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CS2845 데이터시트 PDF




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부품번호 CS2845 기능
기능 Current Mode PWM Control Circuit
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CS2845 데이터시트, 핀배열, 회로
CS2844, CS3844, CS2845,
CS3845
Current Mode PWM
Control Circuit with
50% Max Duty Cycle
The CS3844/45 provides all the necessary features to implement
off–line fixed frequency current–mode control with a minimum
number of external components.
The CS3844 family incorporates a new precision
temperature–controlled oscillator to minimize variations in frequency.
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 before the output stage is
enabled. In the CS2844/CS3844 turn on occurs at 16 V and turn off at
10 V. In the CS2845/CS3845 turn on is at 8.4 V and turn off at 7.6 V.
Other features include low start–up current, pulse–by–pulse current
limiting, 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.
Features
Optimized for Off–Line Control
Temp. Compensated Oscillator
50% Max Duty–Cycle Clamp
VREF Stabilized Before Output Stage Is Enabled
Low Start–Up Current
Pulse–By–Pulse Current Limiting
Improved Undervoltage Lockout
Double Pulse Suppression
1.0% Trimmed Bandgap Reference
High Current Totem Pole Output
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MARKING
DIAGRAMS
8
8
1
8
1
14
1
16
1
DIP–8
N SUFFIX
CASE 626
SO–8
D SUFFIX
CASE 751
CSx84yN
AWL
YYWW
1
8
384yD
ALYW
SO–14
D SUFFIX
CASE 751A
1
14
CSx84yD14
AWLYWW
1
16
SO–16L
DW SUFFIX
CASE 751G
CSx84yDW
AWLYYWW
1
x = 2 or 3
y = 4 or 5
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2001
June, 2001 – Rev. 3
1
Publication Order Number:
CS2844/D




CS2845 pdf, 반도체, 판매, 대치품
CS2844, CS3844, CS2845, CS3845
ELECTRICAL CHARACTERISTICS (continued) (–25° ≤ TA 85° for CS2844/2845, 0° ≤ TA 70° for CS3844/CS3845.
VCC = 15 V*; RT = 10 k, CT = 3.3 nF for sawtooth mode; unless otherwise stated.)
CS2842A/CS2843A CS3842A/CS3843A
Characteristic
Error Amp Section
Test Conditions
Min Typ Max Min Typ Max
Input Voltage
Input Bias Current
AVOL
Unity Gain Bandwidth
VCOMP = 2.5 V
VFB = 0
2.0 VOUT 4.0 V
Note 4.
2.45 2.50 2.55 2.42 2.50 2.58
– –0.3 –1.0 – –0.3 –2.0
65 90 – 65 90 –
0.7 1.0 – 0.7 1.0 –
PSRR
Output Sink Current
Output Source Current
VOUT High
VOUT Low
Current Sense Section
12 VCC 25 V
VFB = 2.7 V, VCOMP = 1.1 V
VFB = 2.3 V, VCOMP = 5.0 V
VFB = 2.3 V, RL = 15 kto GND
VFB = 2.7 V, RL = 15 kto VREF
60 70 – 60 70 –
2.0 6.0 – 2.0 6.0 –
–0.5 –0.8 – –0.5 –0.8 –
5.0 6.0 – 5.0 6.0 –
– 0.7 1.1 – 0.7 1.1
Gain
Notes 5 & 6.
2.85 3.00 3.15 2.85 3.00 3.15
Maximum Input Signal
PSRR
Input Bias Current
Delay to Output
Output Section
VCOMP = 5.0 V. Note 5.
12 VCC 25 V. Note 5.
VSENSE = 0
TJ = 25°C. Note 4.
0.9 1.0 1.1 0.9 1.0 1.1
– 70 –
– 70
– –2.0 –10 – –2.0 –10
– 150 300 – 150 300
Output Low Level
ISINK = 20 mA
ISINK = 200 mA
– 0.1 0.4 – 0.1 0.4
– 1.5 2.2 – 1.5 2.2
Output High Level
Rise Time
Fall Time
Total Standby Current
ISOURCE = 20 mA
ISOURCE = 200 mA
TJ = 25°C, CL = 1.0 nF. Note 4.
TJ = 25°C, CL = 1.0 nF. Note 4.
13 13.5
12 13.5
13 13.5
12 13.5
50 150
50 150
50 150
50 150
Startup Current
– – 0.5 1.0 – 0.5 1.0
Operating Supply Current
VCC Zener Voltage
PWM Section
VFB = VSENSE = 0 V,
RT = 10 k, CT = 3.3 nF
ICC = 25 mA
– 11 17 – 11 17
– 34 –
– 34
Maximum Duty Cycle
– 46 48 50 46 48 50
Minimum Duty Cycle
– ––0––0
4. These parameters, although guaranteed, are not 100% tested in production.
5. Parameters measured at trip point of latch with VFB = 0.
6. Gain defined as: A = VCOMP/VSENSE; 0 VSENSE 0.8 V.
*Adjust VCC above the start threshold before setting at 15 V.
Unit
V
µA
dB
MHz
dB
mA
mA
V
V
V/V
V
dB
µA
ns
V
V
V
V
ns
ns
mA
mA
V
%
%
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CS2845 전자부품, 판매, 대치품
CS2844, CS3844, CS2845, CS3845
ORDERING INFORMATION
Device
Temperature Range
CS2844LN8
CS2844LD14
CS2844LDR14
CS2844LDW16
CS2844LDWR16
–25°C to 85°C
CS2845LN8
CS2845LDW16
CS2845LDWR16
CS3844GN8
CS3844GD8
CS3844GDR8
CS3844GD14
CS3844GDR14
CS3844GDW16
CS3844GDWR16
CS3845GN8
0°C to 70°C
CS3845GD8
CS3845GDR8
CS3845GD14
CS3845GDR14
CS3845GDW16
CS3845GDWR16
Package
DIP–8
SO–14
SO–14
SO–16L
SO–16L
DIP–8
SO–16L
SO–16L
DIP–8
SO–8
SO–8
SO–14
SO–14
SO–16
SO–16
DIP–8
SO–8
SO–8
SO–14
SO–14
SO–16L
SO–16L
Shipping
50 Units/Rail
55 Units/Rail
2500 Tape & Reel
48 Units/Rail
2500 Tape & Reel
50 Units/Rail
48 Units/Rail
2500 Tape & Reel
50 Units/Rail
98 Units/Rail
2500 Tape & Reel
55 Units/Rail
2500 Tape & Reel
48 Units/Rail
2500 Tape & Reel
50 Units/Rail
98 Units/Rail
2500 Tape & Reel
55 Units/Rail
2500 Tape & Reel
48 Units/Rail
2500 Tape & Reel
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