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CS51022AEDR16G データシート(PDF) 9 Page - ON Semiconductor

部品番号 CS51022AEDR16G
部品情報  Enhanced Current Mode PWM Controller
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51022AEDR16G データシート(HTML) 9 Page - ON Semiconductor

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CS51021A, CS51022A, CS51023A, CS51024A
http://onsemi.com
9
Synchronization
A bi−directional synchronization is provided to synchronize
several controllers. When SYNC pins are connected together,
the converters will lock to the highest switching frequency. The
fastest controller becomes the master, producing a 4.3 V, 200
ns pulse train. Only one, the highest frequency SYNC signal,
will appear on the SYNC line.
Sleep
The sleep input is an active high input. The CS51022A/4A
is placed in sleep mode when SLEEP is driven high. In sleep
mode, the controller and MOSFET are turned off. Connect
to GND for normal operation. The sleep mode operates at
VCC
≤ 15 V.
Oscillator and Duty Cycle Limit
The switching frequency is set by RT and CT connected to
the RTCT pin. CT charges and discharges between 3.0 V and
1.5 V.
The maximum duty cycle is set by the ratio of the on time,
tON, and the whole period, T = tON + tOFF. Because the timing
capacitor’s discharge current is trimmed, the maximum duty
cycle is well defined. It is determined by the ratio between the
timing resistor RT and the timing capacitor CT. Refer to figures
6 and 7 to select appropriate values for RT and CT.
fSW +
1
TSW
;TSW + tCH ) tDIS
5
2500
RT (kW)
2000
1500
1000
500
0
100
90
80
70
60
50
40
10
15
20
25
30
35
40
45
50
5
10
15
20
25
30
35
40
45
50
55
RT (kW)
1
2
3
4
5
6
8
7
2
1
3
4
8
7
5
6
1. CT = 47 pF
2. CT = 100 pF
3. CT = 150 pF
4. CT = 220 pF
5. CT = 390 pF
6. CT = 470 pF
7. CT = 560 pF
8. CT = 680 pF
1. CT = 47 pF
2. CT = 100 pF
3. CT = 150 pF
4. CT = 220 pF
5. CT = 390 pF
6. CT = 470 pF
7. CT = 560 pF
8. CT = 680 pF
Figure 6. Frequency vs. RT for Discrete
Capacitor Values
Figure 7. Duty Cycle vs. RT for Discrete
Capacitor Values
ORDERING INFORMATION
Device
Package
Shipping
CS51021AED16
SOIC−16
48 Units / Rail
CS51021AEDR16
2500 Tape & Reel
CS51021AEDR16G
SOIC−16
(Pb−Free)
CS51022ADBG
TSSOP−16*
48 Units / Rail
CS51022ADBR2G
TSSOP−16*
2500 Tape & Reel
CS51022AED16
SOIC−16
48 Units / Rail
CS51022AEDR16
2500 Tape & Reel
CS51022AEDR16G
SOIC−16
(Pb−Free)
CS51023AED16
SOIC−16
48 Units / Rail
CS51023AEDR16
2500 Tape & Reel
CS51023AEDR16G
SOIC−16
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.


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