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CS52843 Datasheet

Current Mode PWM Control Circuit

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CS52843
Current Mode
PWM Control Circuit
The CS52843 provides all the necessary features to implement
offline fixed frequency currentmode control with a minimum
number of external components.
The CS52843 incorporates a new precision temperaturecontrolled
oscillator to minimize variations in frequency. An undervoltage
lockout ensures that VREF is stabilized before the output stage is
enabled. In the CS52843 turn on is at 8.4 V and turn off at 7.6 V.
Other features include low startup current, pulsebypulse current
limiting, and a highcurrent totem pole output for driving capacitive
loads, such as gate of a power MOSFET. The output is low in the off
state, consistent with Nchannel devices.
Features
Optimized for OffLine Control
Internally Temperature Compensated Oscillator
VREF Stabilized before Output Stage is Enabled
Very Low StartUp Current 300 μA (typ)
PulsebyPulse Current Limiting
Improved Undervoltage Lockout
Double Pulse Suppression
2.0% 5.0 Volt Reference
High Current Totem Pole Output
http://onsemi.com
8
1
SO8
D SUFFIX
CASE 751
14
1
SO14
D SUFFIX
CASE 751A
PIN CONNECTIONS AND
MARKING DIAGRAMS
COMP 1
VFB
Sense
OSC
VREF
VCC
VOUT
GND
1
COMP
NC
VFB
NC
Sense
NC
OSC
14
VREF
NC
VCC
VCC Pwr
VOUT
Pwr GND
GND
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
Package
Shipping
CS52843ED8
CS52843EDR8
CS52843ED14
CS52843EDR14
SO8
SO8
SO14
SO14
95 Units/Rail
2500 Tape & Reel
55 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 4
1
Publication Order Number:
CS52843/D


  ON Semiconductor Electronic Components Datasheet  

CS52843 Datasheet

Current Mode PWM Control Circuit

No Preview Available !

CS52843
VCC VCC Undervoltage Lockout
VCC Pwr
34 V
GND
VFB
COMP
OSC
Sense
8.4 V/7.6 V
Set/
Reset
5.0 Volt
Reference
Error
Amplifier
2.50 V
Oscillator
R
OUTPUT
ENABLE
R
2R
R
S
1.0 V
Current
Sensing
Comparator
R
PWM
Latch
NOR
Internal Bias
VREF
VOUT
Pwr GND
Figure 1. Block Diagram
MAXIMUM RATINGS*
Rating
Supply Voltage (ICC < 30 mA)
Supply Voltage (Low Impedance Source)
Output Current
Output Energy (Capacitive Load)
Analog Inputs (VFB, VSENSE)
Error Amp Output Sink Current
Lead Temperature Soldering:
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
Reflow: (SMD styles only) (Note 1)
Value
Self Limiting
30
±1.0
5.0
0.3 to 5.5
10
230 peak
Unit
V
A
μJ
V
mA
°C
http://onsemi.com
2


Part Number CS52843
Description Current Mode PWM Control Circuit
Maker ON Semiconductor
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CS52843 Datasheet PDF






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