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UC1825-SP Fiches technique(PDF) 3 Page - Texas Instruments

No de pièce UC1825-SP
Description  RAD-TOLERANT CLASS V, HIGH-SPEED PWM CONTROLLER
Download  18 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC1825-SP Fiches technique(HTML) 3 Page - Texas Instruments

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1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
INV
NI
E/A Out
Clock
RT
CT
Ramp
Soft Start
VREF 5.1 V
VCC
Out B
VC
Pwr Gnd
Out A
Gnd
ILIM/SD
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
Out B
VC
NC
Pwr Gnd
Out A
E/A Out
Clock
NC
RT
CT
UC1825-SP
www.ti.com
SLUS870A – JANUARY 2009 – REVISED MARCH 2012
J PACKAGE
(TOP VIEW)
FK PACKAGE
(TOP VIEW)
TERMINAL FUNCTIONS
NO.
NAME
I/O
DESCRIPTION
J
FK
Clock
4
5
O
Output of the internal oscillator
Timing capacitor connection pin for oscillator frequency programming. The timing capacitor
CT
6
8
I
should be connected to the device ground using minimal trace length.
E/A Out
3
4
O
Output of the error amplifier for compensation
Gnd
10
13
-
Analog ground return pin
ILIM/SD
9
12
I
Input to the current limit comparator and the shutdown comparator
INV
1
2
I
Inverting input to the error amplifier
NC
1, 6, 11, 16
-
No connection
NI
2
3
I
Non-inverting input to the error amplifier
Out A
11
14
O
High-current totem pole output A of the on-chip drive stage
Out B
14
18
O
High-current totem pole output B of the on-chip drive stage
Pwr Gnd
12
15
-
Ground return pin for the output driver stage
Non-inverting input to the PWM comparator with 1.25-V internal input offset. In voltage
Ramp
7
9
I
mode operation this serves as the input voltage feed-forward function by using the CT
ramp. In peak current mode operation, this serves as the slope compensation input.
RT
5
7
I
Timing resistor connection pin for oscillator frequency programming
Soft Start
8
10
I
Soft-start input pin which also doubles as the maximum duty cycle clamp
Power supply pin for the output stage. This pin should be bypassed with a 0.1-
μF
VC
13
17
-
monolithic ceramic low ESL capacitor with minimal trace lengths.
Power supply pin for the device. This pin should be bypassed with a 0.1-
μF monolithic
VCC
15
19
-
ceramic low ESL capacitor with minimal trace lengths.
5.1-V reference. For stability, the reference should be bypassed with a 0.1-
μF monolithic
VREF5.1 V
16
20
O
ceramic low ESL capacitor and minimal trace length to the ground plane.
Copyright © 2009–2012, Texas Instruments Incorporated
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