ON Semiconductor CS51227 Technical data
查询CS51227供应商
CS51227
Enhanced Voltage Mode
PWM Controller
The CS51227 is a fixed frequency, single output PWM controller
using feed forward voltage mode control. Feed forward control
provides superior line regulation and line transient response. This
PWM controller has been optimized for high frequency primary side
control operation. It has undervoltage lockout with 4.7 V start up
voltage and 75 µA start up current. One external capacitor can
program the switching frequency up to 1.0 MHz. The protection
features include pulse–by–pulse current limit with leading edge
blanking and thermal shutdown. The CS51227 is available in 8 lead
SO narrow surface mount package.
http://onsemi.com
8
1
SO–8
D SUFFIX
CASE 751
Features
• 1.0 MHz Frequency Capability
• 4.7 V Start–Up Voltage
• Fixed Frequency Voltage Mode Operation with Feed Forward
• Undervoltage Lockout
• 75 µA Start–Up Current
• Thermal Shutdown
• 1.0 A Sink/Source Gate Drive
• Pulse–By–Pulse Current Limit with Leading Edge Blanking
• 50 ns GATE Rise and Fall Time (1.0 nF Load)
• Maximum Duty Cycle Over 85%
• Programmable Volt–Second Clamp
PIN CONNECTIONS AND
MARKING DIAGRAM
1
GATE
SENSE
CT
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
Device Package Shipping
CS51227ED8 SO–8 95 Units/Rail
CS51227EDR8 SO–8
ALYW
8
51227
V
CC
GNDI
COMPFF
V
FB
2500 Tape & Reel
Semiconductor Components Industries, LLC, 2001
April, 2001 – Rev. 7
1 Publication Order Number:
CS51227/D
5.0 V
6.8 µH
FS70VSJ–03
0.1
B320DICT
GATE
CS51227
V
CC
12 V/ 2.0 A
0.1 µF
1.0 k
GND
COMP
CS51227
V
FB
2700 pF
100 pF
9.1 k
5.6 nF
51 k
+
22 µF × 4
300
+
22 µF × 2
9.31 k
0.025
330 pF1.0 nF
I
SENSE
FF
CT
110
GND
GND
Figure 1. Applications Diagram, 5.0 V to 12 V/2.0 A Boost Converter
MAXIMUM RATINGS*
Rating Value Unit
Operating Junction Temperature, T
Storage Temperature Range, T
J
S
ESD Susceptibility (Human Body Model) 2.0 kV
Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) 230 peak °C
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
150 °C
–65 to +150 °C
MAXIMUM RATINGS
Pin Name Pin Symbol V
Gate Drive Output GATE 20 V –0.3 V 1.0 A Peak, 200 mA DC 1.0 A Peak, 200 mA DC
Current Sense Input I
Timing Capacitor CT 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
Power Supply V
Ground GND N/A N/A 1.0 A Peak, 200 mA DC N/A
SENSE
FB
CC
MAX
V
MIN
I
SOURCE
I
SINK
6.0 V –0.3 V 1.0 mA 1.0 mA
6.0 V –0.3 V 1.0 mA 1.0 mA
20 V –0.3 V 10 mA 1.0 A Peak, 200 mA DC
http://onsemi.com
2
CS51227
ELECTRICAL CHARACTERISTICS: (–40°C < T
C
= 390 pF; unless otherwise specified.)
T
Characteristic
< 85°C, –40°C < TJ < 125°C, 4.7 V < VCC < 18 V
A
Test Conditions Min Typ Max Unit
Start/Stop Voltages
Start Threshold – 4.4 4.5 4.7 V
Stop Threshold – 3.2 3.8 4.2 V
Hysteresis Start – Stop 300 700 1400 mV
ICC @ Startup VCC < UVL Start Threshold – 38 75 µA
Supply Current
ICC Operating No Load – 10 16 mA
Overcurrent Protection
Overcurrent Threshold Ramp I
I
to GATE Delay VFB = 0.5 V (no blanking) – 60 125 ns
SENSE
SENSE
0.27 0.30 0.33 V
Error Amp
Reference Voltage VFB connected to COMP 1.234 1.263 1.285 V
VFB Input Current VFB = 1.25 V – 1.3 2.0 µA
Open Loop Gain Note 2 60 90 – dB
Unity Gain Bandwidth Note 2 1.5 2.5 – MHz
COMP Sink Current COMP = 1.4 V, VFB = 1.45 V 3.0 12 32 mA
COMP Source Current COMP = 1.4 V, VFB = 1.15 V 1.0 1.7 2.4 mA
COMP High Voltage VFB = 1.15 V 2.8 3.1 3.4 V
COMP Low Voltage VFB = 1.45 V 75 150 300 mV
PSRR Freq = 120 Hz, Note 2 60 85 – dB
Oscillator
Frequency Accuracy – 200 235 270 kHz
Max Duty Cycle – 85 90 95 %
Peak Voltage Note 2 1.99 2.05 2.11 V
Valley Clamp Voltage – 0.90 0.95 1.00 V
Valley Voltage Note 2 0.90 0.95 1.00 V
Discharge Current – 0.85 1.00 1.15 mA
Charge Current – 95 115 135 µA
Gate Driver
High Saturation Voltage VCC – V
Low Saturation Voltage V
GATE
, VCC = 10 V, I
GATE
, I
= 150 mA – 1.2 1.5 V
SINK
= 150 mA – 1.5 2.0 V
SOURCE
High Voltage Clamp – 11 13.5 16 V
Output UVL Leakage V
= 0 V – 1.0 50 µA
GATE
Rise Time 1.0 nF Load, VCC = 18 V, 1.0 V < VO < 9.0 V – 32 50 ns
Fall Time 1.0 nF Load, VCC = 18 V, 9.0 V < VO < 1.0 V – 25 50 ns
Max GATE Voltage @ UVL I
= 100 µA 0.4 0.7 1.5 V
LOAD
2. Guaranteed by design, not 100% tested in production.
http://onsemi.com
3
Loading...