330
max
±1.0 ±0.4
±0.75 ±0.6
±3
450
±0.02
units
% %
% %
%
kHz
%/°C
min
typ
max
units
150 °C
min 2,000,000
typ
max
units hours
min
typ
max
units
-40 85 °C
-55 125 °C
100 °C
95 %
25 °C
300 °C
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Additional Resources: Product Page | 3D Model CUI Inc │ SERIES: V78-500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
DERATING CURVES
Load (%)
1. output power vs. ambient temperature
100 80 60 40 20
-40 -20
0 20 40 60 71 85 100
Ambient Temperature (°C)
120
MECHANICAL
parameter dimensions case material weight
conditions/description 0.689 x 0.354 x 0.453 (11.50 x 9.00 x 17.50 mm) plastic (UL94-V0)
MECHANICAL DRAWING
units: mm [inches] tolerance: ±0.25 [±0.010] pin section tolerance: ±0.10 mm [±0.004]
min
date 06/24/2019 │ page 3 of 7
typ
max
units
inch
2.0 g
>@ >@
>@
>@
Front View
Side View
>@ >@
>@
>@
>@
>@ >@ >@
Bottom View
>@
>@
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PIN CONNECTIONS PIN FUNCTION 1 +Vin 2 GND 3 +Vo
Additional Resources: Product Page | 3D Model CUI Inc │ SERIES: V78-500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
TYPICAL APPLICATION CIRCUIT
date 06/24/2019 │ page 4 of 7
1. C1 and C2 are required and should be fitted close to the converter pins 2. For the capatance of C1 and C2, see the external capacitor table. Low ESR types should be chosen 3. C3: a low ESR capacitor is required to keep the noise at the converter to a minimum. Ceramic capacitors are preffered, but tantalum of
low ESR electrolytic capacitors may also suffice; General use 10μF/50V ceramic capacitor. C4 Optional, General use 100μF/25V electrolytic capacitor. 4. No parallel connection or plug and play
TEST CIRCUIT
+
DC Power Source -
Current Meter
Voltage Meter
+Vin
+Vout
Cin DC/DC Converter
GND
0V
1. Cin = 10µF / 50V for 500mA and 22µF / 50V for 1A, Cout = 100µF / 16V. 2. C01 = 10µF / 50V Electrolytic, C02 = 0.1µF / 50V Ceramic. 3. All points labeled A refer to one junction. 4. All points labeled B refer to one junction. 5. Use a short ground loop for probing. Do not use a wired ground clip.
Current Meter
30cm, 18AWG A Cout Twisted B
Voltage Meter
A +A A
C01 + C02
B
BB -
Electronic Load
20MHz Oscilloscope
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Additional Resources: Product Page | 3D Model CUI Inc │ SERIES: V78-500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
date 06/24/2019 │ page 5 of 7
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