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Citizen CLP-621 Technical Manual

Citizen CLP-621
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2-5. Power Supply
2-59 CLP-621 & CLP-631
The following circuit reduces the switching noise. So the output noise and the EMI
(electromagnetic interference) noise are suppressed, and the reversal voltage applied to Q1,
DS2 and DS3 is also reduced.
C13 and R25 connected between drain and source of Q1 / D1, C6, R7 and R5 connected to
the primary winding N1 / C18, C21, R28, FB2 connected to DS3 / C29, C30, R26, FB1
connected to DS2
(2) Driver circuit
The switching FET (Q1) is driven by the control IC (IC1). When power is turned ON, power is
applied to pin 6 (VCC) of IC1 through R3 and R4. Then, the current starts to flow into the
primary winding N2 and voltage is produced there. When the voltage at pin 6 (VCC) reaches
approx. 16V DC, IC1 is activated and a pulse is output from pin 5 (OUT) of IC1 to drive Q1.
When Q1 starts switching, approx. 20-25V DC is supplied from N2 to pin 6 (VCC) of IC1 to
stably activate IC1. During stable oscillation, the switching pulse is continuously output from
pin 5 (OUT) of IC1 to Q1 through R17, R18 and D3. The oscillation frequency is determined by
R12 connected to pin 1 (RT), and the conduction-angle control is made by the control voltage
fed from the secondary circuit to pin 2 (FB) of IC1. The following timing chart shows the control
waveforms at various points.
0V
0V
0A
0A
0V
Vds of Q1
Pin 2 of IC1 (FB)
ID of Q1
Secondary current i
flowing into DS2/DS3
Pin 5 of IC1 (OUT)
Vds: Voltage between the drain and source of Q1
Id: Current flowing in the drain of Q1

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Citizen CLP-621 Specifications

General IconGeneral
USB portNo
RS-232 interfaceYes
Optional connectivityEthernet
USB 1.1 ports quantity1
USB 2.0 ports quantity0
Connectivity technologyWired
Flash memory2 MB
CertificationUL, C-UL, FCC class A, CCC, CE Marking
Internal memory8 MB
Number of fonts2
Built-in barcodesPDF417, UPC-A, UPC-E
Built-in processor32 Bit RISC
Mean cycles between failures (MCBF)1000
Power consumption2400 mA
Power requirements100 - 240V, 50 / 60Hz
Compatible operating systemsWindows 2000, XP, Vista
Core diameter25.4 mm
Ribbon length360 m
Media thickness0.0635 - 0.254 mm
Maximum label length812 m
Maximum roll diameter127 mm
Supported paper width19.5 - 118 mm
Weight and Dimensions IconWeight and Dimensions
Depth114 mm
Width91 mm
Height104 mm

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