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Cherry Semiconductor Corporation

CS52843 Datasheet Preview

CS52843 Datasheet

Current Mode PWM Control Circuit

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CS52843
Current Mode PWM Control Circuit
Description
The CS52843 provides all the nec-
essary features to implement off-
line fixed frequency current-mode
control with a minimum number
of external components.
The CS52843 incorporates a new
precision temperature-controlled
oscillator to minimize variations in
frequency. An undervoltage lock-
out ensures that VREF is stabilized
before the output stage is enabled.
In the CS52843 turn on is at 8.4V
and turn off at 7.6V.
Other features include low start-up
current, pulse-by-pulse current lim-
iting, and a high-current totem pole
output for driving capacitive loads,
such as gate of a power MOSFET.
The output is low in the off state,
consistent with N-channel devices.
Absolute Maximum Ratings
Supply Voltage (ICC<30mA) ..........................................................Self Limiting
Supply Voltage (Low Impedance Source)...................................................30V
Output Current ...............................................................................................±1A
Output Energy (Capacitive Load) .................................................................5µJ
Analog Inputs (VFB, VSENSE)...........................................................-0.3V to 5.5V
Error Amp Output Sink Current...............................................................10mA
Lead Temperature Soldering
Reflow (SMD styles only) ...........60 sec. max above 183°C, 230°C peak
Block Diagram
VCC VCC Undervoltage Lock-out
34V
Gnd
VFB
COMP
OSC
Sense
8.4V/7.6V
Set/ 5.0 Volt
Reset Reference
Error
Amplifier
-
+
2.50V
OUTPUT
R ENABLE
R
Oscillator
2R
R
S
R
1V
Current PWM
Sensing Latch
Comparator
NOR
Internal
Bias
VCC Pwr
VREF
VOUT
Pwr Gnd
Features
s Optimized for Off-line
Control
s Internally Temperature
Compensated Oscillator
s VREF Stabilized before
Output Stage is Enabled
s Very Low Start-up Current
300 µA (typ)
s Pulse-by-pulse Current
Limiting
s Improved Undervoltage
Lockout
s Double Pulse Suppression
s 2% 5 Volt Reference
s High Current Totem Pole
Output
Package Options
8L SO Narrow
COMP 1
VFB 2
8 VREF
7 VCC
Sense 3
6 VOUT
OSC 4
5 Gnd
14L SO Narrow
COMP 1
NC 2
VFB 3
NC 4
Sense 5
NC 6
OSC 7
14 VREF
13 NC
12 VCC
11 VCC Pwr
10 VOUT
9 Pwr Gnd
8 Gnd
Rev. 12/23/97
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
1 A ® Company




Cherry Semiconductor Corporation

CS52843 Datasheet Preview

CS52843 Datasheet

Current Mode PWM Control Circuit

No Preview Available !

Electrical Characteristics: -40 TA 85˚C; VCC = 15V (Note 1); RT = 680; CT = .022µF for triangle mode,
RT = 10k; CT = 3.3nF sawtooth mode unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN TYP MAX
s Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
TJ = 25˚C, IREF = 1mA
12 VCC 25V
1 IRE F20mA
(Note 1)
Line, Load, Temp. (Note 1)
10Hz f 10kHz, TJ = 25˚C (Note 1)
TA = 125˚C, 1000 Hrs. (Note 1)
TA = 25˚C
4.90
4.82
-30
5.00 5.10
6 20
6 25
0.2 0.4
5.18
50
5 25
-100 -180
UNIT
V
mV
mV
mV/˚C
V
µV
mV
mA
s Oscillator Section
Initial Accuracy
Voltage Stability
Temperature Stability
Amplitude
Discharge Current
Sawtooth Mode, TJ = 25˚C (Note 1)
Triangle Mode, TJ = 25˚C
12 VCC 25V
Sawtooth Mode TMIN TA TMAX
Triangle Mode TMIN TA TMAX (Note 1)
VOSC (peak to peak)
TJ = 25˚C
TMIN TA TMAX
47
44
7.3
6.8
52 57 kHz
52 60 kHz
0.2 1.0 %
5%
8%
1.7 V
8.3 9.3 mA
9.8 mA
s Error Amp Section
Input Voltage
Input Bias Current
AVOL
Unity Gain Bandwidth
PSRR
Output Sink Current
Output Source Current
VOUT HIGH
VOUT LOW
VCOMP = 2.5V
VFB = 0V
2 VOUT 4V
(Note 1)
12 VCC 25V
VFB = 2.7V, VCOMP = 1.1V
VFB = 2.3V, VCOMP = 5V
VFB = 2.3V, RL = 15kto Gnd
VFB = 2.7V, RL = 15kto VREF
2.42 2.50 2.58 V
-0.3 -2.0 µA
65 90
dB
0.7 1.0
MHz
60 70
dB
26
mA
-0.5 -0.8
mA
56
V
0.7 1.1 V
s Current Sense Section
Gain
Maximum Input Signal
PSRR
Input Bias Current
Delay to Output
(Notes 2 & 3)
VCOMP = 5V (Note 2)
12 VCC 25V (Note 2)
VSense=0V
TJ=25˚C (Note 1)
2.85 3.00 3.15 V/V
0.9 1.0 1.1 V
70 dB
-2 -10 µA
150 300 ns
s Output Section
Output Low Level
Output High Level
ISINK = 20mA
ISINK = 200mA
ISOURCE = 20mA
ISOURCE = 200mA
0.1 0.4
1.5 2.2
13.0 13.5
12.0 13.5
V
V
V
V
2


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






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