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B3845A 반도체 회로 부품 판매점

(B3842 - B3845) Current Mode PWM Controller



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B3845A 데이터시트, 핀배열, 회로
www.DataSheet4U.com
Bay Linear
Inspire the Linear Power
Current Mode PWM Controller
B3842/43/44/45A&A1
Description
The Bay Linear B3842/43/44/45 are fixed frequency current-
mode PWM controller. These devices are designed for Off-
Line and DC-to-DC converter applications with minimum
external components. The B3842 family Feature a trimmed
oscillator for precise duty cycle control, a temperature
compensated reference, high gain error amplifier, current
sensing comparator, and a high current totempole output.
Ideally suited for driving a power N-Channel MOSFET’s. It is
low when is on off stage. Protection circuitry includes built in
under-voltage lockout and current limiting.
Major differences between members of these series are the
UVLO thresholds and maximum duty-cycle ranges. Typical
UVLO thresholds of 16V (on) and 10V (off) on the B3842 and
B3844 devices make them ideally suited to off-line
applications. These corresponding typical thresholds for the
B3842 and B3845 devcies are 8.4V (on) and 7.6V (off). The
B3842 and B3843 devcies can operate to duty cycles
approaching 100%. A duty-Cycle range of 0 to 50% is
obtained by the B3844 and B3845 by the addition of an
internal toggle flip-flop, which blanks the output off every
other clock cycle. It id available in 8 pin DIP and SOIC
packages.
Features
Low Start-Up and Operating Current
Maximum Duty Cycle
Operating Frequency Up to 500KHz
Under voltage Lockout with Hysteresis
Available in 8 pin SOIC
Similar to industry Standard UC3842
Applications
Switching Power Supply
Monitor
Pin Connection
8-Pin Surface Mount
COMP
1
8 REF
NC 2
7 VCC
ISENSE
RT/CT
36
45
Top View
OUTPUT
GND
Ordering Information
Devices
B384X(Z)M
B384X(Z)P
Z=A ON Semi
Package
Temp.
SO-8
0 °C to 70 °C
8-DIP
0 °C to 70 °C
Z=A1 Fairchild & Samsung
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com


B3845A 데이터시트, 핀배열, 회로
Absolute Maximum Rating
Parameter
Supply Voltage
Output Current
Analog Input (pin 2,3)
Error Amp Output Sink Current
Power Dissipation
Storage Temperature Range
Lead Temperature (Soldering 10 Sec.)
Symbol
VCC
IO
V(ANA)
ISINK (E.A)
PD
T
TL
Value
30
±1
-0.3 to 6.3
10
1
-65 to 150
260
B384X
Unit
V
A
V
mA
W
°C
°C
Electrical Characteristics
(VCC = 15V;RT = 10, CT = 3.3nF, TA=0 °C to +70°C, unless otherwise specified)
Parameter
Symbol Conditions
MIN
REFERENCE SECTION
Reference Voltage
VREF
TJ = 25 °C. IREF= 1mA
4.90
Line Regulation
REG (line) 12VVCC25V
-
TYP MAX UNIT
5.00 5.10
V
6 20 mA
Load Regulation
REG
(LOAD)
1mAIREF20mA
T= 25 °C
Short Circuit Output
Current
ISC
OSCILLATOR SECTION
Oscillator Frequency
f
Frequency Change with
Voltage
f/VCC
Oscillator Amplitude
VOSC
ERROR AMPLIFIER SECTION
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Power Supply Rejection
Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
IBIAS
VI(E>A)
GVO
PSRR
ISINK
ISOURCE
VOH
VOL
OUTPUT SECTION
Low Output Voltage
VOL
High Output Voltage
VOH
Rise Time
Fall Time
tR
tF
T= 25 °C
T= 25 °C
12VVCC25V
V1 =2.5V
2VVO4V
12VVCC25V
V2 =2.7V, V1 =1.1V
V2=2.3, V1=5V
V2=2.3, RL= 15to GND
V2=2.7, RL= 15to pin 8
ISINK = 20mA
ISINK = 200mA
Source = 20mA
Source = 200mA
TJ = 25 °C, CL=1nF (note3)
TJ = 25 °C, CL=1nF (note3)
Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation
- 6 25
- -100 -180 mA
47 52 57 KHz
- 0.05 1 %
- 1.6 - VP-P
- -0.1 -2 µA
2.42 2.50 2.58
V
65 90
- dB
60 70
- dB
2 7 - mA
-0.6 -1.0 - mA
5 6 -V
- 0.8 1.1 V
- 0.08 0.4 V
1.4 2.2
13 13.5
12 13.0
-
-
V
- 45 150 ns
- 35 150 ns
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com




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