MAX8791GTA 查看數據表（PDF） - Maxim Integrated

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MAX8791GTA

Single-Phase, Synchronous MOSFET Drivers

Maxim Integrated 

Single-Phase, Synchronous MOSFET Drivers

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VDD = 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.)

VPWM

VDL

VLX

SWITCHING WAVEFORMS

(PWM = MID TO LOW TO MID)

MAX8791 toc11

5V

5V/div

0

5V

5V/div

0

0

10V/div

0

VDH

10V/div

VPWM

VDL

VLX

VDH

SWITCHING WAVEFORMS

(PWM = HIGH TO MID TO HIGH)

MAX8791 toc12

5V

5V/div

0

0

5V/div

10V

10V/div

0

15V

10V/div

0

Pin Description

PIN NAME

FUNCTION

1

BST Boost Flying-Capacitor Connection. Gate-drive power supply for DH high-side gate driver. Connect a 0.1µF or

0.22µF capacitor between BST and LX.

PWM Input Pin. Noninverting DH control input from the controller IC:

Logic high: DH = high (BST), DL = low (PGND).

2

PWM

Midlevel: After the midlevel hold time expires, the controller enters standby mode. DH and DL pulled low.

Logic low: DH = low (LX), DL = high (VDD) when SKIP = high.

Internal pullup and pulldown resistors create the midlevel and prevent the controller from triggering an on-time if

this input is left unconnected (not soldered properly) or driven by a high impedance.

3

GND Power Ground for the DL Gate Drivers and Analog Ground. Connect exposed pad to GND.

4

DL PWM Low-Side Gate-Driver Output. Swings between GND and VDD. DL forced high in shutdown.

5

VDD

Supply Voltage Input for the DL Gate Drivers. Connect to 4.2V to 5.5V supply and bypass to GND with a 1µF

ceramic capacitor.

Pulse-Skipping Mode Pin. Enable pulse-skipping mode (zero-crossing comparator enabled) when the driver is

operating in SKIP mode:

6

SKIP

SKIP = VDD PWM mode

SKIP = GND SKIP mode

An internal pulldown current pulls the controller into the low-power pulse-skipping state if this input is left

unconnected (not soldered properly) or driven by a high impedance.

7

LX Switching Node and Inductor Connection. Low-power supply for the DH high-side gate driver. LX connects to

the skip-mode zero-crossing comparator.

8

DH External High-Side nMOSFET Gate-Driver Output. Swings between LX and BST.

—

EP Exposed Pad. Connect to ground through multiple vias to reduce the thermal impedance.

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