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参数资料
| 型号： | TPS59124RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | GREEN, PLASTIC, VQFN-24 |
| 文件页数： | 25/25页 |
| 文件大小： | 846K |
| 代理商： | TPS59124RGET |
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=
W
m
TRIP
V
mV
R
k
10
A
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÷
=
+
=
+
÷
÷
è
è
f
IN
OUT
TRIP
RIPPLE
TRIP
OCL
IN
DS on
V
I
V
1
I
R
2
R
2
L
V
TPS59124
www.ti.com
SLUSA58 – JULY 2010
DETAILED DESCRIPTION (continued)
OUTPUT DISCHARGE CONTROL
TPS59124 discharges the output when ENx is low, or the controller is turned off by the protection functions
(OVP, UVP, UVLO, and thermal shutdown). TPS59124 discharges outputs using an internal, 10-
MOSFET
which is connected to VOx and PGNDx. The external low-side MOSFET is not turned on for the output discharge
operation to avoid the possibility of causing negative voltage at the output. Output discharge time constant is a
function of the output capacitance and the resistance of the internal discharge MOSFET. This discharge ensures
that, on restart, the regulated voltage always starts from zero volts. In case a SMPS is restarted before discharge
completion, discharge is terminated and the switching resumes after the reference level, ramped up by an
internal DAC, comes back to the remaining output voltage.
CURRENT PROTECTION
TPS59124 has cycle-by-cycle over-current limiting control. The inductor current is monitored during the OFF
state and the controller keeps the OFF state during the inductor current is larger than the overcurrent trip level. In
order to provide both good accuracy and cost effective solution, TPS59124 supports temperature compensated
MOSFET RDS(on) sensing. TRIPx pin should be connected to GND through the trip voltage setting resistor, RTRIP.
TRIPx terminal sources 10-mA ITRIP current and the trip level is set to the OCL trip voltage VTRIP as shown in
(2)
The trip level should be in the range of 30 mV to 200 mV over all operational temperatures. The inductor current
is monitored by the voltage between PGNDx pin and LLx pin so that LLx pin should be connected to the drain
terminal of the low-side MOSFET. ITRIP has 4200 ppm/°C temperature slope to compensate the temperature
dependency of the RDS(on). PGNDx is used as the positive current sensing node so that PGNDx should be
connected to the source terminal of the low-side MOSFET. As the comparison is done during the OFF state,
VTRIP sets the valley level of the inductor current. Thus, the load current at over-current threshold, IOCL, can be
calculated as follows;
(3)
In an over-current condition, the current to the load exceeds the current to the output capacitor; thus, the output
voltage tends to fall off (droop). Eventually it crosses the undervoltage protection threshold and shuts down.
OVERVOLTAGE/UNDERVOLTAGE PROTECTION
TPS59124 monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback
voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high and the circuit
latches as the high-side MOSFET driver OFF and the low-side MOSFET driver ON.
Also, the TPS59124 monitors VOx voltage directly and if it becomes greater than 5.75 V, the TPS59124 turns off
the top MOSFET driver, and shuts off both drivers of the other channel.
When the feedback voltage becomes lower than 70% of the target voltage, the UVP comparator output goes
high and an internal UVP delay counter begins counting. After 32 ms, TPS59124 latches OFF both top and
bottom MOSFET drivers, and shuts off both drivers of the other channel. This function is enabled after 1.7 times
soft-start delay time, approximately 2 ms, to ensure start-up properly.
UVLO PROTECTION
TPS59124 has V5FILT undervoltage lock-out protection (UVLO). When the V5FILT voltage is lower than UVLO
threshold voltage, the TPS59124 is shut off. This is non-latch protection.
THERMAL SHUTDOWN
TPS59124 monitors its own temperature. If the temperature exceeds the threshold value (typically 160°C), the
switchers are shut off as both DRVH and DRVL at low; the output discharge function is enabled. TPS59124 is
shut off. This is non-latch protection.
Copyright 2010, Texas Instruments Incorporated
9
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