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参数资料
| 型号： | TPS43000PWRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, TSSOP-16 |
| 文件页数： | 29/31页 |
| 文件大小： | 615K |
| 代理商： | TPS43000PWRG4 |
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TPS43000
SLUS489 OCTOBER 2001
7
www.ti.com
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
BUCK
5
I
Input pin to select topology. Connect this pin to VIN for a buck converter, ground it for a boost or SEPIC.
This configures the logic to the two gate drive outputs, and controls DMAX. This pin has a weak internal
pulldown.
CCM
4
I
Input pin determines whether or not the lZERO comparator allows discontinuous conduction mode opera-
tion. Pulling this pin high ignores the Izero comparator’s output, forcing continuous conduction mode.
Connecting it to ground enables Izero, allowing discontinuous conduction mode (DCM) operation. Note
that even when pulled high, seven detected IZERO pulses still initiate PFM mode. This pin has a weak
internal pull-down.
CCS
2
I
Current limit feature allowing selection of either pulse-by-pulse current limiting or hiccup mode overcur-
rent protection. Connect this pin to VIN to select pulse-by-pulse current limiting, the constant current
source mode. Connect this pin to ground to enable hiccup mode overcurrent protection. This pin has a
weak internal pulldown.
COMP
7
O
Output of the error amplifier. The compensation components are connected from this pin to the FB pin.
During sleep mode, this pin goes to high impedance, and is severed from the internal error amplifier’s
output so that it may hold its dc potential.
FB
8
I
Inverting input to the error amplifier. It is connected to a resistor divider off of VOUT, and to the com-
pensation network.
GND
12
Ground pin for the device.
NDRV
11
O
Gate drive output for the N-channel MOSFET (energizing MOSFET for the boost and SEPIC, rectifier
MOSFET for the buck).
PDRV
13
O
Gate drive output for the P-channel MOSFET (energizing MOSFET for the buck, rectifier MOSFET for the
boost and SEPIC).
PFM
6
I
Input pin that disables/enables PFM operation. Connecting it to VIN disables PFM mode. Grounding this
pin enables PFM to occur automatically, based on lzero. This pin has a weak internal pulldown.
RT
3
O
A resistor from this pin to ground sets the PWM frequency.
SWP
15
I
Connect this pin through a 1-k
resistor to the drain of the P-channel MOSFET for all topologies. It de-
tects Izero pulses using the synchronous rectifier MOSFET. For the SEPIC topology, a Schottky clamp
tied to ground must be connected to this pin.
SWN
16
I
Connect this pin through a 1-k
resistor to the drain of the N-channel MOSFET for all topologies. It
senses overcurrent conditions using the inductor energizing MOSFET.
SYNC/SD
1
I
This dual-function pin is used to synchronize the oscillator or shutdown the controller, turning both
MOSFETs off. A pulse from 0 V to 2 V provides synchronization. Duty cycle is not critical, but it must be
at least 100 ns wide. Holding this pin to 2 V or greater for over 35
s shuts down the device. This pin
has a weak internal pulldown.
VP
14
I
Power rail input pin for the P-channel MOSFET gate driver. Connect this pin to VIN for a buck, and to
VOUT for a boost or SEPIC. Provide good local decoupling.
VIN
9
I
Input supply for the device. It provides power to the device, and may be used for the Nchannel gate
drive. Provide good local decoupling
VOUT
10
O
Connect this pin to the power supply output. It may be used for the gate drive to the Nchannel MOS-
FET. Provide good local decoupling.
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