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參數資料
| 型號： | ISL6535CRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Buck Pulse-Width Modulator (PWM) Controller |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, MO-220VGGC, MLFP-16 |
| 文件頁數： | 12/14頁 |
| 文件大?。?/td> | 397K |
| 代理商： | ISL6535CRZ |
12
FN9255.0
January 17, 2006
the switching interval, T
SW
which increases the upper
MOSFET switching losses. Ensure that both MOSFETs are
within their maximum junction temperature at high ambient
temperature by calculating the temperature rise according to
package thermal-resistance specifications. A separate
heatsink may be necessary depending upon MOSFET
power, package type, ambient temperature and air flow.
Standard-gate MOSFETs are normally recommended for
use with the ISL6535. However, logic-level gate MOSFETs
can be used under special circumstances. The input voltage,
upper gate drive level, and the MOSFETs absolute gate-to-
source voltage rating determine whether logic-level
MOSFETs are appropriate.
Figure 9 shows the upper gate drive (BOOT pin) supplied by
a bootstrap circuit from +12V. The boot capacitor, C
BOOT
develops a floating supply voltage referenced to the PHASE
pin. This supply is refreshed each cycle to a voltage of +12V
less the boot diode drop (V
D
) when the lower MOSFET, Q2
turns on. A MOSFET can only be used for Q1 if the
MOSFETs absolute gate-to-source voltage rating exceeds
the maximum voltage applied to +12V. For Q2, a logic-level
MOSFET can be used if its absolute gate-to-source voltage
rating also exceeds the maximum voltage applied to +12V.
Figure 10 shows the upper gate drive supplied by a direct
connection to +12V. This option should only be used in
converter systems where the main input voltage is +5 VDC
or less. The peak upper gate-to-source voltage is
approximately +12V less the input supply. For +5V main
power and +12V DC for the bias, the gate-to-source voltage
of Q1 is 7V. A logic-level MOSFET is a good choice for Q1
and a logic-level MOSFET can be used for Q2 if its absolute
gate-to-source voltage rating exceeds the maximum voltage
applied to PVCC. This method reduces the number of
required external components, but does not provide for
immunity to phase node ringing during turn on and may
result in lower system efficiency.
Schottky Selection
Rectifier D2 is a clamp that catches the negative inductor
swing during the dead time between turning off the lower
MOSFET and turning on the upper MOSFET. The diode must
be a Schottky type to prevent the lossy parasitic MOSFET
body diode from conducting. It is acceptable to omit the diode
and let the body diode of the lower MOSFET clamp the
negative inductor swing, but efficiency could slightly decrease
as a result. The diode's rated reverse breakdown voltage
must be greater than the maximum input voltage.
P
UPPER
= I
O2
x r
DS(ON)
x D +1
2Io x V
IN
x T
SW
x Fs
P
LOWER
= I
O2
x r
DS(ON)
x (1 - D)
where: D is the duty cycle = V
O
/ V
IN
,
T
SW
is the switching interval, and
Fs is the switching frequency.
+12V
PGND
ISL6535
GND
LGATE
UGATE
BOOT
+1.2V TO +12V
FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION
NOTE:
V
G-S
≈
V
CC
- V
D
NOTE:
V
G-S
≈
PVCC
C
BOOT
D
BOOT
Q1
Q2
PVCC +12V
D2
+
-
V
D
+
-
PHASE
+12V
PGND
LGATE
UGATE
BOOT
+5V OR LESS
FIGURE 10. UPPER GATE DRIVE - DIRECT V
CC
DRIVE OPTION
NOTE:
V
G-S
≈
V
CC
- 5V
NOTE:
V
G-S
≈
PVCC
Q1
Q2
PVCC +12V
D2
ISL6535
GND
+
-
ISL6535
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| ISL6535CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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| ISL6535IBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6535IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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