Datasheet


SLVS612 − APRIL 2006
3
www.ti.com
ELECTRICAL CHARACTERISTICS
T
A
= −40°C to 85°C, V
IN
= 12 V
dc
, R
T
= 90.9 kΩ, f
SW
= 500 kHz, V
EA_REF
= 1.25 V, all parameters at zero power dissipation (unless
otherwise noted)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
IN
Input voltage range, VIN 10 40 V
OPERATING CURRENT
I
DD
Quiescent current
Output drivers not switching,
V
FB
= 1.3 V
1.5 3.0 mA
BP5
V
BP5
Ouput voltage I
LOAD
= 1 mA 4.5 5.0 5.5 V
OSCILLATOR/RAMP GENERATOR
f
OSC
Accuracy 9 V ≤ V
IN
≤ 40 V 520 580 640 kHz
V
RAMP
PWM ramp voltage
(1)
V
PEAK
−V
VAL
2.0
V
V
IH
High-level input voltage, SYNC 2 5
V
V
IL
Low-level input voltage, SYNC 0.8 V
I
SYNC
Input current, SYNC 5 10 µA
Pulse width, SYNC 50 ns
V
RT
RT voltage 2.38 2.50 2.58 V
Maximum duty cycle
V
FB
= 0 V, f
SW
≤ 600 kHz 90%
Maximum duty cycle
V
FB
= 0 V, 600 kHz ≤ f
SW
≤ 1 MHz
85%
Minumum duty cycle V
FB
≥ EA_REF + 0.05 V 0%
SOFT START
I
SS
Soft-start source current 1.65 2.35 3.05 µA
V
SS
Soft-start clamp voltage 3.7 V
t
DSCH
Discharge time C
SS
= 220 pF 1.6 2.2 2.8
s
t
SS
Soft-start time C
SS
= 220 pF, 0 V ≤ V
SS
≤ 1.6 V 100 155 205
µs
BP10
V
BP10
Ouput voltage 9.0 9.6 10.3 V
ERROR AMPLIFIER
V
EA_REF
Error amplifier reference input voltage
(1)(2)
10 V ≤ V
IN
≤ 40 V 0.2 2.5 V
Input offset voltage 0.5 V ≤ V
FB
≤ 2.25 V −6 6 mV
Input offset voltage 0.2 V ≤ V
FB
≤ 0.5 V −10 0 10 MV
G
BW
Gain bandwidth 0.2 V ≤ V
FB
≤ 0.5 V 1.5 3.5 MHz
G
BW
Gain bandwidth 0.5 V ≤ V
FB
≤ 2.25 V 2.5 5.0 MHz
A
VOL
Open loop gain 60 80 dB
I
OH
High-level output source current 1.5 4.0
mA
I
OL
Low-level output sink current 2.0 4.0
mA
V
OH
High-level output voltage I
SOURCE
= 500 µA 3.2 3.5
V
V
OL
Low-level output voltage I
SINK
= 500 µA 0.20 0.35
V
I
BIAS
Input bias current V
FB
= 1.2 V 100 200 nA
(1)
Ensured by design. Not production tested.
(2)
Common mode range extends to ground, but not tested below 200 mV.