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L6725ATR Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części L6725ATR
Szczegółowy opis  Voltage mode PWM controller with bootstrap anti-discharging system
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6725ATR Arkusz danych(HTML) 4 Page - STMicroelectronics

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Summary description
L6725 - L6725A
4/32
1
Summary description
The device is a flexible high performance PWM buck controller dedicated for low voltage
distributed DC-DC. The input voltage can range from 1.8V to 18V, while the supply voltage can
range from 4.5V to 18V. The output voltage is adjustable down to 0.6V.
High peak current gate drivers provide for fast switching to the external power section, and the
output current can be in excess of 20A. The device is capable to manage minimum on-times
(TON) shorter than 100ns making possible conversions with very low duty cycle and very high
switching frequency. In order to guarantee a real overcurrent protection, also with very narrow
TON, the current sense is realized both on the high-side and low-side MOSFETs. When
necessary, two different current limit protections can be externally set through an external
resistor. The device can sink current after the soft-start phase while, during the soft-start, the
sink mode capability is disabled in order to allow a proper start-up also in pre-biased output
voltage conditions. Other features are over-voltage-protection and thermal shutdown.
1.1
Functional description
Figure 1.
Block diagram
Vin=1.8V-14V
Vcc=4.5V-14V
L6725
PGND
PHASE
GND
LGATE
BOOT
HGATE
OCH
FB
SS
Monitor
Protection and Ref
OSC
+
-
+
-
E/A
PWM
VCCDR
-
+
-
0.6V
OCL
COMP
EAREF
LDO
PGND
PHASE
GND
LGATE
BOOT
HGATE
OCH
V
OUT
FB
SS
Monitor
Protection and Ref
OSC
+
-
+
-
+
-
E/A
PWM
VCCDR
-
+
-
OCL
COMP
EAREF
LDO
PGOOD
SYNCH
Vcc = 14V - 18V
Vin = 14V - 18V


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