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TD3844A Datasheet Preview

TD3844A Datasheet

(TD3842A - TD3845A) High Performance Current Mode PWM Controllers

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TD3842A / 3843A / 3844A / 3845A
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
DESCRIPTION
The TD3842A / 3843A/384 4A/3845A are fixed frequency current-mode
PWM controller. They are specially designed for Off - Line and DC-to-DC
converter applications with minimum external components.
These 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 totempole output Ideally
suited for driving a power MOSFET. Protection circuity Includes built in
under-voltage lockout and current limiting. The TD3842A and TD3844A
have UVLO thresholds of 16V (on) and 10V (off) The TD3843A and
TD3845A are 8.4V (on) and 7.6V (off) The TD3842A and TD3843A
can operate within 100% duty cycle.The TD3844A and TD3845A can
operate with 50% duty cycle.
FEATURES
• Low Start Up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency Up To 500KHz
BLOCK DIAGRAM
SOP-8
DIP-8
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DataShee
Note 1: Toggle flip flop us ed only in 3844A and 3845A.
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8
7
6
5
Top View
Vref
VCC
Output
Gnd
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TMC

TD3844A Datasheet Preview

TD3844A Datasheet

(TD3842A - TD3845A) High Performance Current Mode PWM Controllers

No Preview Available !

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TD3842A / 3843A / 3844A / 3845A
MA XIMUM R AT ING S
R ating
B ias and Driver Voltages (Zero S eries Impedance, s ee als o Total Device s pec)
Total P ower S upply and Zener C urrent
Output C urrent, S ource or S ink (Note 1)
Output E nergy (C apacitive Load per C ycle)
C urrent S ens e and Voltage F eedback Inputs
E rror Amp Output S ink C urrent
P ower Dis s ipation and T hermal C haracteris tics
D S uffix, P las tic P ackage
Maximum P ower Dis s ipation @ TA = 25°C
T hermal R es is tance, J unction-to-Air
N S uffix, P las tic P ackage
Maximum P ower Dis s ipation @ TA = 25°C
T hermal R es is tance, J unction-to-Air
Operating J unction Temperature
Operating Ambient Temperature
S torage Temperature R ange
1. Maximum P ackage power dis s ipation limits mus t be obs erved.
S ymbol
VCC, VC
(ICC + IZ)
IO
W
V in
IO
Value
30
30
1.0
5.0
- 0.3 to + 5.5
10
Unit
V
mA
A
µJ
V
mA
PD
R θJ A
PD
R θJ A
TJ
TA
Ts tg
862
145
1.25
100
+ 150
0 to + 70
- 65 to + 150
mW
°C /W
W
°C /W
°C
°C
°C
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E L E C T R IC A L C HA R A C T E R IS T IC S (V C C = 15 V, [Note 2], R T = 10 k, C T = 3.3 nF, TA = T low to T high [Note 3], unles s otherwis e noted.)
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C harac teris tic s
S ymbol
R E FE R E NC E S E C TION
R eference Output Voltage (IO = 1.0 mA, T J = 25°C )
Line R egulation (V C C = 12 V to 25 V )
Load R egulation (IO = 1.0 mA to 20 mA)
Temperature S tability
Total Output Variation over Line, Load, Temperature
Output Nois e Voltage (f = 10 Hz to 10 kHz,
T J = 25°C )
Long Term S tability (TA = 125°C for 1000 Hours )
Output S hort C ircuit C urrent
OS C IL L ATOR S E C TION
F requency
T J = 25°C
TA = T low to T high
F requency C hange with Voltage (VC C = 12 V to 25 V)
F requency C hange with Temperature
TA = T low to T high
Os cillator Voltage S wing (P eak±to±P eak)
Dis charge C urrent (Vosc = 2.0 V )
T J = 25°C
TA = T low to T high
V re f
R egline
R egload
TS
V re f
Vn
S
IS C
fos c
fos c/V
fos c/T
V os c
Idis chg
TD3842A /43A /44A /45A
Min Typ Max
Unit
4.9 5.0 5.1
V
- 2.0 20 mV
- 3.0 25 mV
- 0.2 - mV /°C
4.82 -
5.18 V
- 50 - µV
- 5.0 - mV
- 30 - 85 - 180 mA
kHz
47 52 57
46 -
60
-
0.2 1.0
%
- 5.0 -
%
- 1.6 -
V
mA
7.5 8.4 9.3
7.2 -
9.5
DataShee
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Part Number TD3844A
Description (TD3842A - TD3845A) High Performance Current Mode PWM Controllers
Maker TMC
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