TPS2346
SLUS529 MAY 2002
21
www.ti.com
APPLICATION INFORMATION
UDG02005
t1: Slow turn-on period
t2: Linear current ramp (di/dt)
t3: Constant-current load charging
t
CHG
: IRAMP capacitor charge time, (1.4 ?/SPAN> C
IRAMP
/58)
t1
t2
t3
0 V
V
IN
0 A
I
IMAX
0 V
0 V
1.5 V
TIME
IRAMP
VOLTAGE
GATE
VOLTAGE
LOAD
CURRENT
BACKEND
VOLTAGE
t
CHG
32 x t
CHG
Figure 20. Load Current at Startup
Once the slow ramp period has expired, the clamp is removed, and the IRAMP voltage continues to ramp up
at a constant rate of:
I
O
C
IRAMP
+
58 mA
C
IRAMP
Since the linear amplifier acts to maintain equal voltages at its inputs (see Figure 2), it slews the GATEx output
such that the CSx voltage tracks the internally generated reference at its inverting input. Therefore, the linear
voltage ramp at the IRAMP pin results in a linear current ramp to the three positive loads.
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