CS51021 Cherry Semiconductor Corporation, CS51021 Datasheet

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CS51021

Manufacturer Part Number
CS51021
Description
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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SYNC/SLEEP
36-72V to 5V, 5A DC-DC Convertor
Rev. 2/22/99
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
V
IN
0.01µF
(36V to 72V)
PGND
CS51021
CS51022
CS51023
CS51024
Device
10K
330pF
51K
4700pF
11V
51k
0.01µF
22K
FZT688
22µF
V
V
SLEEP
V
COMP
R
SYNC/
C
LGnd
C
FB
REF
T
SS
C
T
U1
Typical Application Diagram
10
SLOPE
Enhanced Current Mode
I
GATE
SENSE
PGnd
18V
V
I
OV
UV
SET
CC
10K
BAS21
Description
470pF
0.1µF
Sleep/Synch
Synch
Synch
24.3K
1%
Sleep
Sleep
6.98k,
1%
10
PWM Controller
6.98k,
200K,1%
2.49K,1%
1%
1K
100
IRF6345
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.
BA521
100p
1µF
100
MOC81025
180
62
CS51021/CS51023
CS51022/CS51024
10K
100:1
TL431
1K
10
100pF
0.1µF
4:1
1000pF
5.1K
V
2K,1%
MBRB2060CT
CC
8.25V/7.7V
8.25V/7.7V
13V/7.7V
13V/7.7V
680pF
10
1
Start/Stop
2K, 1%
100µF 100µF
2:5
SGND
V
(5V/5A)
OUT
2000 South County Trail, East Greenwich, RI 02818
Consult factory for other package options.
Tel: (401)885-3600 Fax: (401)885-5786
or SYNC
Cherry Semiconductor Corporation
SLOPE
SLEEP
I
Web Site: www.cherry-semi.com
SENSE
GATE
75µA Max. Startup Current
Fixed Frequency Current
Mode Control
1MHz Switching Frequency
Undervoltage Protection
Monitor
Overvoltage Protection
Monitor with
Programmable Hysteresis
Programmable Dual
Threshold Overcurrent
Protection with Delayed
Restart
Programmable Soft Start
Accurate Maximum Duty
Cycle Limit
Programmable Slope
Compensation
Leading Edge Current
Sense Blanking
1A Sink/Source Gate Drive
Bidirectional Synchronization
50ns PWM Propagation
Delay
100µA Max Sleep Current
R
Package Options
Email: info@cherry-semi.com
I
T
SET
OV
UV
C
16 Lead SO Narrow
(CS51021/23)
(CS51022/24)
T
Features
1
A
V
PGnd
V
V
LGnd
SS
COMP
V
®
C
CC
REF
FB
Company

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CS51021 Summary of contents

Page 1

... 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 ...

Page 2

... Lead Temperature Soldering: Reflow (SMD styles only).............................................60 sec. max above 183°C, 230°C peak Electrical Characteristics: Unless otherwise stated, specifications apply for -40°C < < V PARAMETER Under Voltage Lockout START Threshold (CS51021/22) START Threshold (CS51023/24) STOP Threshold Hysteresis (CS51021/22) Hysteresis (CS51023/24 Startup (CS51021/22 Startup (CS51023/24 Operating (CS51021/23 Operating (CS51022/24) CC ...

Page 3

... Temperature Stability Min Charge & Discharge Time Duty Cycle Accuracy Peak Voltage Valley Voltage Valley Clamp Voltage Discharge Current Discharge Current Synchronization (CS51021/23) Input Threshold Output Pulsewidth Output High Voltage Input Resistance Drive Delay Output Drive Current SLEEP (CS51022/24) SLEEP Input Threshold ...

Page 4

... Charge Current Discharge Current Charge Voltage Discharge Voltage Note 1: Guaranteed by Design, not 100% tested in production. PACKAGE PIN # 16L PDIP & SO Narrow 1 GATE 2 I SENSE 3 SYNC (CS51021/23) 3 SLEEP (CS51022/24) 4 SLOPE < 20V, 8.2V < V < 20V TEST CONDITIONS SLOPE = 2V ...

Page 5

... SENSE 0 SET V REF 12.5µA OV Figure 1: CS51021/22/23/24 Block Diagram Package Pin Description: continued C Timing resistor and maximum duty cycle, D Voltage at this pin sets pulse-by-pulse overcurrent threshold, and second threshold (1.33 times higher) with Soft Start retrigger (hic- cup mode). ...

Page 6

... CC portion of the IC. The internal logic monitors the supply voltage During abnormal operating conditions, the CC output is held low. The CS51021/22/23/24 requires only 75µA of startup current. Voltage Feedback The output voltage is monitored via the V compared with the internal 2.5V reference. The error amplifier output minus one diode drop is divided by 3 and connected to the negative input of the PWM compara- tor ...

Page 7

PWM comparator is a combination of these two voltages. The slope compensation, lated using the following formula: dV 53µA SLOPE = 0.1 × should be noted that internal capacitance of the IC will ...

Page 8

It is determined by the ratio between the timing resistor R T tor C . Refer to figures 5 and 6 to select appropriate values T ...

Page 9

... Max 16L SO Narrow 10.00 1.27 (.050) 0.40 (.016) REF: JEDEC MS-012 Ordering Information Part Number Description CS51021ED16 16L SO Narrow CS51021EDR16 16L SO Narrow (tape & reel) CS51022ED16 16L SO Narrow CS51022EDR16 16L SO Narrow (tape & reel) CS51023ED16 16L SO Narrow CS51023EDR16 16L SO Narrow (tape & reel) CS51024ED16 ...

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