Datasheet
TPS23753A
www.ti.com
SLVS933B –JULY 2009–REVISED JANUARY 2010
RECOMMENDED OPERATING CONDITIONS
Voltage with respect to V
SS
(unless otherwise noted)
MIN NOM MAX UNIT
Input voltage range, V
DD
, V
DD1
, RTN 0 57 V
Input voltage range, V
C
to RTN 0 18 V
V
I
Input voltage range, APD, CTL to RTN 0 V
B
V
Input voltage range, CS to RTN 0 2 V
RTN current (T
J
≤ 125°C) 350 mA
V
B
sourcing current 0 2.5 5 mA
V
B
capacitance 0.08 0..1 mF
R
BLNK
0 350 kΩ
Synchronization pulse width input (when used) 25 ns
T
J
Operating junction temperature range –40 125 °C
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: CS = APD = CTL = RTN, GATE open, R
FRS
= 60.4 kΩ, R
BLNK
= 249 kΩ, C
VB
= C
VC
= 0.1 mF, R
DEN
=
24.9 kΩ, R
CLS
open, V
VDD-VSS
= 48 V, V
VDD1-RTN
= 48 V, 8.5 V ≤ V
VC-RTN
≤ 18 V, –40°C ≤ T
J
≤ 125°C
Controller Section Only
[V
SS
= RTN and V
DD
= V
DD1
] or [V
SS
= RTN = V
DD
], all voltages referred to RTN. Typical specifications are at 25°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
C
UVLO_1 V
C
rising 8.65 9 9.3
Undervoltage lockout V
UVLO_H Hysteresis
(1)
3.3 3.5 3.7
Operating current V
C
= 12 V, CTL = V
B
0.40 0.58 0.85 mA
V
DD1
= 10.2 V, V
VC
(0) = 0 V 50 85 175
t
ST
Startup time, C
VC
= 22 mF ms
V
DD1
= 35 V, V
VC
(0) = 0 V 30 48 85
V
DD1
= 10.2 V, V
VC
= 8.6 V 0.44 1.06 1.80
Startup current source - I
VC
mA
V
DD1
= 48 V, V
VC
= 0 V 2.5 4.3 6.0
V
B
Voltage 6.5 V ≤ V
C
≤ 18 V, 0 ≤ I
VB
≤ 5 mA 4.75 5.10 5.25 V
FRS
CTL= V
B
, Measure GATE
Switching frequency 223 248 273 kHz
R
FRS
= 60.4 kΩ
78.5
D
MAX
Duty cycle CTL= V
B
, Measure GATE 76% 81%
%
V
SYNC
Synchronization Input threshold 2 2.2 2.4 V
CTL
V
ZDC
0% duty cycle threshold V
CTL
↓ until GATE stops 1.3 1.5 1.7 V
Softstart period Interval from switching start to V
CSMAX
400 800 ms
Input resistance 70 100 145 kΩ
BLNK
In addition to t
1
Blanking delay BLNK = RTN 35 52 75 ns
R
BLNK
= 49.9 kΩ 41 52 63
CS
V
CSMAX
Maximum threshold voltage V
CTL
= V
B
, V
CS
↑ until GATE duty cycle drops 0.50 0.55 0.60 V
t
1
Turn off delay V
CS
= 0.65 V 25 41 60 ns
V
SLOPE
Internal slope compensation voltage Peak voltage at maximum duty cycle, referred to CS 90 118 142 mV
I
SL_EX
Peak slope compensation current V
CTL
= V
B
, I
CS
at maximum duty cycle (ac component) 30 42 54 mA
Bias current (sourcing) Gate high, dc component of CS current 2 3 4.2 mA
(1) The hysteresis tolerance tracks the rising threshold for a given device.
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