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参数资料
| 型号： | FAN1577AMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 20-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 372kHz |
| 占空比： | 95% |
| 电源电压： | 10 V ~ 15 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | FAN1577AMXDKR |
Pin Configuration & Marking Information
20
F: Fairchild Logo
TAHAA
FAN1577AM
T: Assembly Plant Code
A: Year Code
H: Week Code
AA: Die Run Code
1
Figure 3.
Marking Diagram
Figure 4.
Marking Legend
Figure 5.
Pin Assignments
(Top View)
Pin Definitions
Name
RT
IN1
COMP1
SS1/ENB
CLP1
BST1
Pin #
1
2
3
4
5
6
Type
Frequency
Select
Feedback
Compensation
Soft-Start /
Enable
Over-Current
Protection
Boost Supply
Description
An external resistor connecting this pin to GND can program the switching
frequency. The switching frequency is 61kHz when RT is open and becomes
340kHz when RT is shorted to ground.
Inverting input of the error amplifier normally connected to the switching power
supply output through a resistor divider.
Output of the error amplifier and input to the PWM comparator. It is used for
feedback-loop compensation.
A 35/15μA internal current source charging an external capacitor for soft-start.
Pull down this pin and pin 17 to disable the chip.
Over-current protection for high-side MOSFET. Connect a resistor from this pin
to the high-side supply voltage to program the OCP level.
Supply for high-side driver. Connect to the internal bootstrap circuit.
DH1
7
High-Side Drive Channel 1, high-side MOSFET gate driver pin.
CLN1
8
Switch Node
Switch-node connection to the inductor. For channel 1, high-side driver’s
reference ground.
DL1
9
Low-Side Drive Low-side MOSFET gate driver pin.
PGND
VCC
10
11
Driver Ground
Power Supply
Driver circuit reference. Connect to low-side MOSFET GND.
Supply voltage input.
DL2
12
Low-Side Drive Low-side MOSFET gate driver pin.
CLN2
13
Switch Node
Switch-node connection to the inductor. For channel 2, high-side driver’s
reference ground.
DH2
14
High-Side Drive Channel 2 high-side MOSFET gate driver pin.
BST2
CLP2
SS2/ENB
COMP2
IN2
15
16
17
18
19
Boost Supply
Over-Current
Protection
Soft-Start /
Enable
Compensation
Feedback
Supply for high-side driver. Connect to the internal bootstrap circuit.
Over-current protection for the high-side MOSFET. Connect a resistor from this
pin to the high-side supply voltage to program the OCP level.
A 35/15μA internal current source charging an external capacitor for soft-start.
Pull down this pin and pin 4 to disable the chip.
Output of the error amplifier and input to the PWM comparator. It is used for
feedback-loop compensation.
Inverting input of the error amplifier. It is normally connected to the switching
power supply output through a resistor divider.
GND
20
Analog Ground The reference of internal control circuits.
? 2010 Fairchild Semiconductor Corporation
FAN1577A ? Rev. 1.0.0
3
www.fairchildsemi.com
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