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부품번호 | L6910TR 기능 |
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기능 | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 29 페이지수
L6910
L6910A
ADJUSTABLE STEP DOWN CONTROLLER
WITH SYNCHRONOUS RECTIFICATION
1 FEATURES
■ OPERATING SUPPLY VOLTAGE FROM 5V
TO 12V BUSES
■ UP TO 1.3A GATE CURRENT CAPABILITY
■ ADJUSTABLE OUTPUT VOLTAGE
■ N-INVERTING E/A INPUT AVAILABLE
■ 0.9V ±1.5% VOLTAGE REFERENCE
■ VOLTAGE MODE PWM CONTROL
■ VERY FAST LOAD TRANSIENT RESPONSE
■ 0% TO 100% DUTY CYCLE
■ POWER GOOD OUTPUT
■ OVERVOLTAGE PROTECTION
■ HICCUP OVERCURRENT PROTECTION
■ 200kHz INTERNAL OSCILLATOR
■ OSCILLATOR EXTERNALLY ADJUSTABLE
FROM 50kHz TO 1MHz
■ SOFT START AND INHIBIT
■ PACKAGES: SO-16 & HTSSOP16
2 APPLICATIONS
■ SUPPLY FOR MEMORIES AND TERMI-
NATIONS
■ COMPUTER ADD-ON CARDS
■ LOW VOLTAGE DISTRIBUTED DC-DC
■ MAG-AMP REPLACEMENT
3 DESCRIPTION
The device is a pwm controller for high performance
Figure 2. Block Diagram
PGOOD
VREF
SS
OSC
RT
EAREF
VCC OCSET
MONITOR
PROTECTION
& REF
OSC
E/A
+
-
PWM
-
+
May 2005
D03IN1509
COMP
Figure 1. Packages
SO-16 (Narrow)
HTSSOP16 (Exposed Pad)
Table 1. Order Codes
Part Number
Package
L6910
L6910TR
L6910A
SO-16
SO-16 in Tape & Reel
HTSSOP16
L6910ATR
HTSSOP16 in Tape & Reel
dc-dc conversion from 3.3V, 5V and 12V buses.
The output voltage is adjustable down to 0.9V;
higher voltages can be obtained with an external
voltage divider.
High peak current gate drivers provide for fast switch-
ing to the external power section, and the output
current can be in excess of 20A.
The device assures protections against load overcur-
rent and overvoltage. An internal crowbar is also pro-
vided turning on the low side mosfet as long as the
over-voltage is detected. In case of over-current de-
tection, the soft start capacitor is discharged and the
system works in HICCUP mode.
BOOT
UGATE
BOOT
LGATE
PGND
GND
VFB
Vin 5V to 12V
VO
Rev. 9
1/29
L6910 - L6910A
Table 5. Electrical Characteristics (Vcc = 12V, TJ =25°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min Typ
Vcc SUPPLY CURRENT
Icc Vcc Supply current
OSC = open; SS to GND
47
POWER-ON
Turn-On Vcc threshold
VOCSET = 4V
4.0 4.3
Turn-Off Vcc threshold
VOCSET = 4V
3.8 4.1
Rising VOCSET threshold
1.24
Turn On EAREF threshold
VOCSET = 4V
650
SOFT START AND INHIBIT
Iss Soft start Current
S.S. current in INH condition
SS = 2V
SS = 0 to 0.4V
6 10
35
OSCILLATOR
fOSC Initial Accuracy
OSC = OPEN
OSC = OPEN; Tj = 0° to 125°
180 200
170
fOSC,RT Total Accuracy
16 KΩ < RT to GND < 200 KΩ
-15
∆Vosc Ramp amplitude
1.9
REFERENCE
VOUT Output Voltage Accuracy
VOUT = VFB; VEAREF = VREF
0.886 0.900
VREF Reference Voltage
CREF = 1nF; IREF = 0 to 100µA
0.886 0.900
VREF Reference Voltage
CREF = 1nF; TJ = 0 to 125°C
-2
ERROR AMPLIFIER
IEAREF N.I. bias current
VEAREF = 3V
10
EAREF Input Resistance
Vs. GND
300
IFB I.I. bias current
VFB = 0V to 3V
0.01
VCM Common Mode Voltage
0.8
VCOMP Output Voltage
0.5
GV Open Loop Voltage Gain
70 85
GBWP Gain-Bandwidth Product
10
SR Slew-Rate
COMP = 10pF
10
GATE DRIVERS
IHGATE High Side
Source Current
VBOOT - VPHASE = 12V
VHGATE - VPHASE = 6V
1 1.3
RHGATE High Side
Sink Resistance
VBOOT - VPHASE = 12V
2
ILGATE Low Side Source Current
Vcc = 12V; VLGATE = 6V
0.9 1.1
RLGATE Low Side Sink Resistance
Vcc = 12V
1.5
Output Driver Dead Time
PHASE connected to GND
90
PROTECTIONS
IOCSET OCSET Current Source
VOCSET = 4V
170 200
Over Voltage Trip (VFB / VEAREF) VFB Rising
117
IOSC OSC Sourcing Current
VFB > OVP Trip
15 30
POWER GOOD
Upper Threshold (VFB / VEAREF) VFB Rising
108 110
Lower Threshold (VFB / VEAREF) VFB Falling
88 90
Hysteresis (VFB / VEAREF)
Upper and Lower threshold
2
VPGOOD PGOOD Voltage Low
IPGOOD = -4mA
0.4
IPGOOD Output Leakage Current
VPGOOD = 6V
0.2
Max
9
4.6
4.4
1.4
750
14
60
220
230
15
0.913
0.913
+2
0.5
3
4
4
3
210
230
120
112
92
1
Unit
mA
V
V
V
mV
µA
µA
KHz
kHz
%
V
V
V
%
µA
kΩ
µA
V
V
dB
MHz
V/µs
A
Ω
A
Ω
ns
µA
%
mA
%
%
%
V
µA
4/29
4페이지 L6910 - L6910A
avoided if the PHASE pin is over about 500mV. The lower mos is in any case turned-on after 200ns from the
high side turn-off.
The peak current is shown for both the upper (fig. 6) and the lower (fig. 7) driver at 5V and 12V. A 3.3nF capac-
itive load has been used in these measurements.
For the lower driver, the source peak current is 1.1A @ VCC = 12V and 500mA @ VCC = 5V, and the sink peak
current is 1.3A @ VCC = 12V and 500mA @ VCC = 5V.
Similarly, for the upper driver, the source peak current is 1.3A @ Vboot-Vphase = 12V and 600mA @ Vboot-
Vphase = 5V, and the sink peak current is 1.3A @ Vboot-Vphase =12V and 550mA @ Vboot-Vphase = 5V.
Figure 6. High Side Driver Peak Current. Vboot-Vphase = 12V (right) Vboot-Vphase = 5V (left)
CH1 = High Side Gate CH4 = Gate Current
Figure 7. Low Side Driver Peak Current. VCC = 12V (right) VCC = 5V (left)
CH1 = Low Side Gate CH4 = Gate Current
4.5 Monitoring and Protections
The output voltage is monitored by means of pin FB. If it is not within ±10% (typ.) of the programmed value, the
powergood output is forced low.
The device provides overvoltage protection, when the voltage sensed on pin FB reaches a value 17% (typ.)
greater than the reference the OSC pin is forced high (3V typ.) and the lower driver is turned on as long as the
over-voltage is detected.
7/29
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부품번호 | 상세설명 및 기능 | 제조사 |
L6910TR | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION | STMicroelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |