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TS3843BCS Datasheet

  • TS3843BCS

  • High Performance Current Mode Controller

  • 20頁

  • ETC

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TS3842B/3843B
High Performance Current Mode Controller
Designed for Off-Line and DC-to-DC
converter applications.
DIP-8
SOP-8
General Description
The TS3842B and TS3843B series are high performance fixed frequency current mode controllers.
This is specifically designed for Off-Line and DC-to-DC converter applications offering the designer a
cost effective solution with minimal external components. This integrated circuits feature a trimmed
oscillator for precise duty cycle control, a temperature compensated reference, high gain error
amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving
a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each
with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for
single pulse metering.
This device is available in 8-pin dual-in-line plastic packages as well as the 8-pin plastic surface
mount (SOP-8). The SOP-8 package has separate power and ground pins for the totem pole output
stage.
The TS3842B has UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line converters.
Features
Trimmed Oscillator Discharge Current for
Precise Duty Cycle Control
Current Mode Operation to 500KHz
Automatic Feed Forward Compensation
Latching PWM for Cycle-By-Cycle Current
Limiting
Internally Trimmed Reference with Undervoltage
Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hystersis
Low Start-Up and Operating Current
Block Diagram
V
CC
V
ref
8(14)
R
R
R
T
/C
T
4(7)
Voltage
Feedback
Input
2(3)
Output
Compensation
1(1)
V
ref
Undervoltage
Lockout
5.0V
Reference
7(12)
V
CC
Undervoltage
Lockout
V
C
7(11)
Output
Oscillator
Latching
PWM
+
-
Ordering Information
OPERATING TEMPERATURE
(Ambient)
-20 to +85+
DEVICE
TS3842/3843BCD
TS3842/3843BCS
PACKAGE
DIP-8
SOP-8
6(10)
Power
Ground
5(8)
Current
Sense
3(5)Input
Error
Amplifier
The document contains information on a new product.Specifications and
information herein are subject to change without notice.

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