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参数资料
| 型号： | NCP4331DBR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-TSSOP |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 400kHz |
| 电源电压： | 最高 30V |
| 降压： | 是 |
| 升压： | 无 |
| 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 ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
NCP4331
VIN_FORWARD
V in
V out1
+
LOAD1
Regulation
Block
VCC
Forward
Driver
(e.g.
NCP1280)
CSin-
1 CSout
2 CSin-
VCC 16
BST 15
CSin-
C1
CSin+
R th0
V out1
3 CSin+
HS_ DRV 14
R1
R2
CSin+
FB
4 UVP
5 COMP
6 FB
HB 13
VDD 12
LS_ DRV 11
L
R S
(Coil Series Res‐
istor) + LOAD2
V out2
7 SS
GND 10
R sync
8 Cramp
SYNC
9
FB
Figure 27. Post-Regulation with CCCV Protection
In Figure 27, the series resistor R S of the inductor senses the coil current. Practically if the resistors R 1 and R 2 are equal and
if R th0 is high compared to them, the inductor voltage is integrated by the auxiliary OPAMP. Since the average voltage across
the pure inductive part of the coil is zero in steady state, this sensing technique actually returns the averaged voltage across
the series resistor R S (”V RS ”). V RS is compared to an offset created using the main output voltage (“V out1 ”) together with of
the R2 and Rth0 resistors (more specifically, this offset is [(R2/(R2 + R th0 )) ? V out1 ]). Finally, the coil maximum current is given
by: (I coil )max = (R2/(R2 + R th0 )) ? V out1 /R S ). Any accurate voltage source could be used instead of V out1 . This technique that
limits the coil current as a function of the main output V out1 , further performs some soft-start function and helps V out2 track
V out1 .
http://onsemi.com
19
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