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UAA2016P Datasheet(PDF) 3 Page - ON Semiconductor

Part # UAA2016P
Description  ZERO VOLTAGE SWITCH POWER CONTROLLER
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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UAA2016
3
MOTOROLA ANALOG IC DEVICE DATA
Load
CF
MAC212A8
Rout
8
5
Rsync
VEE
Vref
Temp. Red.
Rdef
HysAdj
S2
RS
Figure 1. Application Schematic
R1
Synchronization
+
1
S1
R2
4
R3
11–Bit Counter
4–Bit DAC
3
UAA2016
1/2
Failsafe
Pulse
Amplifier
Sampling
Full Wave
Logic
Internal
Reference
Supply
Voltage
2
+VCC
7
Output
6
RS
Sync
+
++
Sense Input
APPLICATION INFORMATION
(For simplicity, the LED in series with Rout is omitted in the
following calculations.)
Triac Choice and Rout Determination
Depending on the power in the load, choose the triac that
has the lowest peak gate trigger current. This will limit the
output current of the UAA2016 and thus its power
consumption. Use Figure 4 to determine Rout according to
the triac maximum gate current (IGT) and the application low
temperature limit. For a 2.0 kW load at 220 Vrms, a good triac
choice is the Motorola MAC212A8. Its maximum peak gate
trigger current at 25
°C is 50 mA.
For an application to work down to – 20
°C, Rout should be
60
Ω. It is assumed that: IGT(T) = IGT(25°C)  exp (–T/125)
with T in
°C, which applies to the MAC212A8.
Output Pulse Width, Rsync
The pulse with TP is determined by the triac’s IHold, ILatch
together with the load value and working conditions
(frequency and voltage):
Given the RMS AC voltage and the load power, the load
value is:
RL = V2rms/POWER
The load current is then:
I
Load +
(Vrms
2
sin(2
pft)–V
TM
) R
L
where VTM is the maximum on state voltage of the triac, f is
the line frequency.
Set ILoad = ILatch for t = TP/2 to calculate TP.
Figures 6 and 7 give the value of TP which corresponds to
the higher of the values of IHold and ILatch, assuming that
VTM = 1.6 V. Figure 8 gives the Rsync that produces the
corresponding TP.
RSupply and Filter Capacitor
With the output current and the pulse width determined as
above, use Figures 9 and 10 to determine RSupply, assuming
that the sinking current at Vref pin (including NTC bridge
current) is less than 0.5 mA. Then use Figure 11 and 12 to
determine the filter capacitor (CF) according to the ripple
desired on supply voltage. The maximum ripple allowed is
1.0 V.
Temperature Reduction Determined by R1
(Refer to Figures 13 and 14.)


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