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UC1825A-SP Datenblatt(PDF) 4 Page - Texas Instruments

Teilenummer UC1825A-SP
Bauteilbeschribung  Rad-Tolerant Class-V, High-Speed PWM Controller
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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UC1825A-SP Datenblatt(HTML) 4 Page - Texas Instruments

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16
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10
9
INV
NI
EAOUT
CLK/LEB
RT
CT
RAMP
SS
VREF
VCC
OUTB
VC
PGND
OUTA
GND
ILIM
UC1825A-SP
SLUS873B – JANUARY 2009 – REVISED OCTOBER 2015
www.ti.com
6 Pin Configuration and Functions
J Package
16-Pin CDIP
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
NO.
CLK/LEB
4
O
Output of the internal oscillator
Timing capacitor connection pin for oscillator frequency programming. The timing capacitor must be
CT
6
I
connected to the device ground using minimal trace length.
EAOUT
3
O
Output of the error amplifier for compensation
GND
10
Analog ground return pin
ILIM
9
I
Input to the current limit comparator
INV
1
I
Inverting input to the error amplifier
NI
2
I
noninverting input to the error amplifier
OUTA
11
O
High current totem pole output A of the on-chip drive stage
OUTB
14
O
High current totem pole output B of the on-chip drive stage
PGND
12
Ground return pin for the output driver stage
Noninverting input to the PWM comparator with 1.25-V internal input offset. In voltage mode operation,
RAMP
7
I
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
I
Timing resistor connection pin for oscillator frequency programming
SS
8
I
Soft-start input pin that also doubles as the maximum duty cycle clamp
Power supply pin for the output stage. This pin must be bypassed with a 0.1-
μF monolithic ceramic low
VC
13
ESL capacitor with minimal trace lengths.
Power supply pin for the device. This pin must be bypassed with a 0.1-
μF monolithic ceramic low ESL
VCC
15
capacitor with minimal trace lengths
5.1-V reference. For stability, the reference must be bypassed with a 0.1-
μF monolithic ceramic low ESL
VREF
16
O
capacitor and minimal trace length to the ground plane.
4
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