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UCSR3654SL-D07-T Fiches technique(PDF) 7 Page - Unisonic Technologies

No de pièce UCSR3654SL-D07-T
Description  HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
Download  9 Pages
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Fabricant  UTC [Unisonic Technologies]
Site Internet  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UCSR3654SL-D07-T Fiches technique(HTML) 7 Page - Unisonic Technologies

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UCSR3654S
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 9
www.unisonic.com.tw
QW-R129-009.a
OPERATION DESCRIPTION (Cont.)
Constant Current Operation
When the sampled voltage is below 2.0V reference voltage and the error amplifier output reaches its maximum,
thus UTC UCSR3654S operates in constant-current (CC) mode. The CC point and maximum output power can be
externally adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller
output power becomes.
IOUT
VOUT
Large
Rcs
Small
Rcs
Figure 3. Adjustable output power by changing RCS
Figure 4. Secondary current waveform
In CC operation, the CC loop control function of UTC UCSR3654S will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
2
1
=
Tsw
Tdemag
(2)
Thus the output current is given by:
PK
PK
OUT
I
S
N
P
N
4
1
Tsw
Tdemag
I
S
N
P
N
2
1
I
(3)
Programmable Cable Drop Compensation
UTC UCSR3654S has a built-in cable voltage drop compensation to achieve good load regulation. An offset
voltage is generated at INV pin by an internal current flowing into the resistor divider. The current is inversely
proportional to the voltage of COMP pin. As a result, it is inversely proportional to the output load current. The
voltage drop across the cable is compensated by this offset voltage at INV pin. It can also be programmed by
adjusting the resistance of the divider to compensate the drop for various cable lines used.


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