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CS2844/D

更新时间： 2024-11-17 23:43:39
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Current Mode PWM Control Circuit with 50% Max Duty Cycle

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CS2844/D 数据手册

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CS2844/CS3844  
CS2845/CS3845  
Current Mode PWM  
Control Circuit  
with 50% Max Duty Cycle  
Description  
Features  
The CS3844/ 45 provides all the neces-  
before the output stage is enabled. In  
the CS2844/ CS3844 turn on occurs at  
16V and turn off at 10V. In the  
CS2845/ CS3845 turn on is at 8.4V and  
turn off at 7.6V.  
Optimized for Offline  
ꢀ
ꢀ
ꢀ
sary features to implement off-line  
fixed frequency current-mode control  
with a minimum number of external  
components.  
Control  
Temp. Compensated  
Oscillator  
50% Max Duty-cycle Clamp  
The CS3844 family incorporates a new  
precision temperature-controlled oscil-  
lator to minimize variations in fre-  
quency. An internal toggle flip-flop,  
which blanks the output every other  
clock cycle, limits the duty-cycle range  
to less than 50%. An undervoltage  
lockout ensures that VREF is stabilized  
Other features include low start-up  
current, pulse-by-pulse current limit-  
ing, and a high-current totem pole out-  
put for driving capacitive loads, such  
as gate of a power MOSFET. The out-  
put is low in the off state, consistent  
with N-channel devices.  
ꢀ V  
Stabilized before  
REF  
Output Stage is Enabled  
ꢀ Low Start-up Current  
ꢀ Pulse-by-pulse Current  
Limiting  
ꢀ Improved Undervoltage  
Lockout  
Absolute Maximum Ratings  
ꢀ Double Pulse Suppression  
ꢀ 1% Trimmed Bandgap Ref.  
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  
ꢀ High Current Totem Pole  
Output  
Package Options  
8 Lead PDIP & SO Narrow  
1
2
3
4
8
7
6
5
COMP  
VFB  
VREF  
VCC  
Wave Solder (through hole styles only) ...................10 sec. max, 260°C peak  
Reflow (SMD styles only) ....................60 sec. max above 183°C, 230°C peak  
Sense  
OSC  
VOUT  
Gnd  
Block Diagram  
14 Lead SO Narrow  
VCC Undervoltage Lock-out  
1
2
3
4
5
6
7
14  
13  
12  
COMP  
VREF  
VCC  
VCC Pwr  
NC  
NC  
VFB  
VCC  
34V  
Set/  
5.0 Volt  
VREF  
Reset Reference  
11 VCC Pwr  
NC  
Gnd  
VFB  
10  
Sense  
NC  
VOUT  
16V/10V  
(8.4V/7.6V)  
Internal  
Bias  
9
Gnd  
Error  
8
OSC  
Pwr Gnd  
Amplifier  
VREF  
R
R
Undervoltage  
Lockout  
-
COMP  
16 Lead SO Wide  
+
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
NC  
NC  
2.50V  
Toggle  
Flip-Flop  
NC  
VREF  
VCC  
VCCPwr  
VO  
NOR  
VOUT  
OSC  
Oscillator  
COMP  
VFB  
S
R
2 R  
Pwr Gnd  
SENSE  
OSC  
NC  
Gnd  
R
1V  
PWM  
Latch  
Current  
Sensing  
Comparator  
Pwr Gnd  
NC  
(
) indicates CS-2845/3845  
Sense  
NC  
ON Semiconductor  
2000 South County Trail, East Greenwich, RI 02818  
Tel: (401)885–3600 Fax: (401)885–5786  
N. American Technical Support: 800-282-9855  
Web Site: www.cherry–semi.com  
June, 1999 - Rev. 2  
1
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