UCC2808A-1Q1_15 Datasheet, PDF (1/17 Pages) Texas Instruments – Low Power Current Mode Push-Pull PWM

UCC2808A-1Q1
UCC2808A-2Q1
www.ti.com
SGLS183B – AUGUST 2003 – REVISED JULY 2012
Low Power Current Mode Push-Pull PWM
Check for Samples: UCC2808A-1Q1 , UCC2808A-2Q1
FEATURES
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• Qualified for Automotive Applications
• ESD Protection Exceeds 1500 V Per MIL-STD-
883, Method 3015; Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
• Dual Output Drive Stages in Push-Pull
Configuration
• Current Sense Discharge Transistor to
Improve Dynamic Response
• 130-μA Typical Starting Current
• 1-mA Typical Run Current
• Operation to 1 MHz
• Internal Soft Start
• On-Chip Error Amplifier With 2-MHz Gain
Bandwidth Product
• On Chip V_DD Clamping
• Output Drive Stages Capable of 500-mA Peak-
Source Current, 1-A Peak-Sink Current
D PACKAGE
(TOP VIEW)
COMP ¹
FB 2
CS 3
RC ₄
8 VDD
7 OUTA
6 ^OUTB
5 ^GND
OUTA
VDD
COMP
FB
PW PACKAGE
(TOP VIEW)
1
8
2
7
3
6
4
5
OUTB
GND
RC
CS
DESCRIPTION
The UCC2808A-xQ1 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The
UCC2808A-xQ1 contains all of the control and drive circuitry required for off-line or DC-to-DC fixed frequency
current-mode switching power supplies with minimal external parts count.
The UCC2808A-xQ1 dual output drive stages are arranged in a push-pull configuration. Both outputs switch at
half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to
200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle
to less than 50%.
The UCC2808A-xQ1 family offers a variety of package options and choice of undervoltage lockout levels. The
family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are
shown in the ordering information table.
The UCC2808A-xQ1 is an enhanced version of the UCC2808 family. The significant difference is that the A
versions feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle
during the oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle
and helps minimize filter capacitor values and current sense delay.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2012, Texas Instruments Incorporated