Datasheet

D
MAX
==
677.0
=
V21
V10V21 +
V
O
VV
IN-MINO
+
21V
=
21V + 70V
= 0.231
D
MIN
=
V
O
+ V
IN-MAX
V
O
533.0467.01D1'D
=
-
=
-
=
D
==
467.0
=
V21
V24V21 +
V
O
VV
INO
+
:
=
:x
=
x
=
95.1m3256rNr
LEDD
V21V5.36VNV
LEDO
=
x
=
x
=
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E –JULY 2008–REVISED MAY 2013 www.ti.com
V
TURN-ON
= 10V
V
HYS
= 3V
V
TURN-OFF
= 40V
V
HYSO
= 10V
1. OPERATING POINT
Solve for V
O
and r
D
:
(95)
(96)
Solve for D, D', D
MAX
, and D
MIN
:
(97)
(98)
(99)
(100)
40 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1