TC28C43EOE TELCOM [TelCom Semiconductor, Inc], TC28C43EOE Datasheet - Page 3

• Manufacturer Part Number: TC28C43EOE
• Description: BiCMOS CURRENT MODE PWM CONTROLLERS
• Manufacturer: TELCOM [TelCom Semiconductor, Inc]

NOTES: 1. These parameters, although guaranteed over the
BiCMOS CURRENT MODE
PWM CONTROLLERS
ELECTRICAL CHARACTERISTICS (Cont):
temperature range. V
Parameter
Output Section
R
R
Rise Time
Fall Time
Cross Conduction
V
Undervoltage Lockout Section
Start Threshold
Undervoltage Threshold
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Supply Current
Start Up
Operating
TelCom Semiconductor reserves the right to make changes in the circuitry or specifications detailed in this manual at any time without notice. Minimums
and maximums are guaranteed. All other specifications are intended as guidelines only. TelCom Semiconductor assumes no responsibility for the use of
any circuits described herein and makes no representations that they are free from patent infringement.
*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above
those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of
the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute
Maximum Rating Conditions for extended periods may affect device reliability.
PIN DESCRIPTION
DS (ON)
DS (ON)
Pin No.
8-Pin
DD
Ma
1
2
3
4
TELCOM SEMICONDUCTOR, INC.
2. Parameter measured at trip point of latch.
3. Gain ratio is defined as:
recommended operating conditions, are not tested in
production.
V(I
V
Pin No
14-Pin
COMP
SENSE
2
4
1
3
5
7
)
IN
Pin No
= V
16-Pin
Test Conditions
I
I
C
C
In Coulombs (Note 1)
Note 1
x8C43
x8C43
x8C43 (Note 1)
T
SINK
SOURCE
V
A
L
L
1
2
3
4
5
6
FB
DD
= 25 C, V
= 1nF (Note 1)
= 1nF (Note 1)
= V(I
= 20mA
= 15V; R
= 20mA
SENSE
Symbol
IN
CMPTR
I
R
SENSE
T
< V
) = 0V; Figure 4
V
NC
NC
T
= 71 k ; C
FB
/C
UV
T
; Figure 1
T
= 150 pF.
Description
No Connection
No Connection
Compensation of the feedback loop response.
Feedback of voltage to error amplifier to regulate voltage.
For sensing pass transistor current and terminate drive when current
limit threshold is reached at this pin.
Capacitor and resistor input to set oscillator frequency of this PWM
controller. The resistor is connected from V
The capacitor is connected from R
unless otherwise stated, these specifications apply over specified
Min
7.9
7.2
95
50
—
—
—
—
—
—
4. Output frequency equals oscillator frequency for the
5. PSRR of V
TC18C4X
TC28C4X
where 0
x8C43.
combination.
Typ
170
6.5
8.4
7.6
11
40
30
97
—
7
1
V(I
REF
100
300
Max
8.8
7.9
15
20
60
60
18
—
0
2
SENSE
, Error Amp and PWM Comparator
T
)
/C
Min
T
0.8V
7.9
7.2
95
50
—
—
—
—
—
—
to ANALOG GND.
REF
TC38C4X
Typ
170
6.5
8.4
7.6
11
35
30
—
97
output to R
7
1
Max
300
100
8.8
7.9
1.5
15
15
60
40
18
—
0
TC18C43
TC28C43
TC38C43
T
/C
T.
nsec
nsec
Units
mA
nC
%
%
V
V
V
A
4-95
1
2
3
4
5
6
7
8