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CS51221EDTB16G

P1-P3P4-P6P7-P9P10-P12P13-P14
© Semiconductor Components Industries, LLC, 2005
September, 2005 − Rev. 8
1 Publication Order Number:
CS51221/D
CS51221
Enhanced Voltage Mode
PWM Controller
The CS51221 fixed frequency feed forward voltage mode PWM
controller contains all of the features necessary for basic voltage mode
operation. This PWM controller has been optimized for high
frequency primary side control operation. In addition, this device
includes such features as: Soft−Start, accurate duty cycle limit control,
less than 50mA startup current, over and undervoltage protection, and
bidirectional synchronization. The CS51221 is available in a 16 lead
SOIC narrow surface mount package.
Features
• 1.0 MHz Frequency Capability
• Fixed Frequency Voltage Mode Operation, with Feed Forward
• Thermal Shutdown
• Undervoltage Lock−Out
• Accurate Programmable Max Duty Cycle Limit
• 1.0 A Sink/Source Gate Drive
• Programmable Pulse−By−Pulse Overcurrent Protection
• Leading Edge Current Sense Blanking
• 75 ns Shutdown Propagation Delay
• Programmable Soft−Start
• Undervoltage Protection
• Overvoltage Protection with Programmable Hysteresis
• Bidirectional Synchronization
• 25 ns GATE Rise and Fall Time (1.0 nF Load)
• 3.3 V 3% Reference Voltage Output
• Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
V
FB
I
SET
1
CS51221
AWLYWW
16
COMPR
T
C
T
SSOV
LGNDUV
V
REF
FF
V
CC
SYNC
PGNDI
SENSE
V
C
GATE
PIN CONNECTIONS AND
MARKING DIAGRAM
1
16
http://onsemi.com
Device Package Shipping
†
ORDERING INFORMATION
CS51221ED16 SOIC−16 48 Units / Rail
CS51221EDR16 SOIC−16
2500 Tape & Re
el
CS51221EDR16G SOIC−16
(Pb−Free)
2500 Tape & Re
el
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
s
Brochure, BRD8011/D.
CS51221ED16G SOIC−16
(Pb−Free)
48 Units / Rail
CS51221EDTB16G TSSOP−16
(Pb−Free)
96 Units / Rail
CS51221EDTB16R2G TSSOP−16
(Pb−Free)
SOIC−16
D SUFFIX
CASE 751B
1
16
TSSOP−16
DTB SUFFIX
CASE 948F
CS51221= Specific Device Code
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G = Pb−Free Package
CS51
221
ALYWG
1
16
2500 Tape & Re
el
CS51221
http://onsemi.com
2
Figure 1. Application Diagram, 36 V−72 V to 5.0 V/5.0 A Converter
UV
OV
I
SET
FF
GATE
I
SENSE
PGND
V
C
V
REF
COMP
V
FB
R
T
C
T
SYNC
SS
LGND
CS51221
V
CC
0.01 mF
330 pF
2200 pF
1.0 mF
10 k 200
0.22 mF
FZT688
51 k
11 V
V
IN
(36 V to 72 V)
22 mF
18 V
160 k
10
0.1 mF
470 pF
24.3 k
20.25 k
510 k
4.3 k
13 k
10
62
5.6 k
150
4700 pF
1.0 k
10 k
IRF634
10
100 pF
10
680 pF
D13
V33MLA1206A23
MBRB2545CT
T3
100:1
T1
4:1
T2
2:5
100
BAS21
1.0 mF
100 mF
V
OUT
(5.0 V/5.0 A)
SGND
180 1.0 k
TL431
0.1 mF
5.1 k
2.0 k
2.0 k
D11
BAS21
MOC81025
CS51221
http://onsemi.com
3
MAXIMUM RATINGS
Rating Value Unit
Operating Junction Temperature, T
J
Internally
Limited
−
Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) 230 peak °C
Storage Temperature Range, T
S
−65 to +150 °C
ESD (Human Body Model) 2.0 kV
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. 60 second maximum above 183°C.
MAXIMUM RATINGS
Pin Name Pin Symbol V
MAX
V
MIN
I
SOURCE
I
SINK
Gate Drive Output GATE 15 V −0.3 V 1.0 A Peak, 200 mA DC 1.0 A Peak, 200 mA DC
Current Sense Input I
SENSE
6.0 V −0.3 V 1.0 mA 1.0 mA
Timing Resistor/Capacitor R
T
C
T
6.0 V −0.3 V 1.0 mA 10 mA
Feed Forward FF 6.0 V −0.3 V 1.0 mA 25 mA
Error Amp Output COMP 6.0 V −0.3 V 10 mA 20 mA
Feedback Voltage V
FB
6.0 V −0.3 V 1.0 mA 1.0 mA
Sync Input SYNC 6.0 V −0.3 V 10 mA 10 mA
Undervoltage UV 6.0 V −0.3 V 1.0 mA 1.0 mA
Overvoltage OV 6.0 V −0.3 V 1.0 mA 1.0 mA
Current Set I
SET
6.0 V −0.3 V 1.0 mA 1.0 mA
Soft−Start SS 6.0 V −0.3 V 1.0 mA 10 mA
Logic Section Supply V
CC
15 V −0.3 V 10 mA 50 mA
Power Section Supply V
C
15 V −0.3 V 10 mA 1.0 A Peak, 200 mA DC
Reference Voltage V
REF
6.0 V −0.3 V lnternally Limited 10 mA
Power Ground PGND N/A N/A 1.0 A Peak, 200 mA DC N/A
Logic Ground LGND N/A N/A N/A N/A
ELECTRICAL CHARACTERISTICS (−40°C < T
A
< 85°C; −40°C < T
J
< 125°C; 3.0 V < V
C
< 15 V; 4.7 V < V
CC
< 15 V;
R
T
= 12 k; C
T
= 390 pF; unless otherwise specified.)
Characteristic
Test Conditions Min Typ Max Unit
Start/Stop Voltages
Start Threshold
− 4.4 4.6 4.7 V
Stop Threshold − 3.2 3.8 4.1 V
Hysteresis Start−Stop 400 850 1400 mV
I
CC
@ Startup V
CC
< UVL Start Threshold − 38 75
mA
Supply Current
I
CC
Operating − − 9.5 14 mA
I
C
Operating 1.0 nF Load on GATE − 12 18 mA
I
C
Operating No Switching − 2.0 4.0 mA
P1-P3P4-P6P7-P9P10-P12P13-P14

CS51221EDTB16G

Mfr. #:
Buy CS51221EDTB16G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers ANA PWM CTR TSSOP
Lifecycle:
New from this manufacturer.
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