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TOP224Y Datasheet(PDF) 3 Page - Power Integrations, Inc.

Part No. TOP224Y
Description  Three-terminal Off-line PWM Switch
Download  21 Pages
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TOP224Y Datasheet(HTML) 3 Page - Power Integrations, Inc.

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TOP221-227
D
7/01
3
TOPSwitch-II Family Functional Description
TOPSwitch is a self biased and protected linear control current-
to-duty cycle converter with an open drain output.
High
efficiency is achieved through the use of CMOS and integration
of the maximum number of functions possible. CMOS process
significantly reduces bias currents as compared to bipolar or
discrete solutions.
Integration eliminates external power
resistors used for current sensing and/or supplying initial start-
up bias current.
During normal operation, the duty cycle of the internal output
MOSFET decreases linearly with increasing CONTROL pin
current as shown in Figure 4. To implement all the required
control, bias, and protection functions, the DRAIN and
CONTROL pins each perform several functions as described
below. Refer to Figure 2 for a block diagram and to Figure 6 for
timing and voltage waveforms of the TOPSwitch integrated
circuit.
PI-2040-050197
DMAX
DMIN
IC (mA)
2.0
6.0
Slope = PWM Gain
IB
ICD1
Auto-restart
Figure 4. Relationship of Duty Cycle to CONTROL Pin Current.
DRAIN
0
VIN
VC
0
4.7 V
5.7 V
8 Cycles
95%
5%
Off
Switching
Switching
Off
IC
Charging CT
ICD1
Discharging CT
ICD2
Discharging CT
IC
Charging CT
Off
PI-1956-092496
DRAIN
0
VIN
VC
0
4.7 V
5.7 V
Off
Switching
(b)
(a)
CT is the total external capacitance
connected to the CONTROL pin
Figure 5. Start-up Waveforms for (a) Normal Operation and (b) Auto-restart.


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