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STEVAL-ISA176V1
ALTAIR05T-800 5 W wide range CV-CC optoless adapter
evaluation board
Data brief
The core of the application is the ALTAIR05T800, the first “all-primary sensing switching
regulator” of the ALTAIR family.
The IC combines a high-performance, lowvoltage PWM controller chip and an 800 V,
avalanche-rugged power MOSFET in the same
package.
The PWM chip is a quasi-resonant (QR) current
mode controller IC specifically designed for QR
ZVS (zero voltage switching at switch turn-on)
flyback converters.
Features
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Universal input mains range: 90 - 264 V AC,
frequency 45-65 Hz
Output voltage: 5 V @ 1 A continuous
operation
Optoless constant voltage - constant current
output regulation
Standby mains consumption: < 100 mW @
230 V AC
Average efficiency: >70%
EMI: in accordance with EN55022-Class-B
RoHS compliant
Description
The STEVAL-ISA176V1 evaluation board
implements a 5 W (5 V / 1 A) wide-range mains
battery charger with constant voltage/constant
current, tailored for AC-DC chargers for mobile
phones and adapters or other hand-held
equipment.
October 2015
The device is capable of providing constant
output voltage (CV) and constant output current
(CC) regulation using primary-sensing feedback.
This eliminates the need for the optocoupler, the
secondary voltage reference and the current
sensor, while still maintaining quite accurate
regulation.
In addition, it is possible to compensate the
voltage drop on the output cable to improve CV
regulation on the externally accessible terminals.
Extremely low consumption under no load
conditions is ensured thanks to controlled burst
mode operation that, along with the built-in high
voltage startup circuit and the low operating
current of the device, helps minimize the residual
input consumption. Although an auxiliary winding
is required in the transformer to correctly perform
CV/CC regulation, the chip can be powered
directly from the rectified mains. This is useful
particularly during CC regulation, where the
flyback voltage is generated by the winding
drops.
DocID028457 Rev 1
For further information contact your local STMicroelectronics sales
office
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www.st.com
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R6
6.2K
22
1W
R1
N.C.
R5
DocID028457 Rev 1
FB/ZCD
2.5V
CDC
-
+
C5
1nF
COMP
C9
100nF
30K
R3
R7
10k
C6
470nF
D2
C2
4.7uF
400V
0
C7
4.7nF
GND
CURRENT
CONTROL
R2
120K
SOURCE
R8
1.2
D7
STTH1L06
C3
1nF
DRAIN
R4
ALTAIR 05
BAT46
IREF
VDD
C4
10uF
C1
4.7uF
400V
470uH
T1
2.2nF - YCap
C10
STPS3L40UF
D7
R9
1.3k
GND
C8
1000uF
Low ESR
5V - 1A
1
AC IN
AC IN
BR
MB6S-RC
L1
Schematic diagram
STEVAL-ISA176V1
Schematic diagram
Figure 1: EVLALTAIR05T-5W circuit schematic
GSPG0710151050SG
STEVAL-ISA176V1
Schematic diagram
Figure 2: Output characteristics
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5
VOUT [V]
4
3
2
115 VAC
230 VAC
1
0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
IOUT [A]
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0.8
0.9
1.0
1.1
GSPG0710151100SG
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Revision history
2
STEVAL-ISA176V1
Revision history
Table 1: Document revision history
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Date
Version
Changes
19-Oct-2015
1
Initial release.
DocID028457 Rev 1
STEVAL-ISA176V1
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DocID028457 Rev 1
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