TL594_15 Datasheet, PDF (1/23 Pages) Unisonic Technologies – PULSE-WIDTH-MODULATION CONTROL CIRCUIT

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TL594
SLVS052H – APRIL 1988 – REVISED JANUARY 2014
TL594 Pulse-Width-Modulation Control Circuit
Check for Samples: TL594
FEATURES
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• Complete PWM Power-Control Circuitry
• Uncommitted Outputs for 200-mA Sink or
Source Current
• Output Control Selects Single-Ended or
Push-Pull Operation
• Internal Circuitry Prohibits Double Pulse
at Either Output
• Variable Dead Time Provides Control Over
Total Range
• Internal Regulator Provides a Stable 5-V
Reference Supply Trimmed to 1%
• Circuit Architecture Allows Easy
Synchronization
• Undervoltage Lockout for Low-V_CC Conditions
DESCRIPTION
The TL594 device incorporates all the functions
required in the construction of a pulse-width-
modulation (PWM) control circuit on a single chip.
Designed primarily for power-supply control, this
device offers the systems engineer the flexibility to
tailor the power-supply control circuitry to a specific
application.
The TL594 device contains two error amplifiers, an
on-chip adjustable oscillator, a dead-time control
(DTC) comparator, a pulse-steering control flip-flop, a
5-V regulator with a precision of 1%, an undervoltage
lockout control circuit, and output control circuitry.
The error amplifiers have a common-mode voltage
range of –0.3 V to V_CC – 2 V. The DTC comparator
has a fixed offset that provides approximately 5%
dead time. The on-chip oscillator can be bypassed by
terminating RT to the reference output and providing
a sawtooth input to CT, or it can be used to drive the
common circuitry in synchronous multiple-rail power
supplies.
The uncommitted output transistors provide either
common-emitter or emitter-follower output capability.
Each device provides for push-pull or single-ended
output operation, with selection by means of the
output-control function. The architecture of these
devices prohibits the possibility of either output being
pulsed twice during push-pull operation. The
undervoltage lockout control circuit locks the outputs
off until the internal circuitry is operational.
The TL594C device is characterized for operation
from 0°C to 70°C. The TL594I device is characterized
for operation from –40°C to 85°C.
D, N, NS, OR PW PACKAGE
(TOP VIEW)
1IN+ ₁
1IN- ₂
FEEDBACK ₃
DTC 4
CT 5
RT 6
GND 7
C1 8
16 ^2IN+
15 ^2IN-
14 ^REF
13 OUTPUT CTRL
12 VCC
11 C2
10 E2
9 E1
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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 © 1988–2014, Texas Instruments Incorporated