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CS3842A 데이터시트 PDF




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부품번호 CS3842A 기능
기능 (CS3842A / CS3843A) Off-Line Current Mode PWM Control Circuit
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CS3842A 데이터시트, 핀배열, 회로
www.DataSheet4U.com
CS2842A, CS3842A,
CS2843A, CS3843A
Off−Line Current Mode
PWM Control Circuit with
Undervoltage Lockout
The CS284XA, CS384XA provides all the necessary features to
implement offline fixed frequency currentmode control with a
minimum number of external components.
The CS384XA family incorporates a new precision
temperaturecontrolled oscillator with an internally trimmed
discharge current to minimize variations in frequency. A precision
dutycycle clamp eliminates the need for an external oscillator when a
50% dutycycle is used. Dutycycles greater than 50% are also
possible. On board logic ensures that VREF is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Other features include low startup current, pulsebypulse current
limiting, and a highcurrent totem pole output for driving capacitive
loads, such as the gate of power MOSFET. The output is LOW in the
off state, consistent with Nchannel devices.
The CS384XA series of currentmode control ICs are available in
8 and14 lead packages for surface mount (SO) applications as well as
8 lead PDIP packages.
Features
Optimized for Offline Control
Internally Trimmed Temperature Compensated Oscillator
Maximum DutyCycle Clamp
VREF Stabilized Before Output Stage is Enabled
Low Startup Current
PulseByPulse Current Limiting
Improved Undervoltage Lockout
Double Pulse Suppression
1.0% Trimmed Bandgap Reference
High Current Totem Pole Output
http://onsemi.com
MARKING
DIAGRAM
8
8
1
8
1
DIP8
N SUFFIX
CASE 626
SO8
D SUFFIX
CASE 751
x84yA
AWL
YYWW
1
8
x84yA
ALYWX
14
1
SO14
D SUFFIX
CASE 751A
1
14
CSx84yA
AWLYWW
1
x = 2 or 3
y = 2 or 3
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 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 4
1
Publication Order Number:
CS2842A/D




CS3842A pdf, 반도체, 판매, 대치품
CS2842A, CS3842A, CS2843A, CS3843A
ELECTRICAL CHARACTERISTICS (continued) (25° ≤ TA 85° for CS2842A/CS2843A, 0° ≤ TA 70° for CS3842A/CS3843A.
VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7);
unless otherwise stated.)
CS2842A/CS2843A CS3842A/CS3843A
Characteristic
Error Amp Section
Test Conditions
Min Typ Max Min Typ Max Unit
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
V
− −0.3 1.0 − −0.3 2.0 μA
65 90 65 90 dB
0.7 1.0 0.7 1.0 MHz
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, 15 kΩ to ground
VFB = 2.7 V, 15 kΩ to 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
dB
mA
mA
V
V
Gain
Notes 5 & 6.
2.85 3.00 3.15 2.85 3.00 3.15 V/V
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
V
dB
μA
ns
Output Low Level
ISINK = 20 mA
ISINK = 200 mA
0.1 0.4 0.1 0.4 V
1.5 2.2 1.5 2.2 V
Output High Level
ISOURCE = 20 mA
ISOURCE = 200 mA
13 13.5
12 13.5
13 13.5
12 13.5
V
V
Rise Time
Fall Time
Output Leakage
Total Standby Current
TJ = 25°C, CL = 1.0 nF (Note 4.)
TJ = 25°C, CL = 1.0 nF (Note 4.)
UVLO Active, VOUT = 0
50 150
50 150 ns
50 150
50 150 ns
− −0.01 10.00 − −0.01 10.00 μA
Startup Current
− − 0.5 1.0 0.5 1.0 mA
Operating Supply Current
VFB = VSENSE = 0 V,
RT = 10 kΩ, CT = 3.3 nF
11 17 11 17 mA
VCC Zener Voltage
ICC = 25 mA
34
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 = ΔVCOMP/ΔVSENSE; 0 VSENSE 0.8 V.
*Adjust VCC above the start threshold before setting at 15 V.
34
V
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CS3842A 전자부품, 판매, 대치품
CS2842A, CS3842A, CS2843A, CS3843A
ǒ Ǔtc + RTCT
ln
VREF * Vlower
VREF * Vupper
ǒ Ǔtd + RTCT
ln
VREF * IdRT * Vlower
VREF * IdRT * Vupper
Substituting in typical values for the parameters in the
above formulas:
VREF = 5.0 V
Vupper = 2.7 V
Vlower = 1.0 V
Id = 8.3 mA
tc 0.5534RTCT
ǒ Ǔtd + RTCT
ln
2.3 * 0.0083RT
4.0 * 0.0083RT
The frequency and maximum duty cycle can be
determined using the Typical Performance Characteristic
graphs.
Grounding
High peak currents associated with capacitive loads
necessitate careful grounding techniques. Timing and
bypass capacitors should be connected close to GND pin in
a single point ground.
The transistor and 5.0 kΩ potentiometer, shown in the test
circuit, are used to sample the oscillator waveform and apply
and adjustable ramp to Sense.
VREF
OSC
GND
Timing Parameters
Vupper
Vlower
tc
Sawtooth Mode
Large RT (10 kΩ)
Triangular Mode
Small RT (700 kΩ)
RT
CT
td
VOSC
Internal Clock
VOSC
Internal Clock
Figure 7. Oscillator Timing Network and
Parameters
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