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TC38C46COE Datasheet(PDF) 8 Page - TelCom Semiconductor, Inc

No. de pieza TC38C46COE
Descripción Electrónicos  CMOS CURRENT MODE PWM CONTROLLER
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Fabricante Electrónico  TELCOM [TelCom Semiconductor, Inc]
Página de inicio  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC38C46COE Datasheet(HTML) 8 Page - TelCom Semiconductor, Inc

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4-108
TELCOM SEMICONDUCTOR, INC.
CMOS CURRENT MODE
PWM CONTROLLERS
TC18C46
TC28C46
TC38C46
Figure 6. Oscillator Circuit
0.5V 3.5V
ICHARGE
3.5V
RO
8
CT
9
2mA
DISCHARGE
CURRENT
SYNC
10
VDD
3.5V
PIN 8
PIN 10
TCHG
OUTPUT DEAD TIME (TD)
+
RT
TD
1/FO
RT
Selection of Timing Capacitor and Resistor
(CT & RT)
1)
First determine the frequency of operation FO and
the desired " dead" time", TD (see Fig.6 graph).
We need to choose RT and CT.
RT
3)
During discharge (TD), the discharge current pulls
2 m A out of CT, minus the ICHG that keeps trying to
charge it:
2 m A - ICHG = CT
= 3.0 Volts
∆V ,where ∆V= 3.0 Volts
2)
The current mirror in Fig. 6 , shows:
ICHG = 3.5 V
.
Also,
ICHG = CT
Where,
and
∆T = TCHG
∆T
∆T= T
D
3
CT = TD
(.002 - 3.5)
RT
Knowing TD choosing RT permits calculation of CT .
Substituting and rearranging,
∆V
∆V = 3.5 - 0.5
∆T


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