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PDF CS51023 Data sheet ( Hoja de datos )
| Número de pieza | CS51023 | |
| Descripción | Enhanced Current Mode PWM Controller | |
| Fabricantes | Cherry Semiconductor Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CS51023 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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CS51021/CS51023
CS51022/CS51024
Enhanced Current Mode
PWM Controller
Description
Features
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.
Device
CS51021
CS51022
CS51023
CS51024
Sleep/Synch
Synch
Sleep
Synch
Sleep
VCC Start/Stop
8.25V/7.7V
8.25V/7.7V
13V/7.7V
13V/7.7V
Typical Application Diagram
VIN (36V to 72V)
PGND
51k
BAS21
100
1µF
SYNC/SLEEP
11V 22µF
FZT688
18V
0.1µF
200K,1%
10 24.3K
1%
100:1
10K
4:1
0.01µF
4700pF
10K 22K
51K
330pF
0.01µF
VC
VREF
VCC
UV
COMP
OV
VFB
RTCT
ISET
SLOPE
SYNC/
SLEEP
CSS
LGnd U1
GATE
ISENSE
PGnd
2.49K,1%
BA521
10 IRF6345
6.98k, 6.98k, 100
1% 1% 100p 62
470pF
100pF
10
MBRB2060CT
10
680pF
2:5
VOUT
(5V/5A)
100µF 100µF
SGND
0.1µF 5.1K
TL431
1000pF
2K, 1%
180 1K
2K,1%
10K
MOC81025
1K
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
16 Lead SO Narrow
GATE 1
ISENSE
SLEEP
or SYNC
SLOPE
UV
OV
RTCT
ISET
VC
PGnd
VCC
VREF
LGnd
SS
COMP
VFB
36-72V to 5V, 5A DC-DC Convertor
Consult factory for other package options.
Rev. 2/22/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
1 A ® Company
1 page  
PACKAGE PIN #
16L PDIP & SO Narrow
7
8
9
10
11
12
13
14
15
16
Package Pin Description: continued
PIN SYMBOL
FUNCTION
RTCT
ISET
VFB
COMP
SS
LGnd
VREF
VCC
PGnd
VC
Timing resistor RT and capacitor CT determine oscillator frequen-
cy and maximum duty cycle, DMAX.
Voltage at this pin sets pulse-by-pulse overcurrent threshold, and
second threshold (1.33 times higher) with Soft Start retrigger (hic-
cup mode).
Feedback voltage input. Connected to the error amplifier invert-
ing input.
Error amplifier output. Frequency compensation network is usu-
ally connected between COMP and VFB pins.
Charging external capacitor restricts error amplifier output volt-
age during the start or fault conditions (hiccup).
Logic ground.
5.0V reference voltage output.
Logic supply voltage.
Output power stage ground connection.
Output power stage supply voltage.
Block Diagram
VCC
LGnd
SLEEP
SYNC
RTCT
-+
START
STOP
Vcc_OK
4.3V
200ns
VREF = 5V
+
4.75V
OSC
VREF_OK
COMP
VFB
+
2.5V
-
VREF
53µA
SLOPE
ISENSE
Q2
ISET
OV
SS
Clamp
E/A
D2 ISET
Clamp
D3
20k
D1 10k
VFB
Monitor
+
– 2V
×
0.1
×
0.8
∑
G4
0.1V
–+
DISABLE
55ns
Blank
PWM
Comp
VISense
VREF
12.5µA
1.33
×
+
2.5V
–
OV
Monitor
2nd
Threshold
G1
SS
Monitor
Figure 1: CS51021/22/23/24 Block Diagram
VREF
VC
SQ
F1
R
G2
D4
GATE
ZD1
13.5V
PGnd
+
4.7V
–
VREF
55µA
SS
G3
FAULT
Discharge
Latch
UV
Monitor
+
1.45V
–
UV
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet CS51023.PDF ] | |
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