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CS51021 データシート(Datasheet) 1 Page - Cherry Semiconductor Corporation

部品番号. CS51021
部品情報  Enhanced Current Mode PWM Controller
ダウンロード  10 Pages
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メーカー  CHERRY [Cherry Semiconductor Corporation]
ホームページ  http://www.cherrycorp.com/
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The CS51021/22/23/24 Fixed
Frequency PWM Current Mode
Controller family provides all neces-
sary features required for AC-DC or
DC-DC primary side control.
Several features are included elimi-
nating the additional components
needed to implement them external-
ly. In addition to low start-up cur-
rent (75µA) and high frequency
operation capability, the CS51021/
22/23/24 family includes overvolt-
age and undervoltage monitoring,
externally programmable dual
threshold overcurrent protection,
current sense leading edge blank-
ing, current slope compensation,
accurate duty cycle control and an
externally available 5V reference.
The CS51021 and CS51023 feature
bidirectional synchronization capa-
bility, while the CS51022 and
CS51024 offer a sleep mode with
100µA maximum IC current con-
sumption. The CS51021/22/23/24
family is available in a 16 lead nar-
row body SO package.
1
Features
VIN (36V to 72V)
51k
0.01µF
470pF
6.98k,
1%
10
6.98k,
1%
PGND
200K,1%
0.1µF
100p
62
IRF6345
100
1µF
10
680pF
10K
1K
180
MOC81025
2K,1%
100µF 100µF
SGND
VOUT
(5V/5A)
22K
5.1K
0.1µF
1000pF
SYNC/SLEEP
2.49K,1%
51K
10K
0.01µF
2K, 1%
1K
330pF
MBRB2060CT
100pF
10
BA521
10K
BAS21
18V
22µF
11V
FZT688
10
4700pF
24.3K
1%
100
TL431
4:1
100:1
2:5
UV
U1
OV
VREF
RTCT
ISET
LGnd
CSS
VFB
COMP
SYNC/
SLEEP
PGnd
SLOPE
VC
VCC
GATE
ISENSE
s
75µA Max. Startup Current
s
Fixed Frequency Current
Mode Control
s
1MHz Switching Frequency
s
Undervoltage Protection
Monitor
s
Overvoltage Protection
Monitor with
Programmable Hysteresis
s
Programmable Dual
Threshold Overcurrent
Protection with Delayed
Restart
s
Programmable Soft Start
s
Accurate Maximum Duty
Cycle Limit
s
Programmable Slope
Compensation
s
Leading Edge Current
Sense Blanking
s
1A Sink/Source Gate Drive
s
Bidirectional Synchronization
(CS51021/23)
s
50ns PWM Propagation
Delay
s
100µA Max Sleep Current
(CS51022/24)
Package Options
Enhanced Current Mode
PWM Controller
CS51021/CS51023
CS51022/CS51024
Description
Typical Application Diagram
1
SS
VREF
OV
SLEEP
or SYNC
VFB
RTCT
VCC
SLOPE
ISET
PGnd
ISENSE
COMP
LGnd
UV
VC
GATE
16 Lead SO Narrow
Device
Sleep/Synch
VCC Start/Stop
CS51021
Synch
8.25V/7.7V
CS51022
Sleep
8.25V/7.7V
CS51023
Synch
13V/7.7V
CS51024
Sleep
13V/7.7V
A
Company
®
36-72V to 5V, 5A DC-DC Convertor
Rev. 2/22/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Consult factory for other package options.




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