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GND
REF
V
CC
Reference
Regulator
C1
Pulse-Steering
Flip-Flop
C1
1D
FEEDBACK
DTC
CT
RT
PWM
Comparator
Error Amplifier 2
1
+
-
Error Amplifier 1
≈0.1 V
DTC
Comparator
Oscillator
OUTPUT CTRL
(see Function Table)
0.7 mA
E1
C2
E2
2
+
-
Undervoltage
Lockout
Control
IN+
IN-
IN+
IN-
6
5
1
2
16
15
3
14
7
12
10
11
9
8
13
4
TL594
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS052G – APRIL 1988 – REVISED JANUARY 2007
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
PDIP – N Tube of 25 TL594CN TL594CN
Tube of 40 TL594CD
SOIC – D TL594C
Reel of 2500 TL594CDR
0 ° C to 70 ° C
SOP – NS Reel of 2000 TL594CNSR TL594
Tube of 90 TL594CPW
TSSOP – PW T594
Reel of 2000 TL594CPWR
PDIP – N Tube of 25 TL594IN TL594IN
Tube of 40 TL594ID
SOIC – D TL594I
Reel of 2500 TL594IDR
–40 ° C to 85 ° C
SOP – NS Reel of 2000 TL594INSR TL594I
Tube of 90 TL594IPW
TSSOP – PW Z594
Reel of 2000 TL594IPWR
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
INPUT
OUTPUT FUNCTION
OUTPUT CTRL
V
I
= 0 Single-ended or parallel output
V
I
= V
ref
Normal push-pull operation
FUNCTIONAL BLOCK DIAGRAM
2
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