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TPS40090RHDRG4 Fiches technique(PDF) 6 Page - Texas Instruments

No de pièce TPS40090RHDRG4
Description  HIGH-FREQUENCY, MULTIPHASE CONTROLLER
Download  31 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40090RHDRG4 Fiches technique(HTML) 6 Page - Texas Instruments

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TPS40090
TPS40091
SLUS578B
– OCTOBER 2003 – REVISED MAY 2006
www.ti.com
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
RHD
PW
Output of an internal 5V regulator. A 4.7-
μF capacitor should be connected from this pin to ground. For 5V applications,
BP5
22
22
O
this pin should be connected to VDD.
COMP
7
9
O
Output of the error amplifier. The voltage at this pin determines the duty cycle for the PWM.
CS1
27
1
I
Used to sense the inductor current in the phases. Inductor current can be sensed with an external current sense
CS2
28
2
I
resistor or by using an external circuit and the inductor
's DC resistance. They are also used for overcurrent protection
CS3
1
3
I
and forced current sharing between the phases.
CS4
2
4
I
CSCN
3
5
I
Common point of current sense resistors or filter inductors
Output of the differential amplifier. The voltage at this pin represents the true output voltage without drops that result
DIFFO
9
11
O
from high current in the PCB traces
DROOP
5
7
I
Used to program droop function. A resistor between this pin and the REF pin sets the desired droop value.
A logic high signal on this input enables the controller operation. A pulsing signal to this pin synchronizes the main
EN/SYNC
24
24
I
oscillator to the rising edge of an external clock source. These pulses must be of higher frequency than the free
running frequency of the main oscillator set by the resistor from the RT pin.
Inverting input of the error amplifier. In closed loop operation, the voltage at this pin is the internal reference level of
FB
8
10
I
700 mV. This pin is also used for the PGOOD and OVP comparators.
GND
17
17
Ground connection to the device.
GNDS
12
13
I
Inverting input of the differential amplifier. This pin should be connected to ground at the point of load.
Used to set the cycle-by-cycle current limit threshold. If ILIM threshold is reached, the PWM cycle is terminated and the
converter delivers limited current to the output. Under these conditions the undervoltage threshold is reached
ILIM
4
6
I
eventually and the controller enters the hiccup mode. The controller stays in hiccup mode for seven consecutive cycles.
At the eighth cycle the controller attempts a full start-up sequence.
PGOOD
13
14
O
Power good indicator of the output voltage. This open-drain output connects to the supply via an external resistor.
PWM1
21
21
O
Phase shifted PWM outputs which control the external drivers. The high output signal commands a PWM cycle. The
PWM2
20
20
O
low output signal commands controlled conduction of the synchronous rectifiers. These pins are also used to program
various operating modes as follows: for three-phase mode, PWM4 is connected to 5 V; for two-phase mode, PWM2
PWM3
19
19
O
and PWM4 are connected to 5 V.
PWM4
18
18
O
REF
6
8
O
Output of an internal 0.7-V reference voltage.
RT
16
16
I
Connecting a resistor from this pin to ground sets the oscillator frequency.
VIN
23
23
I
Power input for the chip. De-coupling of this pin is required.
VOUT
10
12
I
Noninverting input of the differential amplifier. This pin should be connected to VOUT at the point of load.
SS
15
15
I
Provides user programmable soft-start by means of a capacitor connected to the pin.
11, 14,
NC
-
-
No connect pins
25, 26
6
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Copyright
© 2003–2006, Texas Instruments Incorporated
Product Folder Link(s): TPS40090 TPS40091


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